Lattice beam technical manual - Metsec Lattice Beams...
Transcript of Lattice beam technical manual - Metsec Lattice Beams...
CI/SfB (28) Hh2
January 2016 1
Lattice beam technical manual
Joists, trusses and complete frame installation service
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Contents
MLB : Investing in quality and service 3-4
Installation 5
Product range 6-10
Features and benefits 6-7
Product range Heavy duty range
8-9 10
Roof beams 11-18
Metal roof systems 11-12
Traditional roof systems 13
Green roof systems 14
Complete lightweight systems 15
Over-roof systems 16
Eaves cantilever systems 17-18
Ceiling and service supports 19-20
Ceiling and service support systems 19
Walk on ceiling systems 20
Floor beams 21-22
Traditional floor systems 21
Mezzanine floor systems 22
Fixing details 23-26
Typical fixing details 23-26
Chord and bridging details 27-28
Chord details 27
Bridging details 28
Design examples and load tables 29-35
Design examples 29-32
Load tables - Parallel beams 33-35
Services and design software 36-37
Services and general notes 36 Software 37
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Quality and service Quality and service
Investing in quality and service
Metsec plc
Metsec plc is the UK’s largest specialist cold
roll-forming company, providing structural steel
components for the UK construction and
manufacturing industries. We have been
established for over 75 years and are based in
Oldbury in the West Midlands.
Today, Metsec are part of the Profilform Division
of voestalpine - the world’s largest manufacturer
of cold roll-formed sections, with a global network
producing over 800,000 tonnes of cold rolled steel
per annum.
We focus on adding value through expert design,
precision manufacturing and on-time, in-full
product delivery. Our aim is to provide excellent
service and quality products that offer our
customers cost effective solutions.
Please Note
As of April 2012, Metsec Lattice
Beams Ltd are no longer part of the
Metsec plc group. We are now an
independent trading company.
Metsec Lattice Beams
Lightweight steel lattice beams were first
introduced by Metsec in the 1950’s and their
inherent advantages very quickly established the
product as the first choice for structurally sound,
cost effective construction.
Since this introduction, the Metsec policy of
continual research and development has ensured
that quality and technical properties have
improved over the years and availability of type
has increased in parallel with development in
building technology and architectural styles.
Metsec Lattice Beams Ltd offer a wide range of joist
and truss solutions pre-engineered off site. We can
achieve spans of up to 40m and all of our designs
give optimal levels of structural performance in
roof, floor or any other application where light
weight and long span performance is important.
All sections are designed in accordance with BS
5950-5:1998.
Quality
MLB operates strict design and quality
procedures through a Quality Management
System which covers both our design and
manufacturing operations.
This commitment to quality ensures that we
provide the highest levels of performance
throughout our operations, ensuring the highest
level of customer satisfaction.
Design
Our market-leading LatticeSPEC design software
provides cost effective solutions to maximise the
design efficiency of structures. Comprehensive
technical support is provided by our design office.
The latest version of LatticeSPEC offers the unique
advantage of producing complete profiles/sections
of joists and trusses in .dxf format, saving the professional
team valuable time when specifying our products.
For full details on our technical support service
and how to obtain a free copy of LatticeSPEC
please refer to page 39.
Re-use and recycling
Steel is one of the World’s most recycled materials. According to the British Constructional Steelwork Association (BCSA), recovery rates for steel components from building demolition sites are 84% for recycling and 10% for re-use*. This gives a total potential recovery and re-use factor of steel from buildings of an incredible 94%. * BCSA publication no. 35/03
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Quality and service Product range
CE Marking Accreditation
Metsec Lattice Beams Limited has attained CE marking accreditation to Execution Class 3 (EXC 3) of BS EN 1090-2.
CE Marking Accreditation to Execution Class 3 (EXC 3) of BS EN 1090-2.
Since July 1st 2014 CE marking became compulsory for all manufacturers of structural steel components in the UK.
Metsec Lattice Beams Limited's Factory Control Production (FPC), management systems and welding procedures have all been certified by BSI to comply with stringent CE marking standards.
CE marking is a regulatory mark applied by the manufacturer. It is a declaration that the product conforms with the relevant technical specifications and that the required assessment procedures have been complied with.
CE marking accreditation demonstrates our commitment to delivering premium quality products to the market.
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Quality and service Product range
Installation Service As well as being one of the UK’s largest manufacturers and
suppliers of lightweight lattice beams and trusses we also provide a complete design and installation service. Furthermore if our Lattice Beams are part of your specification we can offer the installation of the complete ‘Steelwork Package’ inclusive of cladding and roofing.
Our highly skilled and experienced engineers will work closely with your chosen architect/structural engineer to create a design that meets and exceeds all criteria and ensures your project gets delivered on time and within budget. This attention to quality runs through to the manufacture and installation. With significant experience of working closely with architects, designers and contractors, Metsec Lattice Beams can advise on the best and most efficient way to deliver your project. From developing installation plans, fabrication to the highest standards, logistics, delivery and site management, Metsec Lattice Beams is your preferred partner.
We ensure that all lattice beam and associated ancillary steel installations comply with engineer’s drawings and that the final installation is checked and certified. We are CE accredited and CHAS approved confirming our commitment to provide a quality service including final installation. All site work conforms to latest health and safety requirements including method statement and personnel training.
Proud to be a trusted partner to many of the UK’s leading construction companies, Metsec Lattice Beams has a strong track record in the safe delivery and installation of lattice beams across the UK and Europe for public and private sector clients.
To take advantage of our experienced design and installation service:
• Email your project details to [email protected]
• Complete our online request form
• Phone our technical advisory service directly on +44 (0)1902 408011
We are members of:
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Product range Product range
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Features and benefits
Metsec lattice beams are designed and
manufactured to BS 5950-1: 2000 and 5: 1998 and
are formed from two cold rolled chord sections
with a central web joining the two together.
Typical profiles are shown on page 8-9. The chord
sections are all formed from high yield steel to BS
EN 10149-2: 1996 and have a minimum yield
strength of 355N/mm².
The web members are usually constructed from
solid bar on the smaller joists or hollow section for
the deeper joists and trusses. These are joined to
the chord sections by CO2 shielded arc welding in
a pre-set jig to ensure dimensional accuracy.
This process allows for the design and
manufacture of a vast range of profiles, from
simple parallel joists through to complex double
curve, wave trusses, to suit almost any
application.
Long span
A typical Metsec lattice beam can weigh up to
50% less than its hot rolled counterpart and yet
still achieve spans of up to 40m without the need
for intermediate support columns - which can
allow designers greater flexibility when working
to optimise internal space.
Internal space can also be optimised by passing
services through the web of the lattice rather than
having to suspend them underneath causing a
significant loss of headroom.
Services - excellent head height
The open web configuration of Metsec lattice
beams allows for the simple passage of services
through the web lacings. However, the web
lacings will not necessarily align unless this is
specifically requested.
Where special duct openings are required these
should be positioned near the centre of the beam
where shear is less critical.
Please consult the Metsec Lattice Beam Technical
Department for further information.
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Product range Product range
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Optimised wall/ceiling junctions
Due to the slim profile offered by Metsec lattice
beams’ excellent strength to weight ratio, beams
can be incorporated at the head of partitioning
and drylining systems without any requirement
for separate boxing in or encasement.
This allows continuous and parallel studwork to
full ceiling height, simplifying and accelerating
installation, maximising use of space and
optimising aesthetics.
Pre-engineered offsite - to ease site access
Where site access is a consideration, bolted joints
can be used. The joists are then assembled on site
using H.T. grade 8.8 bolts to join the sections.
Flush site joints to the top and/or bottom chords
are also available.
Factory joints may occasionally be incorporated
into joists. They will always consist of an
appropriate jointing arrangement with a full
profile fillet weld.
Finish – as flexible as your design
All Metsec lattice beams are supplied shot blasted
and factory finished with a Zinc Phosphate primer
as standard. Other painted finishes, including any
standard RAL colour, are available upon request.
This feature is particularly important if it is
desired to leave the lattice members exposed as
part of a ‘feature’ internal roof structure.
A hot-dipped galvanised finish is also available.
This is recommended for cold roofs and roofs with
limited access or exposed locations.
Timber - for rapid, secure fixings
Flush fitting standard ‘Vac-Vac WR’ treated timber
can be supplied if required in the top and/or
bottom chords of all beams. The timber is rigidly
attached to the chords by shot-fired pins at
600mm staggered centres. This offers a simple
fixing medium for certain floor/roof finishes,
timber firrings and/or plasterboard ceilings.
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Product range Product range
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Product range
Parallel beam
Roofs – suitable for use with flat roofs or sloping roofs
where the lattice beams can be laid to falls. They can
also be used as long span purlins and are suitable for use
with most external finishes from lightweight metal
sheeting through to heavier constructions with tiles on
battens or decking.
Floors – suitable for use as joists in all types of flooring
including timber, pre-cast concrete slabs or profiled
metal decking with in-situ poured concrete.
Pitched truss
Pitched trusses are suitable for all types of duo-pitch roof
construction and can be used with most external finishes
from lightweight metal sheeting through to heavier
constructions with tiles on battens or decking.
Tapered truss
Tapered trusses are suitable for all types of mono-pitch
roof construction. They can be used with most external
finishes from lightweight metal sheeting through to
heavier constructions with tiles on battens or decking.
Inverted truss
Inverted trusses are generally used on low pitched
roofing with timber or metal decking and built up
finishes. When used in conjunction with Metsec
Z-section purlins the design of deep valley gutters can
be simplified.
Parallel pitched beam
Parallel pitched beams are suitable for all types of duo-
pitch roof construction providing extra headroom over
that afforded by the pitched truss. They can be used
with most external finishes from lightweight metal
sheeting through to heavier constructions with tiles on
battens or decking.
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Product range Product range
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Curved truss
Curved trusses can provide an aesthetically enhanced
roof profile. When used with a standing seam roof this
type of construction is easy to detail and install giving a
very low maintenance roof.
Curved beam
Curved beams provide an aesthetically enhanced roof
profile construction providing extra headroom over that
afforded by the curved truss. When used with a standing
seam roof this type of construction is easy to detail and
install giving a very low maintenance roof.
Double curved (wave) truss
Double curved trusses provide an ideal solution for the
designer working with modern multi-curved roof
structures. When used in conjunction with Metsec SFS
framing system the structure can be built to a constant
datum and can be used with all typical external finishes
Inverted curved truss
Inverted curved trusses offer designers a simple solution
when specifying a single curve roof structure. This can
be used to enhance the appearance of roof structures and
is frequently specified with standing seam roofing to
create a smooth appearance.
In many of the applications listed above Metsec Z-section purlins
provide an excellent design solution to carry the external finish.
Similarly the wide range of Metsec mezzanine floor C-sections can
provide a range of system solutions for the designer.
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Product range Product range
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Heavy duty range
Metsec lattice beams are the UK’s largest
specialist manufacturer of steel lattice beams and
trusses. All beams are detailed and fabricated to
suit the clients requirements.
Typical truss profiles are shown on the previous
pages, however, we are not restricted to these
and the potential shape and scope of the lattice
trusses is endless. On many occasions the truss
profile is developed to suit Architectural
requirements.
Our 3000m2 manufacturing facility has been
custom developed and laid out in order to
determine the most efficient flow of materials.
This ensures not only highly efficient production
methods but improved levels of consistency and
quality.
Trusses are regularly produced with span of up to
40m and depths up to 4.5m.
Lattice beams are not only used for roof and floors
but are also ideal for long span ceiling supports, pipe bridges and service support gantries.
Lattice beams and trusses can be fabricated to
customers design and specifications. We
regularly model and fabricate lattice beams and
trusses using SHS, RHS and UC sections.
All fabrications are covered with our CE marking
accreditation. This accreditation allows
fabrications of up to and including
Execution Class 3 (EXC 3) of BS EN 1090-2.
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Roof beams Roof beams
Metal roof systems
Metsec lattice beams can offer the ideal solution
for supporting a wide variety of roofing systems
due to their excellent strength to weight ratio.
A typical Metsec lattice beam can weigh up to
50% less than its hot rolled counterpart and yet
still achieve spans of up to 40m without the need
for intermediate support columns – which can
allow designers greater flexibility when working
to optimise internal space.
Internal space can also be optimised by passing
services through the web of the lattice rather than
having to suspend them underneath causing a
significant loss of headroom.
Similarly their aesthetic properties mean that they
can be supplied painted and left exposed as part
of a ‘feature’ internal roof structure.
In addition to the direct reduction of the
environmental footprint of a construction project
by virtue of their lighter weight, lattice beams can
also help to reduce the environmental footprint of
the project by using off-site fabrication to speed
up the construction process of the roof as the
lighter sections can generally be transported and
handled more efficiently on site.
Leasowes Medical Centre, West Midlands
Curved truss with structural deck
Metsec curved trusses can be used to support
structural decks with a suspended ceiling.
The natural open web of the truss allows for the
simple passage of services.
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Roof beams Roof beams
Parallel beam laid to fall
Metsec parallel beams can be used to support Z-section purlins
bolted to cleats pre-welded to the top chord of the beam. Liner tray,
insulation and metal deck provide the weather-proof layer and are
fixed to the Z-section purlins.
Pitched truss with flush-fitting Z-section purlins
Metsec pitched trusses are supported on a hot rolled steel structural
frame. Z-section purlins are fitted flush to the top chord of the
pitched trusses to support standing seam roof, or similar.
Flush fitting Z-section purlins are often used to minimise the overall
construction depth of the roof.
Vauxhall Sales Centre, West Midlands
Staplehurst Medical Centre, Kent
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Roof beams Roof beams
Traditional roof systems
Parallel beam used as purlin
Metsec parallel beams can be
used as long span purlins
supported on load bearing
masonry walls. In this
application timber firrings are
fixed directly to flush fitting
timber inserts in the top chord
of the beam. Timber roof rafters
are then fixed to the timber
firrings to support counter
battens, underlay, tiling battens
and tile or slates.
Firrings
by others
Timber insert
for nailability
Pitched truss used to support
timber purlins
Traditional timber purlins can
be supported on a Metsec
pitched truss. Ply or similar
sheathing is then used to
support weatherproofing layers
of battens, underlay and roof
tiles or slates.
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Roof beams Roof beams
Green roof systems
Parallel beams used to support
steel decking with green roof
surfacing
Metsec parallel beams can be used
to support a structural deck,
membrane, substrate and Sedum
roof.
These beams can be up to 50%
lighter than hot rolled beams and
use far less steel with considerably
less environmental impact than
other systems.
Smithswood School, Solihull
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Roof beams Roof beams
Complete lightweight systems
Metsec lightweight trusses, combined with SFS
stand-alone walling systems, are becoming ever
more popular for constructing complete
structures.
The Metsec Lattice Beam and Framing Divisions
work together closely to provide total construction
solutions for the developer.
The complete wall and roof solution is frequently
installed through the Metsec Framing Division’s
approved installer network. This adds to the
complete, one-source nature of the package in
keeping with the demands of the modern
construction industry.
Patching Lodge, Brighton
Metsec double curve roof system
Metsec lightweight trusses and Z-section purlins can
also be combined with stand alone, light gauge, cold
rolled Steel Framing Systems (SFS) to provide
complete one-source building solutions
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Roof beams Roof beams
Over-roof systems
Building services
Ring beams
Where existing flat roofs are starting to fail or
require upgrading, one option to consider is the
creation of a new pitched, or curved, over-roof
which can be constructed quickly and cost
effectively using lattice trusses.
The lightweight lattice over-roofing system avoids
the need to strengthen the existing roof structure
and can give an existing building a much needed
facelift - typically at a fraction of new build costs.
The new trusses can be spaced at much wider
centres than other over-roof systems, which results
in fewer penetrations and fixings into the existing
structure.
The new lattice trusses are installed to span across
St. Lukes School, Portsmouth.
the building and provide a range of benefits for
the building owner, including improved water
run-off and enhanced building insulation. The
additional space created under the new structure
can also be used to house building services
making usable space available elsewhere in the
structure.
The Metsec lattice team have gained considerable
expertise in the design of trusses for use in over-
roofing projects both large and small.
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Roof beams Roof beams
Eaves cantilever systems
Top chord cantilever
This detail can be used for small
span cantilevers of up
to 1m.
Stiffener angles can be welded
to the sides of the top chord, if
required, to provide an
economic cantilever solution.
Cantilever bolted to welded
stub-post
This detail can be used for
medium span cantilevers of
up to 2m.
The cantilever arm is bolted
to the end post which is
supplied welded into the end
of the lattice.
Since the cantilever roof
element does not require an
insulation layer the line of
the supporting cantilever
eaves structure is
correspondingly raised to
support the top sheet.
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Roof beams Roof beams
Loose, bolt-on cantilever
This detail can be used for large
span cantilevers of
over 2m.
The cantilever arm extends
into the building to provide an
adequate backing span and is
bolted on to the top chord of
the lattice.
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Ceilings and service supports
Ceilings and service support systems
Metsec parallel lattice beams are the ideal
solution for the support of ceiling structures
within existing buildings. Whether the ceiling is a
simple suspension from a secondary grid of
C-sections or is ‘walk-on’ and supported from the
bottom chord of the lattice beam, Metsec has a
range of solutions.
Lattice beams are ideal for clean rooms, data
halls, telecommunications facilities, retail units
and secure locations where long, unobstructed
spans are essential and where their light weight
can minimise the load on to the existing structure.
They can also allow the passage of services
through the lattice’s web without any loss of head
room or need for exposed pipework which can form
a potential dust trap.
Metsec lattice primary members together with
Z or C-section secondary members provide a cost
effective solution to ceiling/service support
requirements.
Metsec parallel beam
Used with secondary C-sections
to support a suspended ceiling.
In the illustration shown, the
ability to run split-level ducting
through the lattice without any
loss of internal headroom is
clearly demonstrated. A further
benefit is that future changes to
the building services can easily
be accommodated by running
piping or ducting through the
lattice.
Service support/pipebridge
Metsec provide an economic system to form
pipebridge and service supports.
Lightweight lattice joists are provided in pairs and
braced together to form spans of up to 40m.
The majority of pipebridges are supplied with a
galvanised finish for external applications.
However, various paint specifications are also
available where required.
Millennium Dome, London
Millennium Dome, London
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Walk-on ceiling systems Ceilings and service supports
Metsec parallel beam
supporting walk-on ceiling
Metsec parallel ceiling support
beams can be used for walk-on
ceiling applications.
Metsec lattice beams are frequently used to create
a support structure for walk-on ceilings in which
an interlocking system of steel faced planks is
used to create a load bearing ceiling construction.
These systems are particularly popular in the
creation of “clean rooms” where sealing the joints
of these planks creates a closed ceiling void in
which the high level mechanical and electrical
services can be installed without the need for
secondary floors or complex support systems.
Ceiling and service support structure
These systems provide an excellent solution to the
location of services and are specifically designed
to allow maintenance engineers to walk on top of
the ceiling system. This facilitates the easy access
to services and components without the need for
the access equipment normally associated with
more basic ceiling installations.
The two photographs to the left show projects
where Metsec lattice beams are employed in walk
on ceiling constructions.
Clean room ceiling support structure
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Floor beams Floor beams
Traditional floor systems
Metsec lattice joists offer a simple solution for the
construction of both conventional and mezzanine
floors due to their excellent strength to weight ratio.
This means that a typical lattice joist can weigh up to 50%
less than their hot rolled counterparts.
Of great importance to the designer is the fact that the
internal space can be optimised by passing services through
the web of the lattice joists rather than having to suspend
them underneath causing a significant loss of headroom.
Similarly, the ability to insert flush fitting timber sections into
the top and bottom chords offers a simple medium for the
fastening of floor decking and/or plasterboard ceilings.
In addition to the direct reduction of the environmental
footprint of a construction project by virtue of their
lighter weight, lattice beams can also help to reduce the
environmental footprint of the project by using off-site
fabrication to speed up the construction process of the
floor as the lighter sections can generally be transported
and handled more efficiently on site.
White Rose Shopping Centre, Leeds.
Traditional floors
Metsec parallel floor joists at
600mm centres with the floor
decking nailed to the top chord
and two layers of plasterboard
to the bottom chord.
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Floor beams Floor beams
Mezzanine floor systems
Mezzanine floors
Metsec parallel floor joists with
C-sections supporting floor decking.
The photograph below shows a
project where 17m span lattice joists
were designed to carry storage
loadings.
Zurich Insurance, Wiltshire
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Fixing details Fixing details
Typical fixing details
F1 – Shoe fixing to concrete padstone F2 – Beam laid to fall
on sloping shoes
F3 – Full depth fixing to concrete padstone F4 – Full depth seating with beam extended
F5 – Beam fixing to internal wall F6 – Beam laid to fall with full depth seat
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Fixing details Fixing details
F7 – Fixing to concrete face with loose angle cleats F8 – Shoe fixing to hot rolled steelwork
F9 – Shoe fixing to hot rolled steelwork (pair) F10 – Full depth fixing to the web of hot rolled
steelwork
F11 – Full depth fixing to hot rolled steelwork F12 – Fixing to internal hot rolled steelwork
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Fixing details Fixing details
Typical fixing details
F13 – Beam to column flange fixing F14 – Beam to column fixing with plate welded
to column
F15 – Beam to beam trimmer fixing F16 – Typical bridging fixing detail
F17 – Bracing fixing detail Note
‘F’ and ‘T’ details illustrate a typical range of connections that are
available. Other connections can be fabricated to suit site conditions.
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Fixing details Fixing details
T1 – Full depth fixing with bearing plate T2 – Purlin to truss fixing
T3 – Truss to column flange fixing T4 – Standard shoe fixing to hot rolled steelwork
T5 – Beam to truss trimmer fixing
T6 – Standard shoe fixing to concrete padstone
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Chord and bridging details Chord and bridging details
Chord details
Nominal dimensions
Chord
type
y
mm
Area
cm2
rxx
cm
ryy
cm
Ixx
cm4
Iyy
cm4
Zxx
cm3
Zyy
cm3
120
35 50 35
MB 50
2.5 y x x
23.27
5.16
1.97
3.14
19.96
50.90
7.47
8.48
135
37.5 60 37.5
MD 4 y
50 x x
24.25
8.53
1.93
3.66
31.84
114.12
12.36
16.91
155
40 75 40
MG 5 y
75 x x
38.13
13.89
2.84
4.27
112.13
253.58
29.41
32.72
210
65 80 65
MJ 5 y
100 x x
45.04
19.14
3.85
5.32
283.15
542.17
51.52
51.64
230
70 90 70
ML 6 y
100 x x
45.51
23.84
3.85
5.94
353.90
840.11
64.94
73.05
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Chord and bridging details Chord and bridging details
Bridging details
Bridging
Bridging is recommended
during the construction period
to enable the beams to support
the construction loads, and to
hold the beams at the centres
and positions indicated on the
plans.
However, when construction
loads are deemed to be light,
bridging can be omitted at the
discretion of the Metsec Lattice
Beam Technical Department.
Bridging
Maximum spacing of bridging for chord sections (m)
Type MB MD MG MJ ML
3.8 4.4 5.2 6.4 7.5 7
Bridging consists of steel angles
connected to the top chord of
the lattice. Bridging may also be
required to the bottom chords
depending on design
considerations. The slenderness
ratio l/r of the bridging angle
must not exceed 250.
Sizes of bridging angle for various joists centres
Centres of joists (m) Standard bridging angle (mm)
0 – 2.4 50 x 50 x 3
2.4 – 3.0 60 x 60 x 5
3.0 – 3.9 80 x 80 x 6
3.9 – 4.9 100 x 100 x 8
Wind reversal
Where construction loads are
light the bottom chords should
be checked for compression due
to the wind reversal forces.
Please contact Metsec Lattice
Beam Technical Department for
further advice.
Knee bracing 28
Design examples and load tables Design examples and load tables
Design examples
Parallel beam - span/depth ratio
As a guide, depths of roof beam, conform approximately to
the following:
Approximate depth = span/20
i.e. 10m span/20 = 500mm deep
Design example
Joist span 10,000mm
Joist spacing 4,500mm
Roof loading:
Decking and insulation 0.20kN/m2
Ceiling and services 0.30kN/m2
Allow S.Wt steelwork 0.10kN/m2
Dead load 0.60kN/m2 x 1.4 = 0.84kN/m2
Imposed load 0.60kN/m2 x 1.6 = 0.96kN/m2
Total load 1.20kN/m2 1.80kN/m2
Total load requirement = 1.80 x 4.5 = 8.10kN/m
Imposed load requirements = 0.6 x 4.5 = 2.70kN/m
Refer to load tables.
Use Metsec lattice beams ref: MD50
Total load capacity 8.83kN/m (>8.10)
Imposed load capacity 3.83kN/m (>2.70)
Important
The lighter the beam, the more cost effective the solution.
Designation
The designation of beam configurations and depths is
given by a simple letter and number code, as follows:
Chord Depth at Configuration Pitch
type shallow end or radius
MB – ML (cm) T (tapered) Gradient (o)
TR (pitched) Radius (m)
PP (parallel pitched)
I (inverted)
CT (curved truss)
CB (curved beam)
Example 1
MD 50
Thus MD50 comprises MD type chord sections with an overall beam
depth of 500mm without pitch or taper.
Example 2
MJ 60 TRW 100
Thus MJ60TRW(100) comprises MJ type chord sections with an
overall truss depth at the shallow end of 600mm rising to a central
ridge with a Warren type web pattern and a 100 slope.
Stone Road, West Midlands
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Design examples and load tables Design examples and load tables
Typical truss options N – type truss
This is the most economical type of joist or truss when
considering gravity loading only and where stress
reversals are insignificant - i.e. longer diagonal members
are in tension.
Warren type truss
May be preferred in having a better appearance than the
N – type joist or truss. Diagonals are alternatively struts
and ties.
This results in a frame less susceptible to deflection than
the N – type.
Warren type truss with vertical posts
Additional members are introduced to the basic warren
type joist or truss to support loads which do not occur at
node positions.
Typical tapered truss options
Summerhill Primary School, West Midlands
30
Design examples and load tables Design examples and load tables
Mets
ec e
aves b
ea
m
Ve
rtic
al b
race
V
ert
ica
l b
race
Ve
rtic
al b
race
V
ert
ica
l b
race
Lattice beam, in steel frame
construction
Lattice beam
The Metsec lattice beam can
provide a very attractive,
lightweight, economical
solution when used as a main
support to the roof structure,
being able to meet short,
medium or long span
requirements.
The beam can be provided with
fully fixed end connections
determined by simple frame
analysis if required.
Alternatively, they can be
simply supported to carry
vertical applied dead and
imposed loads and fixed for
horizontal wind as a common
design assumption.
Purlins
The most economic section used
for supporting the roof cladding
is a cold rolled purlin.
Metsec cold rolled Z-section
purlins provide adequate lateral
restraint to the top
(compression) chord of the
lattice beams.
Bracing
The longitudinal tensile forces
in the Metsec Z-section purlins
resulting from lateral restraint to
the lattice beams are
transmitted to the diagonal
rafter bracing system provided
at each end of the building. In
addition to providing stability to
the lattice beams, bracing also
resists wind loading at the gable
ends (i.e. gable posts propped at
bracing node points) and acts as
stability bracing during
erection.
For longer buildings additional
bracing may be required to
intermediate bays.
Vertical bracing as shown on the
roof plan ensures that all forces
are transmitted to the
foundations.
Gable posts
Optional
bottom tie
CL
Ridge
Knee brace
as required
Cleader rail
Metsec lattice
beam
Metsec lattice
beam
Metsec lattice
beam
Metsec Z purlins
Metsec lattice
beam
Metsec lattice
beam
Metsec lattice
beam
31
Design examples and load tables Design examples and load tables
Load bearing walls
Ho
rizon
tal s
pa
n
of
rin
g b
eam
Lo
ng
itu
din
al t
ie
Lo
ng
itu
din
al t
ie
Lattice truss in load bearing wall
construction
Metsec
truss
Metsec
Z purlins
Metsec
truss
Services
Metsec truss
Metsec truss
“Suspended” ceiling
Eaves
bracing
Lattice truss
The Metsec lattice truss provides a
lightweight, economic solution
when used as the roof lid main
support member on load bearing
wall construction. The lattice form
provides a more flexible service
zone within the ceiling void.
Large spans of up to 40m are easily
accommodated.
Purlins
Metsec cold rolled Z-section
purlins are used as economic
support to the roof cladding and
provide adequate lateral restraint
to the top (compression) chord of
the lattice truss.
Rafter bracing
The longitudinal forces in the
Metsec Z-section purlins resulting
from lateral restraint to the lattice
truss are transmitted to the
diagonal rafter bracing system.
Bottom tie bracing
The wind loading on vertical
spanning side walls is resisted by a
horizontal bracing system utilising
a steel or concrete ring beam at
bottom chord (eaves) level. This
ring beam may be returned on the
gable ends to provide intermediate
lateral support to the walls.
The longitudinal ties also serve as
lateral restraint members to the
bottom chord of lattice truss in
compression from wind uplift.
Ring
beam
32
Design examples and load tables Design examples and load tables
Load tables - Parallel beams
Joist Overall Typical node Ixx Self weight
type depth (mm) centres (mm) (cm4) (kg/m)
5
6
7
8
9
Span (m)
10
11
12
13
14
15
16
17
MB22 220 250 816 10 6.58 3.81 2.40 2.86 1.65 1.04
MB27 270 350 1328 10 6.42 5.35 3.90 2.61 4.01 2.69 1.69 1.13
MB30 300 380 1697 11 11.32 7.86 4.99 3.34 2.35 5.94 3.44 2.16 1.45 1.02
MD30 300 380 2762 16 13.33 11.11 8.11 5.44 3.82 2.78 8.33 5.59 3.52 2.36 1.66 1.21
MB35 350 600 2416 12 13.56 9.42 6.92 4.75 3.34 2.43 8.45 4.89 3.08 2.06 1.45 1.06 MD35 350 600 3941 17 17.08 14.24 11.58 7.76 5.45 3.97 2.98
10.68 7.98 5.03 3.37 2.36 1.72 1.29 MG35 350 600 5429 28 37.01 25.33 15.95 10.68 7.50 5.47 4.11 3.17 2.49 18.99 10.99 6.92 4.64 3.26 2.37 1.78 1.37 1.08
MB40 400 600 3263 12 15.79 10.97 8.06 6.17 4.51 3.29 2.47 9.87 6.61 4.16 2.79 1.96 1.43 1.07 MD40 400 600 5334 17 17.17 14.31 12.27 10.50 7.37 5.37 4.04 3.11 10.73 8.95 6.80 4.56 3.20 2.33 1.75 1.35 MG40 400 600 7504 28 40.28 30.87 22.04 14.77 10.37 7.56 5.68 4.38 3.44 2.76
25.17 15.19 9.57 6.41 4.50 3.28 2.47 1.90 1.49 1.20 MB45 450 600 4240 13 18.03 12.52 9.20 7.04 5.56 4.27 3.21 11.27 7.82 5.41 3.62 2.54 1.85 1.39 MD45 450 600 6940 20 22.15 18.46 15.82 12.42 9.59 6.99 5.25 4.05 3.18 2.55
13.85 11.54 8.85 5.93 4.16 3.04 2.28 1.76 1.38 1.11 MG45 450 600 9926 29 42.82 35.63 26.18 19.53 13.72 10.00 7.51 5.79 4.55 3.64 2.96 2.44 26.76 20.10 12.66 8.48 5.95 4.34 3.26 2.51 1.98 1.58 1.29 1.06
MJ45 450 600 12965 37 42.18 35.15 30.13 25.52 17.92 13.06 9.81 7.56 5.95 4.76 3.87 3.19 2.66 26.36 21.97 16.53 11.07 7.78 5.67 4.26 3.28 2.58 2.07 1.68 1.38 1.15 MB50 500 600 5345 14 20.26 14.07 10.34 7.91 6.25 5.06 4.05 3.12 2.45 12.66 8.79 6.46 4.57 3.21 2.34 1.76 1.35 1.06 MD50 500 600 8759 19 21.45 17.88 15.32 13.41 11.04 8.83 6.63 5.11 4.02 3.22 2.62
13.41 11.17 9.58 7.48 5.25 3.83 2.88 2.22 1.74 1.40 1.13 MG50 500 600 12696 29 44.82 37.35 29.68 22.72 17.55 12.79 9.61 7.40 5.82 4.66 3.79 3.12 2.60
28.01 23.34 16.19 10.84 7.62 5.55 4.17 3.21 2.53 2.02 1.65 1.36 1.13
MJ50 500 600 16649 37 44.31 36.93 31.65 27.70 23.01 16.78 12.60 9.71 7.64 6.11 4.97 4.10 3.41 27.70 23.08 19.78 14.22 9.99 7.28 5.47 4.21 3.31 2.65 2.16 1.78 1.48 ML50 500 600 20650 46 55.94 46.62 39.96 34.96 28.54 20.81 15.63 12.04 9.47 7.58 6.17 5.08 4.24
34.96 29.14 24.97 17.64 12.39 9.03 6.79 5.23 4.11 3.29 2.68 2.20 1.84 MB55 550 600 6580 14 20.38 15.62 11.48 8.79 6.94 5.62 4.65 3.84 3.02 2.42 12.74 9.76 7.17 5.49 3.95 2.88 2.16 1.67 1.31 1.05 MD55 550 600 10791 19 20.42 17.02 14.59 12.76 11.35 9.93 8.17 6.29 4.95 3.96 3.22 2.65
12.76 10.64 9.12 7.98 6.47 4.72 3.55 2.73 2.15 1.72 1.40 1.15 MG55 550 600 15813 30 46.39 38.66 33.14 25.41 20.07 15.93 11.97 9.22 7.25 5.81 4.72 3.89 3.24
29.00 24.16 20.16 13.51 9.49 6.92 5.20 4.00 3.15 2.52 2.05 1.69 1.41
MJ55 550 600 20812 38 45.99 38.33 32.85 28.75 25.55 20.97 15.76 12.14 9.54 7.64 6.21 5.12 4.27 28.75 23.95 20.53 17.78 12.49 9.10 6.84 5.27 4.14 3.32 2.70 2.22 1.85 ML55 550 600 25824 47 58.07 48.39 41.48 36.29 32.26 26.02 19.55 15.06 11.84 9.48 7.71 6.35 5.30
36.29 30.25 25.92 22.06 15.49 11.29 8.49 6.54 5.14 4.12 3.35 2.76 2.30 MB60 600 600 7943 13 19.15 15.96 12.62 9.66 7.63 6.18 5.11 4.29 3.64 2.92 11.97 9.97 7.88 6.04 4.77 3.47 2.61 2.01 1.58 1.27 MD60 600 600 13037 18 19.20 16.00 13.71 12.00 10.67 9.60 8.73 7.58 5.98 4.79 3.89 3.21 2.67
12.00 10.00 8.57 7.50 6.67 5.70 4.28 3.30 2.60 2.08 1.69 1.39 1.16 MG60 600 600 19277 28 47.65 39.71 34.03 28.09 22.19 17.98 14.59 11.24 8.84 7.08 5.76 4.74 3.95 29.78 24.82 21.27 16.47 11.56 8.43 6.33 4.88 3.84 3.07 2.50 2.06 1.72
MJ60 600 900 25453 36 41.17 34.31 29.41 25.73 22.87 20.59 18.71 14.84 11.67 9.35 7.60 6.26 5.22 25.73 21.44 18.38 16.08 14.30 11.13 8.36 6.44 5.07 4.06 3.30 2.72 2.27 ML60 600 900 31594 45 51.98 43.31 37.13 32.48 28.88 25.99 23.63 18.42 14.49 11.60 9.43 7.77 6.48 32.48 27.07 23.20 20.30 18.05 13.82 10.38 8.00 6.29 5.04 4.09 3.37 2.81 MB65 650 600 9436 15 26.96 18.72 13.76 10.53 8.32 6.74 5.57 4.68 3.99 3.44 2.82
16.85 11.70 8.60 6.58 5.20 4.13 3.10 2.39 1.88 1.50 1.22 MD65 650 600 15496 20 36.08 30.07 24.31 18.61 14.71 11.91 9.84 8.27 7.05 5.69 4.63 3.81 3.18
22.55 18.79 15.19 11.63 9.19 6.78 5.09 3.92 3.08 2.47 2.01 1.65 1.38 MG65 650 600 23088 29 48.66 40.55 34.76 30.41 24.31 19.69 16.27 13.46 10.59 8.48 6.89 5.68 4.74 30.41 25.34 21.72 19.01 13.85 10.10 7.59 5.84 4.60 3.68 2.99 2.47 2.06 MJ65 650 900 30572 37 42.38 35.31 30.27 26.49 23.54 21.19 19.26 17.66 14.02 11.23 9.13 7.52 6.27 26.49 22.07 18.92 16.55 14.71 13.24 10.05 7.74 6.09 4.87 3.96 3.26 2.72 ML65 650 900 37960 46 53.64 44.70 38.31 33.52 29.80 26.82 24.38 22.13 17.41 13.94 11.33 9.34 7.79
33.52 27.94 23.94 20.95 18.62 16.60 12.47 9.61 7.56 6.05 4.92 4.05 3.38 MB70 700 900 11057 16 29.20 20.27 14.90 11.40 9.01 7.30 6.03 5.07 4.32 3.72 3.24 2.72 18.25 12.67 9.31 7.13 5.63 4.56 3.63 2.80 2.20 1.76 1.43 1.18 MD70 700 900 18168 21 33.18 27.65 23.70 20.16 15.93 12.90 10.66 8.96 7.63 6.58 5.42 4.47 3.73
20.73 17.28 14.81 12.60 9.96 7.95 5.97 4.60 3.62 2.90 2.35 1.94 1.62 MG70 700 900 27247 29 43.44 36.20 31.03 27.15 24.13 21.41 17.69 14.87 12.50 10.01 8.13 6.70 5.59 27.15 22.62 19.39 16.97 15.08 11.92 8.95 6.90 5.42 4.34 3.53 2.91 2.43 MJ70 700 900 36171 37 43.24 36.04 30.89 27.03 24.02 21.62 19.66 18.02 16.59 13.28 10.80 8.90 7.42 27.03 22.52 19.31 16.89 15.02 13.51 11.88 9.15 7.20 5.76 4.69 3.86 3.22 ML70 700 900 44922 46 54.89 45.74 39.20 34.30 30.49 27.44 24.95 22.87 20.60 16.50 13.41 11.05 9.21 34.30 28.59 24.50 21.44 19.06 17.15 14.76 11.37 8.94 7.16 5.82 4.80 4.00 MD80 800 900 24153 22 34.59 28.83 24.71 21.62 18.37 14.88 12.30 10.34 8.81 7.59 6.61 5.81 4.95 21.62 18.02 15.44 13.51 11.48 9.30 7.69 6.11 4.81 3.85 3.13 2.58 2.15 MG80 800 900 36606 30 44.35 36.96 31.68 27.72 24.64 22.17 20.16 17.25 14.70 12.67 10.93 9.01 7.51 27.72 23.10 19.80 17.32 15.40 13.86 12.03 9.26 7.29 5.83 4.74 3.91 3.26 MJ80 800 900 48803 38 44.27 36.89 31.62 27.67 24.59 22.13 20.12 18.44 17.03 15.81 14.57 12.01 10.01 27.67 23.06 19.76 17.29 15.37 13.83 12.58 11.53 9.71 7.78 6.32 5.21 4.34 ML80 800 900 60635 47 56.53 47.11 40.38 35.33 31.41 28.27 25.70 23.55 21.74 20.19 18.10 14.92 12.44 35.33 29.44 25.24 22.08 19.63 17.67 16.06 14.72 12.07 9.66 7.86 6.47 5.40 MD90 900 900 30990 22 35.65 29.71 25.46 22.28 19.80 16.86 13.94 11.71 9.98 8.60 7.49 6.59 5.83 22.28 18.57 15.91 13.93 12.38 10.54 8.71 7.32 6.17 4.94 4.02 3.31 2.76 MG90 900 900 47355 31 44.57 37.14 31.83 27.85 24.76 22.28 20.26 18.57 16.73 14.42 12.57 11.04 9.71 27.85 23.21 19.90 17.41 15.47 13.93 12.66 11.61 9.43 7.55 6.14 5.06 4.22 MJ90 900 900 63349 39 44.57 37.14 31.84 27.86 24.76 22.29 20.26 18.57 17.14 15.92 14.86 13.93 12.99 27.86 23.21 19.90 17.41 15.48 13.93 12.66 11.61 10.71 9.95 8.21 6.76 5.64 ML90 900 900 78732 48 57.32 47.77 40.94 35.83 31.85 28.66 26.06 23.88 22.05 20.47 19.11 17.91 16.15 35.83 29.86 25.59 22.39 19.90 17.91 16.28 14.93 13.78 12.55 10.20 8.41 7.01 MG100 1000 900 59492 32 44.29 36.91 31.63 27.68 24.60 22.14 20.13 18.45 17.03 15.82 14.09 12.38 10.97 27.68 23.07 19.77 17.30 15.38 13.84 12.58 11.53 10.65 9.48 7.71 6.35 5.30 MJ100 1000 900 79809 40 44.35 36.96 31.68 27.72 24.64 22.18 20.16 18.48 17.06 15.84 14.78 13.86 13.04 27.72 23.10 19.80 17.32 15.40 13.86 12.60 11.55 10.66 9.90 9.24 8.52 7.10 ML100 1000 900 99214 49 57.50 47.92 41.07 35.94 31.94 28.75 26.14 23.96 22.12 20.54 19.17 17.97 16.91
35.94 29.95 25.67 22.46 19.97 17.97 16.34 14.97 13.82 12.83 11.98 10.59 8.83 Span (m) 5 6 7 8 9 10 11 12 13 14 15 16 17
Standard camber (mm) 3 4 6 7 9 12 14 16 19 22 26 29 33 33
Design examples and load tables Design examples and load tables
Notes on load tables
1. All loads are in kilo Newtons per
metre (kN/m),calculated in accordance
with BS 5950-1 and 5:1998.
2. Figures in black type are ultimate total
loads per metre.
3. BS 5950: 1998 recommends that imposed
load deflections are limited to span/360
where applicable. Therefore safe working
loads shown in red type are calculated with
a deflection limit of span/360.
4. By calculating Unfactored imposed loads and
ultimate total loads in kilo Newtons per linear
metre (kN/m) and referring to the appropriate
table a suitable selection can be made by
satisfying both imposed load and total
load criteria.
5. Tables are based on:
5.1 The top (compression) chord of the beam
is provided with adequate lateral restraints at
spacings not greater than 1.8m.
5.2 The load is uniformly distributed on the
full span.
6. Roof beams are fabricated with an upward
camber. The approximate camber for various
spans is shown in the tables.
Floor joists are supplied straight unless a
camber is specifically requested.
7. When design requirements are for depths
greater than 2.0m, or when curved, pitched or
tapered profiles are required, please refer to
LatticeSPEC design software or consult the
Metsec Lattice Beam Technical Department.
18
19
20
21
22
23
24
25
Span (
26
)
27
28
29
30
31
32
33
34
No
1.
2.
3.
4.
5.
6.
7.
tes on load tables
All loads are in kilo Newtons per metre
(kN/m), and are calculated in accordance with
BS 5950-1: 2000 and 5: 1998.
Figures in black type are Ultimate total loads
per metre.
BS 5950-1: 2000 and 5: 1998 recommends that
Unfactored imposed load deflections are
limited to span/360 where applicable.
Therefore safe working loads shown in red
type are calculated with a deflection limit of
span/360.
By calculating Unfactored imposed loads and
Ultimate total loads in kilo Newtons per linear
metre (kN/m) and referring to the appropriate
table a suitable selection can be made by
satisfying both imposed load and total load
criteria.
Tables are based on:
5.1 The top (compression) chord of the beam is
provided with adequate lateral restraints at
spacings not greater than 1.8m.
5.2 The load is uniformly distributed on the
full span.
Roof beams are fabricated with an upward
camber. The approximate camber for various
spans is shown in the tables.
Floor joists are supplied straight unless a
camber is specifically requested.
When design requirements are for depths
greater than 2.0m, or when curved, pitched or
tapered profiles are required, please refer to
LatticeSPEC design software or consult the
Metsec Lattice Beam Technical Department.
2.24 0.97 2.88 1.25 3.57 3.03 2.60 1.55 1.32 1.13
2.73
1.19
3.60 3.06 2.62 1.56 1.33 1.14 4.46 3.79 3.25 2.81 1.94 1.65 1.41 1.22
3.33 2.83
1.45 1.23
4.40 3.74 3.21 2.77
1.91 1.62 1.39 1.20 5.46 4.64 3.98 3.44 2.99 2.37 2.01 1.73 1.49 1.30
2.68
1.16
3.99 3.39 2.91
1.73 1.47 1.26
5.28 4.49 3.85 3.33 2.89 2.53
2.29 1.95 1.67 1.44 1.26 1.10
6.56 5.58 4.78 4.13 3.59 3.14 2.77 2.85 2.42 2.08 1.79 1.56 1.36 1.20
3.14 2.67
1.36 1.16
4.71 4.00 3.43 2.96 2.58
2.04 1.74 1.49 1.29 1.12
6.25 5.31 4.56 3.94 3.42 3.00 2.64
2.71 2.31 1.98 1.71 1.49 1.30 1.14
7.76 6.60 5.66 4.89 4.25 3.72 3.27 2.90
3.37 2.86 2.46 2.12 1.85 1.61 1.42 1.26
4.17 3.55 3.04 2.63
1.81 1.54 1.32 1.14
6.32 5.38 4.61 3.98 3.46 3.03 2.67
2.75 2.33 2.00 1.73 1.50 1.32 1.16
8.43 7.17 6.15 5.31 4.62 4.04 3.56 3.15 2.80
3.66 3.11 2.67 2.30 2.00 1.75 1.54 1.37 1.21
10.48 8.91 7.64 6.60 5.74 5.02 4.42 3.91 3.48 3.10 2.78
4.55 3.87 3.31 2.86 2.49 2.18 1.92 1.70 1.51 1.35 1.21
5.20 4.55 3.90 3.37 2.93 2.57
2.32 1.98 1.69 1.46 1.27 1.11
8.18 6.96 5.96 5.15 4.48 3.92 3.45 3.05 2.71
3.55 3.02 2.59 2.24 1.94 1.70 1.50 1.33 1.18
10.95 9.31 7.98 6.89 5.99 5.25 4.62 4.09 3.63 3.24 2.91 2.62
4.75 4.04 3.46 2.99 2.60 2.28 2.00 1.77 1.58 1.41 1.26 1.14
13.60 11.57 9.92 8.57 7.45 6.52 5.74 5.08 4.51 4.03 3.61 3.25 2.94 2.66
5.90 5.02 4.30 3.72 3.23 2.83 2.49 2.20 1.96 1.75 1.57 1.41 1.28 1.16
9.79 8.74 7.49 6.47 5.63 4.93 4.34 3.84 3.41 3.05 2.73
4.46 3.79 3.25 2.81 2.44 2.14 1.88 1.67 1.48 1.32 1.19
12.32 11.67 10.05 8.68 7.55 6.61 5.82 5.15 4.58 4.09 3.66 3.30 2.98
5.98 5.09 4.36 3.77 3.28 2.87 2.52 2.23 1.99 1.77 1.59 1.43 1.29
15.97 14.57 12.50 10.79 9.39 8.22 7.23 6.40 5.69 5.08 4.55 4.10 3.70 3.36 3.05 2.78 2.54
7.44 6.33 5.42 4.69 4.07 3.57 3.14 2.78 2.47 2.20 1.98 1.78 1.61 1.46 1.32 1.21 1.10
18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
37 41 45 50 55 60 65 71 77 83 89 96 100 109 116 124 131
m
34
Design examples and load tables Design examples and load tables
Load tables - Parallel beams
Joist Overall Typical node Ixx Self weight
type depth (mm) centres (mm) (cm4) (kg/m)
10
12
14
16
18
20
22
24
26
28
30
32
34
MG110 1100 900 73019 32 21.81 18.18 15.58 13.63 10.84 8.78 6.91 5.32 13.63 11.36 9.74 7.80 5.48 3.99 3.00 2.31
MJ110 1100 900 98184 40 21.87 18.22 15.62 13.67 12.15 10.93 9.29 7.16 5.63 4.51 3.66 13.67 11.39 9.76 8.54 7.36 5.37 4.03 3.11 2.44 1.96 1.59
ML110 1100 900 122080 50 28.61 23.85 20.44 17.88 15.90 14.31 11.55 8.90 7.00 5.60 4.56 3.75 3.13
17.88 14.90 12.77 11.18 9.15 6.67 5.01 3.86 3.04 2.43 1.98 1.63 1.36
MG120 1200 1200 87935 31 19.76 16.47 14.11 12.35 10.98 9.64 7.97 6.41 5.04 12.35 10.29 8.82 7.72 6.59 4.81 3.61 2.78 2.19
MJ120 1200 1200 118472 39 19.70 16.42 14.07 12.32 10.95 9.85 8.96 8.21 6.79 5.44 4.42 12.32 10.26 8.80 7.70 6.84 6.16 4.87 3.75 2.95 2.36 1.92
ML120 1200 1200 147330 48 26.38 21.98 18.84 16.49 14.66 13.19 11.99 10.74 8.45 6.76 5.50 4.53 3.78
16.49 13.74 11.78 10.30 9.16 8.05 6.05 4.66 3.67 2.94 2.39 1.97 1.64
MJ130 1300 1200 140675 40 19.42 16.18 13.87 12.14 10.79 9.71 8.83 8.09 7.47 6.46 5.25 12.14 10.11 8.67 7.58 6.74 6.07 5.52 4.45 3.50 2.80 2.28
ML130 1300 1200 174965 49 26.16 21.80 18.69 16.35 14.53 13.08 11.89 10.90 10.03 8.03 6.53 5.38 4.49
16.35 13.62 11.68 10.22 9.08 8.17 7.19 5.54 4.35 3.49 2.83 2.34 1.95
MJ140 1400 1200 164792 40 18.91 15.76 13.51 11.82 10.51 9.46 8.60 7.88 7.27 6.76 6.15 5.07 11.82 9.85 8.44 7.39 6.57 5.91 5.37 4.93 4.10 3.28 2.67 2.20
ML140 1400 1200 204984 50 25.80 21.50 18.43 16.13 14.33 12.90 11.73 10.75 9.92 9.21 7.65 6.30 5.26
16.13 13.44 11.52 10.08 8.96 8.06 7.33 6.48 5.10 4.08 3.32 2.74 2.28
MJ150 1500 1200 190823 41 18.32 15.27 13.09 11.45 10.18 9.16 8.33 7.63 7.05 6.54 6.11 5.73 11.45 9.54 8.18 7.16 6.36 5.73 5.21 4.77 4.40 3.80 3.09 2.55
ML150 1500 1200 237388 51 25.33 21.11 18.09 15.83 14.07 12.67 11.51 10.55 9.74 9.05 8.44 7.30 6.09
15.83 13.19 11.31 9.89 8.80 7.92 7.20 6.60 5.91 4.73 3.85 3.17 2.64
MJ160 1600 1200 218769 42 17.67 14.72 12.62 11.04 9.82 8.83 8.03 7.36 6.80 6.31 5.89 5.52 5.20
11.04 9.20 7.89 6.90 6.14 5.52 5.02 4.60 4.25 3.94 3.54 2.92 2.43
ML160 1600 1200 272176 51 24.77 20.64 17.69 15.48 13.76 12.38 11.26 10.32 9.53 8.85 8.26 7.74 6.98
15.48 12.90 11.06 9.67 8.60 7.74 7.04 6.45 5.95 5.42 4.41 3.63 3.03
MJ170 1700 1200 248628 42 16.97 14.14 12.12 10.61 9.43 8.48 7.71 7.07 6.53 6.06 5.66 5.30 4.99
10.61 8.84 7.58 6.63 5.89 5.30 4.82 4.42 4.08 3.79 3.54 3.31 2.77
ML170 1700 1200 309348 52 24.13 20.11 17.24 15.08 13.41 12.07 10.97 10.05 9.28 8.62 8.04 7.54 7.10
15.08 12.57 10.77 9.43 8.38 7.54 6.86 6.28 5.80 5.39 5.01 4.13 3.44
MJ180 1800 1200 280402 43 16.24 13.54 11.60 10.15 9.02 8.12 7.38 6.77 6.25 5.80 5.41 5.08 4.78
10.15 8.46 7.25 6.35 5.64 5.08 4.61 4.23 3.90 3.63 3.38 3.17 2.99
ML180 1800 1200 348905 53 23.43 19.53 16.74 14.65 13.02 11.72 10.65 9.76 9.01 8.37 7.81 7.32 6.89
14.65 12.21 10.46 9.15 8.14 7.32 6.66 6.10 5.63 5.23 4.88 4.58 3.88
MJ190 1900 1200 314089 44 15.51 12.92 11.08 9.69 8.62 7.75 7.05 6.46 5.96 5.54 5.17 4.85 4.56 9.69 8.08 6.92 6.06 5.38 4.85 4.41 4.04 3.73 3.46 3.23 3.03 2.85
ML190 1900 1200 390846 54 22.69 18.91 16.21 14.18 12.61 11.35 10.32 9.46 8.73 8.11 7.56 7.09 6.67
14.18 11.82 10.13 8.87 7.88 7.09 6.45 5.91 5.46 5.07 4.73 4.43 4.17
MJ200 2000 1200 349691 44 14.77 12.31 10.55 9.23 8.21 7.39 6.71 6.15 5.68 5.28 4.92 4.62 4.34
9.23 7.69 6.59 5.77 5.13 4.62 4.20 3.85 3.55 3.30 3.08 2.89 2.72
ML200 2000 1200 435172 55 21.92 18.27 15.66 13.70 12.18 10.96 9.96 9.13 8.43 7.83 7.31 6.85 6.45
13.70 11.42 9.79 8.56 7.61 6.85 6.23 5.71 5.27 4.89 4.57 4.28 4.03
Span (m) 10 12 14 16 18 20 22 24 26 28 30 32 34 Standard camber (mm) 12 16 22 29 37 45 55 65 77 89 100 116 131
Notes on load tables
1. All loads are in kilo Newtons per metre (kN/m),
and are calculated in accordance with BS 5950-1: 2000
and 5: 1998.
2. Figures in black type are Ultimate total loads
per metre.
3. BS 5950-1: 2000 and 5: 1998 recommends that
Unfactored imposed load deflections are limited to
span/360 where applicable. Therefore safe working
loads shown in red type are calculated with a deflection
limit of span/360.
4. By calculating Unfactored imposed loads and Ultimate
total loads in kilo Newtons per linear metre (kN/m) and
referring to the appropriate table a suitable selection
can be made by satisfying both imposed load and total
load criteria.
5. Tables are based on:
5.1 The top (compression) chord of the beam is
provided with adequate lateral restraints at spacings
not greater than 1.8m.
5.2 The load is uniformly distributed on the full span.
6. Roof beams are fabricated with an upward camber.
The approximate camber for various spans is shown in
the tables.
Floor joists are supplied straight unless a camber is
specifically requested.
7. When design requirements are for depths greater
than 2.0m, or when curved, pitched or tapered
profiles are required, please refer to LatticeSPEC
design software or consult the Metsec Lattice Beam
Technical Department.
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Services and design software Services and design software
Services and general notes
Detailing service
Working from Architects’ and Consulting
Engineers’ drawings, Metsec’s team of engineers
and specialist 3D detailers will produce structural
layouts and sections to assist the site team along
with full fabrication drawings.
Customer service
Metsec are committed to providing the highest
levels of customer satisfaction and ensure that our
staff are trained to the highest possible levels in
order to assist our customers at all stages of the
design and installation process.
Our sales teams in particular have a thorough
knowledge of our products and should be able to
resolve most of your questions quickly and
professionally.
Research and development
Metsec operate a policy of continuous research
and development reserving the rights to change
the specification for products in this literature
without prior notice.
Company Registration
Metsec Lattice Beams Ltd
Registered Office: Units 10 & 11 Rolls
Royce Estate, Spring Road, Ettingshall,
Wolverhampton, West Midlands WV4 6JX.
Company Number: 07959668 (England)
Tividale High School, West Midlands.
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Services and design software Services and design software
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Software
Design software
Metsec are pioneers when it comes to the
provision of design software packages. Our first
package for lattice design was produced in 1989,
since when we have been continually updating
and improving the packages that we offer.
Today, Metsec produce a number of stand-alone
design software packages including LatticeSPEC
for our complete range of lattice beam solutions.
This package enables the quick and easy design
of all types of lattice beams. It also includes an
option to export the profile of the lattice with its
end section in .dxf format, enabling specifiers to
import direct to their working drawings and to
quickly and efficiently complete their detailing.
For a free copy of the latest LatticeSPEC software
please contact MLB on 01902 408011or visit our
website: www.metseclatticebeams.com
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Designed and produced by Communication Design Partnership 01959 562777
37
Metsec Lattice Beams Ltd
Units 10 & 11 Rolls Royce Estate, Spring Road,
Ettingshall, Wolverhampton,
West Midlands. WV4 6JX
Tel: 44+ (0) 1902 408011
Email : [email protected]
www.metseclatticebeams.com
© Copyright METSEC plc 2008
In the interests of a policy of continuous research and development,
Metsec Lattice Beams Ltd reserve the right to change the
specifications in this publication without prior notice.