CFS-2 Safe Load Tables

• Many uses in the construction, general fabrication and home handyman fields

• New steel sections enable more cost-effective use of materials and therefore less weight

• Steel sections provide reliable performance, long life and freedom from warping, twisting, shrinking, rotting and damage from termites

• Wide range of section shapes, sizes and thicknesses are available

Cold Formed Sections

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Angle SectionsIn addition to plain and lipped channels forwhich comprehensive load tables areprovided, the BlueScope Lysaght’s coldformed steel sections range includes anumber of new high strength angles. Theseangles have a variety of uses such as forbracing purposes and in the construction ofgates, fences, handrails, frames andstorage racks, as well as in many of theother applications listed below.

ApplicationsSome of the many uses for BlueScopeLysaght’s cold formed steel sections are:

• Structural Building frames, floor joists,roof trusses, purlins and girts, gates,tank stands, stock pens, ladders,mullions and lintels, beams andcolumns, fences.

• Mechanical Car trailers, boat trailers,truck and bus bodies, agriculturalmachinery, rolling stock, conveyorframes, crane frames, containers,pallets and storage racks.

Adverse ConditionsIf it is intended to use BlueScope Lysaght’scold formed steel sections in exposedsituations within 1km of salt marinelocations, or in severe industrial orunusually corrosive environments, pleasecontact your nearest BlueScope LysaghtOffice for specialised advice.

PerformanceBlueScope Lysaght’s cold-formed steelsections will perform as specified if design,fabrication and fixing are in accordancewith the Company’s recommendations.

SpecificationsThe information in this literature is correctat time of printing. However, specificationsare subject to change without notice.

Introduction

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Notes to Load Tables

Load capacities are given for totaluniformly distributed loads over simplespans in kilonewtons per metre (kN/m). Tofind load capacities for one or moreconcentrated loads (in kN), the values intables should be multiplied by the factors inTable A. Where more than one load iscarried, the above conversion factors applyto total of all loads shown in respectivediagrams. Loads are assumed to be equaland equidistant.

Where the compression flange of abeam is braced against sidewisemovement, the load capacity of the beamcan be considerably greater, especiallyover long spans. Tables show loadcapacities for fully braced as well asunbraced beams.An example of a fully braced beam is afloor joist, where floor boards fully bracethe upper (compression) flange. Similarly,roof sheeting fully braces purlins fordownward loading,e.g. dead load or live load, but roof sheetingdoes not brace purlins for upward loads,e.g. a wind suction load, as thecompression flange is then unbraced. Anexample of a completely unbraced beamwould be one with load(s) hanging from it.However, loads carried by beams usuallyprovide some bracing, and the loadcapacity can be found by interpolatingbetween two extreme bracing conditionsshown in the tables.

End bearing capacity depends upon thelength of bearing (beam support). Todetermine the bearing capacity for anylength of bearing from the tables, take thevalue for the first 10 mm and add therequired number of 10 mm incrementvalues to make up the total actual length of

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2

1bearing. For instance, the end bearingcapacity of a beam having a length ofbearing of 50 mm is made up of first 10 mmplus 4 additional increments of 10 mm. Endbearing capacity of a LC07630 for samelength bearing is:

First 10 mm = 8.50 kN+ 4 incr. @ 0.27 kN = 1.08 kN Bearingcapacityfor 50 mm = 9.58 kN

The maximum bearing capacity is given inthe last column. This value must not beexceeded regardless of the length ofbearing. If the length of bearing for thesection in the above example wasincreased to say, 110 mm, the calculatedbearing capacity would be 11.47 kN. Thisis, however, invalid as the maximum

permissible capacity for the section is11.10 kN. (The maximum permissible endbearing capacity corresponds to a lengthof bearing equal to the clear distancebetween flanges. Bearing length increasebeyond that dimension, then, would notimprove the end bearing capacity).

Above applies only where section issupported by the flanges, i.e. not for boltedor welded webs.

Sections’ own mass is not consideredin load tables.4

Length of bearing Beam

Support

Notes to load tables

Loading Condition Diagram Factor

Single load at mid span 0.5

Two loads equally spaced 0.75

Four loads equally spaced 0.833

Single load off centre L2 / 8ab

L / 4aTwo loads

Three loads equally spaced 0.75

L

a b

L

a b

Table A

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Plain Channels

ShearCentre Centroid

y B

xx

y

t

c

D

R

xO

Plain Channels

Table 1 Plain Channels

5

6

Lipped Channels

ShearCentre Centroid

B

L

y

D X

X

(BMT)

R3.2

y

t

X

XO

Lipped Channels

Table 2 Lipped Channels

7

8

Compound Plain Channels (Nested)

B

D X

(BMT)t

2

Average Gap

R

y

X

Plain Channels (toe to toe)

Table 4 Compound Plain Channels toe-to-toe

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10

Compound Plain Channels (Nested)

B

D

L

X

(BM

T)

R

y

y

X

Plain Channels (back to back)

Table 3 Compound Plain Channels back-to-back

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12

Compound Lipped Channel (Nested)

B

L

y

y

D X

t

X

R3.2

Table 5 Compound Lipped Channels (toe-to-toe)

Table 6 Compound Lipped Channels (back-to-back)

Lipped Channel (toe to toe)

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GeneralCold formed sections are suitable for alltypes of welding, such as spot welding,seam welding, projection welding, plugwelding and arc welding, all of which areapplicable to both uncoated and zinc coatedsections.

Fabricators generally prefer arc welding.A few typical examples of weld fillets areshown on page 15. Suitable electrodeclassification is E41 XX. Current should beadjusted to suit the steel thickness, but theheat input should be kept to a practicableminimum. Multiple weld beads should beavoided.

Arc welding of zinc coated sections doesnot differ from that of uncoated sections,except that the electrode should be appliedmore slowly, making sure that the zinccoating evaporates ahead of the weldingseam. Adequate ventilation should beprovided.

Compound SectionsIn making compound beam sections bywelding two channels web-to-web or toe-to-toe, the welds must be of structural quality;mere “stitching” is not satisfactory.Intermittent fillets as per the accompanyingdiagram and tables are recommended. (Alldimensions in millimetres).

Where concentrated forces are carried(cross-beams, partitions, etc.), the weldsshould be as for supports, with one short“miss” length each side of the weld length.For compound sections used as columns,the weld lengths given in the table can behalved, leaving the “miss” lengths as forbeams.

Welding

Weld top and bottomCOMPOUND BEAM

Weld

DepthD

At support Running Intermittent Weld

Miss MissMiss Weld Weld Weld

Depth ofSection 'D'

Weld Miss Weld Miss

Running Intermittent FilletAt Supports

Up to 40 45

70

90

120

180

220

260

20

30

40

60

90

110

130

20

30

40

50

60

70

80

40

50

70

100

120

150

180

41 - 60

61 - 80

81 - 110

111 - 160

161 - 210

211 - 260

Intermittent Welds for Compound Sections

Lengths of Intermittent Welds for Compound Sections

The above information is given for users’ convenience as cold formed sections are supplied only in single lengths, i.e.not attached to each other in any way.

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WeldingTypical Welded Section Configurations

Product Descriptions All descriptions, specifications, illustrations, drawings, data, dimensions and weights contained this catalogue, all technical literature and websites containing information from BlueScope Lysaght are approximations only. They are intended by BlueScope Lysaght to be a general description for information and identification purposes and do not create a sale by description. BlueScope Lysaght reserves the right at any time to:

(a) supply Goods with such minor modifications from its drawings and specifications as it sees fit; and

(b) alter specifications shown in its promotional literature to reflect changes made after the date of such publication.

Disclaimer, warranties and limitation of liabilityThis publication is intended to be an aid for all trades and professionals involved with specifying and installing LySAGhT products and not to be a substitute for professional judgement.Terms and conditions of sale available at local BlueScope Lysaght sales offices.Except to the extent to which liability may not lawfully be excluded or limited, BlueScope Steel Limited will not be under or incur any liability to you for any direct or indirect loss or damage (including, without limitation, consequential loss or damage such as loss of profit or anticipated profit, loss of use, damage to goodwill and loss due to delay) however caused (including, without limitation, breach of contract, negligence and/or breach of statute), which you may suffer or incur in connection with this publication.© Copyright BlueScope Steel Limited 11 January 2010

For technical information, contact steeldirect@bluescopesteel.com or call 1800 641417

www.lysaght.com Please check the latest information which is always available on our website.lysaght is a registered trademark of Bluescope steel limited, aBN 16 000 011 058. the lysaght ® range of products is made by Bluescope steel limited trading as Bluescope lysaght.

the sections are cold roll-formed from quality Bluescope lysaght strip to ensure consistent dimensions and conformance to tolerances.Bluescope lysaght’s cold formed steel channels and angles are available either zinc coated or uncoated in base metal thicknesses (BMt) of 1.0 mm, 1.6 mm, 2.5 mm and 3.0 mm depending on the section type. the materials used are zinc coated steel to as 1397 – 2001 g300 – Z275 (300 MPa minimum yield stress, 275g/m2 minimum average coating mass) and uncoated steel to as/NZs 1594-2002 ha300 (300 MPa minimum yield stress).this publication supersedes “Cold Formed steel Channels and angles – load Capacity tables and Welding Data” (Ref. No. CFs II – 1 april 1980).Performance is backed by Bluescope lysaght with over 150 years experience in building products.