LYSAGHT BONDEK® 2003BSSoftware User’s GuideGetting exceptional results from BONDEK 2003BS

BONDEK 2003BS

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© Copyright 2003 by BlueScope Steel Limited.

All rights reserved. No part of this brochure may be reproduced, stored in aretrieval system, or transmitted in any form or by any means, electronic,mechanical, recording or otherwise, without written permission of BlueScopeSteel Limited.

LYSAGHT® and BONDEK® are trademarks of BlueScope Steel Limited ABN 16 000 011 058.

www.bluescopesteel.com

PREFACE

COPYRIGHT INFORMATION

DISCLAIMER, WARRANTIES, LIABILITY

BONDEK 2003BS software is a user-friendly Excel-based software for the design ofcomposite concrete slabs with LYSAGHT BONDEK structural decking. It is suitablefor steel frame and masonry wall construction. BONDEK 2003BS software is developed to British Standards.It is a tool developed with latest information to assist a competent engineerwith the most competent solution. The software shall be used with BONDEK profile sheeting in conjunction theBONDEK Design and Construction Guide for structural decking for compositeconcrete slabs.

This publication is intended to be a design aid for professional engineers andis not a substitute for professional judgment.Except to the extent to which liability may not be lawfully be excluded orlimited, BlueScope Steel Limited will not be under or incur any liability to youfor any direct or indirect loss or damage (including, without limitation,consequential loss or damage, such as loss of profit or anticipated profit, lossof data, loss of use, damage to goodwill and loss due to delay) howevercaused (including, without limitation, breach of contract, negligence and/orbreach of stature), which you may suffer or incur in connection with thispublication or the software.Published by BlueScope Lysaght © BlueScope Steel Limited 2003Produced at BlueScope Lysaght, Technology.

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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2. Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

2.1 Computer requirements . . . . . . . . . . . . . . . . . . . . . . . . . .5

2.2 Installing BONDEK 2003BS . . . . . . . . . . . . . . . . . . . . . . . . .5

3. Software flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64. BONDEK 2003BS menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

5. Input dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

5.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

5.2 Conditions of exposure . . . . . . . . . . . . . . . . . . . . . . . . . .8

5.3 Spans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

5.4 Composite slab deflection limits . . . . . . . . . . . . . . . . . .10

5.5 Crack control for flexure . . . . . . . . . . . . . . . . . . . . . . . .10

5.6 Creep and shrinkage factors . . . . . . . . . . . . . . . . . . . . .10

5.7 Properties of materials . . . . . . . . . . . . . . . . . . . . . . . . . .11

5.8 Degree of moment redistribution . . . . . . . . . . . . . . . . .12

5.9 Fire Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

5.10 Shrinkage reinforcement . . . . . . . . . . . . . . . . . . . . . . .12

5.11 Loading parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

6. Design dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

6.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

6.2 Slab span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

6.3 Formwork deflection limits . . . . . . . . . . . . . . . . . . . . . .16

6.4 Support width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

6.5 Live load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

6.6 Fire design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

7.Design/Check dialog box . . . . . . . . . . . . . . . . . . . . . . . . . . .18

7.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

7.2 Slab thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

8. Results window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

8.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

9. Warning messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

10. Sample report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

CONTENTS

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INTRODUCTION1This User’s Guide is designed to provide you with basic familiarityabout BONDEK 2003BS software to enable you to quickly understandand start using the software. The software is able to perform majortasks normally performed at structural consultant’s office. Use BONDEK

2003 Design and Construction Guide with its set of tables. Whenrequired input parameters are different from those listed for tables orthe user wants to check several different options, the software will helpwith that.The software offers following additional design options as comparedto tables:• Two major design options: Design and Design/Check. The first

option will perform design with the minimum possible slabthickness; the second one will check the chosen slab thicknessand design the rest of parameters.

• Other than mild exposure classification• C35 and C40 concrete grades• Superimposed dead load other than 1 kPa• Other than office types of imposed loads• L/500 imposed loads deflection limit for composite slab design• Equal spans• For negative, positive fire and shrinkage reinforcement, use

460B grade reinforcement in accordance to BS4449:1997 and460B tables in accordance to BS4483:1998 (or in anycombination)

• Specified number of continuous spans (two-span, three-spanetc.).

• Shrinkage and creep factors other than for indoor conditions• All fire rating periods: 30, 60, 90, 120, 180 and 240 min.• Variable loads due to weight of stacked materials during

construction stage.• Design with no crack control requirements over supports• Different degree of moment redistribution for top tensile

reinforcement• Support width

The software is developed as a powerful tool to minimize time andefforts necessary by a consulting engineer to complete the job.However, it is essential for the user to have:• Good knowledge of structural engineering• Familiarity with design of composite concrete slabs• Sound knowledge of local regulations and load parameters

This warning symbol means the user shall take carebefore proceeding further.

This symbol means that there is more information on thistopic in other chapters.

This symbol means that the user shall refer to therelevant British Standards for more information.

This symbol means that this is important information. The user shall ensure they understand before proceeding.

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HELP

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GETTING STARTED22.1 COMPUTER REQUIREMENTS

2.2 INSTALLING BONDEK 2003BS

To run BONDEK 2003BS your computer must have Microsoft Excel 2000 or alater version, on Windows platform.It is recommended to run the software on a PC with at least 200 MHzprocessor and 64 MB main memory.

The BONDEK 2003BS CD is fixed on the inside back cover of this Guide. It contains BONDEK 2003BS Excel file, User’s Guide and Design andConstruction Guide in ‘.pdf’ format.On your hard disc, create a directory (folder) called BONDEK 2003BS, andplace the files from CD into the folder. Run the software, in the usual way, bydouble-clicking on the icons.

Ensure you enable Macros before proceeding with BONDEK 2003BS. Thesecurity settings for Excel shall be set to medium level when applicable.

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SOFTWARE FLOWCHART FOR THE DESIGN OFCONTINUOUS SPANS

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Specify parameters in Input dialog box

for End Span

Slab thickness known?

Specify parameters in Design dialog box

and click Design

Specify parameters in Design/Check

dialog box and click Design/Check

NO

NONO

NO

YES

YES

YES

YES

The design output is satisfactory (passed)

and economical?

The design output is satisfactory (passed)

and economical?

Less than five spans

Repeat above procedure for one Interior Span withthicknesses required for

End Span using Design/Check

dialog box.

Repeat above procedure for Interior Spans using either

of these two options– the same thickness as for End Span,

using Design/Check dialog box– minimum thickness using

Design dialog box

Repeat above procedure for one Interior Span

(Equal Span)or several Interior Spans.

END ENDEND

Revise

input parameters Revise input parameters

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HELP

HELP

BONDEK 2003BS MENU4BONDEK 2003BS Menu options are built into Excel Menu on the top of thescreen.Excel Menu may look different from what is shown below.There are three Menu options:• Analyse (BONDEK)• Print (BONDEK)• Report (BONDEK)

Figure 1Analyse Menu

Figure 2Print (BONDEK) Menu

Figure 3Report (BONDEK) Menu

Analyse (BONDEK) Menu has three submenu options:• Input• Design• Design/CheckThese options will be described in details in further chapters.

When the software is opened, the Input dialog box will appear on the screenautomatically (see cover page). For the second and consecutive runs, theuser shall access the Input dialog box through Menu.

Print (BONDEK) Menu allows the user to print Output/Input information orReport.

Report (BONDEK) Menu will generate detailed design report which isdescribed in more details in Chapter 10.

It shall be noted that BONDEK Menu options are available only when BONDEK

2003BS Excel file is activated.

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!

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INPUT DIALOG BOX55.1 GENERAL

5.2 CONDITIONS OF EXPOSURE

5.3 SPANS

Input dialog box is designed for quick and easy data entry. The user shallnormally just chose one of available options. No blank boxes shall be left.If some of boxes are left blank the warning message would appear on thescreen.

Conditions of exposure shall be specified as required by BS 8110:Part1:1997 Table 3.2.Normally, Mild conditions would correspond to indoor environment.Moderate or Severe are relevant to outdoor environment.

Figure 4Conditions of exposure

Figure 5Spans

Figure 6Continuous Spans

The user may specify Single or Continuous spans depending on theproject. It is a common practice to design continuous slabs as a seriesof single spans. Minimum nominal reinforcement at intermediatesupports shall be specified in this case in accordance to BS5950: Part4: 1994, Clause 6.8. It shall be noted that nominal reinforcement willnot prevent formation of wide cracks over supports - requirements ofBS8110: Part 1, 1997, Clause 3.5.8 for crack control will not besatisfied.Increased slab thickness may be required in many instances whencontinuous slabs are designed as a series of simply supported spans.If the span is a Continuous one, the user may run the software twice:for End Spans and Interior Spans separately. If the continuous span isa Two spans then there is no option for Interior Spans, both spans areend ones. It shall be noted that Continuous spans refer here tocomposite concrete slabs only, BONDEK formwork spans are shown inBONDEK Design and Design/Check dialog boxes.End Spans and Interior Spans may be designed with a differentthickness to get the most economical design. However, The firstInterior Span from the end support shall always have the samethickness as the End Span.

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Figure 7Spans

Figure 8Spans

Figure 9Ratio of Spans

When the slab has less than five spans the user shall run End Spans firstusing Design Menu option to get the minimum possible slab thickness. ThenInterior Spans shall be designed with the slab thickness obtained for EndSpans using Design/Check Menu option. When the slab has five or more spans, the thickness of Interior Spans otherthan first Interior Span may be specified independently from End Spans.See flowchart.

End Span Interior Span

End span negative reinforcement

Interior span negative reinforcement

End and Interior Spans are the same thickness

BONDEK

End Span First Interior Span Interior Span

BONDEK

Interior span reinforcement Max as required for adjacent spans

Slab thickness of Interior Spans may be reduced

The user may specify all spans as equal spans and with maximum Ratio oflonger to shorter adjacent slab spans of 1.2. The software options for irregular lay outs with higher ratios of adjacentspans is not currently available, contact LYSAGHT TECHNOLOGY for moreinformation.

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5.5

CREEP AND SHRINKAGE FACTORS5.6

CRACK CONTROL FOR FLEXURE

5.4 COMPOSITE SLAB DEFLECTION LIMITS

The software is developed for Span/250 Composite slab deflection limitsdue to total load and two options for deflections limits due to imposedloads:• Span/350 or 20 mm whichever is less is recommended by

BS 5950:Part4:1994 Chapter 6.6.1• More strict deflection limit of Span/500 or 20 mm whichever is less

is recommended by BS 8110: Part2:1985 Chapter 3.2.1.2. Thisnormally applies for concrete slabs which support brittle partitionslike masonry walls, glass doors.

The software is developed to limit flexural cracks to a width of maximum0.3mm over supports.If cracks are not a concern for the user, the Not required option can beused, this may result in less negative reinforcement over supports.

Figure 10Composite slab deflection limits

Figure 11Crack control for flexure

Figure 12Creep factor

Figure 13Shrinkage factor

Creep and shrinkage factors are necessary for the software to calculatethe composite concrete slab deflections. The suggested factors forindoor and outdoor conditions are indicative only.

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PROPERTIES OF MATERIALS5.7

Figure 14Concrete grades

Figure 15Tensile and compressionreinforcement

Figure 16Bar sizes

Figure 17BONDEK metal thickness

The user shall define these factors allowing for the slab thickness andenvironmental conditions as defined in BS 8110:Part 2:1985, Chapters 7.3and 7.4. It shall be noted that effective slab thickness shall allow for thebeneficial fact that bottom concrete slab surface is completely covered bythe BONDEK sheeting.

The minimum Concrete grade possible depends on Conditions of exposure.For instance, only Concrete Grade C40 will be available if Severe Exposurecondition is specified.

Tensile and compression reinforcement can be specified as 460B Mesh or460B bars. More detailed information about these reinforcement grades maybe found in BS 4449:1997 and BS 4483:1998.The set of available Bar sizes is different for each of these options:

The detailed definition of Tensile & compression reinforcement and itslocation within the composite concrete slab is given in Chapter 8.HELP

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DEGREE OF MOMENTREDISTRIBUTION

5.8

There are two BONDEK base material thicknesses (BMT): 0.75 and 1.0 BMT.The user may try 0.75 BMT for the first run. If the design is noteconomical (props are necessary), next run with increased BMT may benecessary.

Normally, the Degree of moment redistribution is specified as 30%. Where the structure designed is over four storeys and where the structuralframe provides lateral stability the Degree of moment redistribution shallbe limited to 10%.

For more information refer to BS 8110:Part1:1997 Chapters 3.2.2.1 and3.2.2.2.

Figure 18Degree of moment redistribution

Figure 19Fire Design

Figure 20Shrinkage reinforcement

FIRE DESIGN5.9

SHRINKAGE REINFORCEMENT5.10

At this stage the user shall specify if the Design for fire is required. If so,the Fire reinforcement grade and Fire bar size shall be entered by theuser in the same way as for Tensile & compression reinforcement.

The detailed definition of Fire reinforcement and its location within thecomposite concrete slab is given in Chapter 8.

This reinforcement is necessary to control shrinkage and temperatureeffects.

Shrinkage reinforcement diameter is not an input option, however it shallnot exceed the diameter of negative reinforcement.

Minor Degree of shrinkage control is more than adequate as perBS5950:4:1994. Clause 6.9. The user may choose more strict Degree ofshrinkage control to get better durability performance.

The detailed definition of Shrinkage reinforcement and its location withinthe composite concrete slab is given in Chapter 8.

HELP

HELP

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Figure 21Superimposed dead load

Figure 22ψs load factor

LOADING PARAMETERS5.11

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Superimposed dead load (G) is a load of permanent nature in addition to selfweight of composite concrete slabs.

For more information refer to BS 6399:Part1:1996 Chapters 3.1 and 4.

ψs is a factor for Live (Imposed) Loads. Live Load itself shall be entered inDesign or Design/Check dialog boxes which are described in next Chapters.This is the proportion of the Live Load which shall be considered aspermanent for deflection calculations.For more information refer to BS 8110:Part2:1985 Chapter 3.3.3.

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Figure 23Stacked materials

This is a weight of Storage loads as specified in BS 5950:Part4:1994Chapter 2.2.3.2 during construction stage before concrete is placed. Theload shall not be confused with Basic construction loads given in Chapter2.2.3.1 of the same Standard. The Standard does not specify the value ofthe Storage load, so 4 and 1 kPa options are available based on AustralianStandards. If 1 kPa is specified, it is recommended to control that load onconstruction site and include that information on design documentation.

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Figure 24Design dialog box

DESIGN DIALOG BOX66.1 GENERAL

When the user entered all necessary parameters in the Input dialog box, thenext step would be to click Design or Design/Check button at the bottom ofthe Input dialog box. This will open one or another dialog box. The Designoption is used when the user wants to design the slab to the very minimumslab thickness. Design/Check option shall be used when the particular slabthickness shall be checked and designed. (See flowchart.)

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6.2 SLAB SPAN

6.3 FORMWORK DEFLECTION LIMITS

6.4 SUPPORT WIDTH

The user shall type in the span. It shall be centre to centre span, seeChapter 8 of this Guide for more details. The range of possible spansis from 1.8 to 6m.

Figure 25Slab span

Figure 26Formwork deflection limits

Figure 27Support width

The Formwork deflection limits required by BS 5950:Part4:1994 Chapter5.3 is Span/130. The software has an additional more strict option ofSpan/250. The last option will result in a minimum formwork saggingwhich is definite architectural advantage for open (no ceilings) slab soffits.

This is a width of a supporting structure – masonry walls or steel beams. Itis important to enter correct value – it may result in less BMT of theBONDEK formwork.

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!

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6.5 LIVE LOAD

6.6 FIRE DESIGN

Figure 28Live load

Figure 29Fire design

Figure 30Load factor for imposed load

Live Load (Q) shall be specified as required by BS 6399:Part1:1996 Chapters3.2 and 5 for Imposed floor and ceiling loads.

The user may specify Fire-resistance periods of 30, 60, 90, 120, 180 and240 minutes as defined by BS 5950-8:1990 Chapter 4.9.

The Load factor for imposed loads shall be specified as defined by 5950-8:1990 Table 2

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HELP

DESIGN/CHECK DIALOG BOX77.1 GENERAL

Figure 31Design & Design/Check Options

Figure 32Design/Check dialog box

When the user entered all necessary parameters in the Input dialog box,the next step would be to click Design or Design/Check button at thebottom of the Input dialog box. This will open one or another dialog box.The Design option is used when the user wants to design the slab to thevery minimum slab thickness. Design/Check option shall be used whenthe particular slab thickness shall be checked and designed. It may be ina case when the architect specified the slab thickness for other thanstructural reasons or Interior spans shall be designed to the slab thicknessas required for End spans – see Chapter 5.3 of this Guide and theflowchart.

This Dialog box has the same options as Design dialog box with anaddition of Slab thickness option.

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7.2 SLAB THICKNESS

Figure 33Slab thickness

The slab thickness may vary from 105 to 250 mm. The user shall type in thenecessary slab thicknesses. Slabs thicknesses of more than 250 mm areconsidered as not practical. LYSAGHT’s Decking Asia shall be contacted todesign slabs with more than 250 mm thickness. (Contact details are on backcover.)

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RESULTS WINDOW88.1 GENERAL

The Results window will appear on the screen automatically when theuser clicks the Design or Design/Check buttons on the relevant Dialogbox. Alternatively, the window may be opened by clicking on the Resultsworksheet at the bottom of the Excel window.

The window shows the design summary (Design Output) and the list ofentered parameters in Input, Design or Design/Check dialog boxes(Input parameters).

Figure 34Results window

Use Analyse Menu on the top of the screen to open dialog boxes againProject Name: BONDEK 2003BS Version 1

Roof SlabDesign Output

SpansParameter Notations Single End Interior

Slab thickness D,cs (mm) 170

Top tensile reinforcement over supports: A-s (mm2) 360

Pattern of negative reinforcement Pattern 1

Concrete cover c (mm) 35Transverse reinforcement to controlshrinkage and temperature effects Ashr (mm2) 360

Fire reinforcement (additional toshrinkage and negative reinforcement) Afire (mm2) 880

Compression reinforcement: Top at midspan Acom,mid (mm2) 0

Compression reinforcement: Bottom at support Acom,sup (mm2) 0

Number of temporary props 1Nominal continuity reinforcement over supports Anom,cont (mm2) Not applicable

Input parameters

Type of Buildings Steel-Frame Tensile & Compression Reinf. 460B

Span Configuration End Spans Tensile & Comp. Reinf. Diameter 10 mm

Continuous Spans Three spans Bondek sheeting 1 mm

Conditions of Exposure Moderate Slab thickness, mm -

Max. ratio of adjacent spans Ll/Ls 1 Q live load, kPa 2

Deflection Limits of G superimposed dead load, kPa 1

Composite Slabs Total<L/250 Imposed<L/350 ψσ 0.25

Centre to centre composite Q weight of stacked materials

slab span, mm 4400 (construction stage 1), kPa 4

Formwork Deflection Limits L/130 Fire Design Required

Support width of steel frame Fire Resistance Periods 240 min

and masonry supports, mm 100 Fire imposed load factor 0.8

Degree of moment redistribution "10%" Fire Reinforcement Grade 460B

Crack control for flexure Required Fire Reinforcement Diameter 10 mm

Concrete grade C35 Crack control for shrinkage

Creep factor 2.75 and temperature effects Moderate

Shrinkage factor 0.00035 Shrinkage Reinforcement Grade 460B Mesh

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The reinforcement types in the Design Output table is explained in thefollowing Figures:

Figure 36Pattern 1 of top tensile (negative) reinforcement

Figure 35Slab cross section

Reinforcementdepth

Concretecover

Concrete

Deformed barreinforcement

Dep

th o

fco

mpo

site

sla

b

Longitudinal reinforcement(parallel with ribs)

Transverse reinforcement(90° to ribs)

Top-facereinforcement

Bottom-facereinforcement

BONDEK

Little or norestraint atend support

0.3Ln

Negativereinforcement

Bondek

Ln Ln

Restraint atend supportby mass of wall

Continuous overinterior support

0.3Ln

0.3Ln

L (span)

Concrete slab

Wal

l

Wal

l

Cover

Wal

l

Wal

l

L (span)

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Figure 37Pattern 2 of top tensile (negative)reinforcement

Figure 38Fire reinforcement

Pattern 2 negative reinforcement shall be specified when live load ismore than twice the dead load.It shall be noted that top tensile(negative) (Continuous spans) and shrinkage reinforcement will bedesigned by the software at all times.Additional fire reinforcement may not be necessary.xb should not be less than 30 mm.

Compression reinforcement and bottom tensile reinforcement (additionalto BONDEK) are very rare design cases and may be designed by thesoftware for very high Live Loads and Superimposed Dead Loads.

Little or norestraint atend support

0.3Ln

BONDEK

Ln Ln

Restraint atend supportby mass of wall

Continuous overinterior support

0.3Ln

0.3Ln

L (span)

Concrete slab

Wal

l

Wal

l

CoverW

all

Wal

l

L (span)

1/3 of negativereinforcement

0.3 Ln

L

BONDEK

Concrete

Bondek

Concrete

d +

Dxb xbyb

Ast, transverse

Ln

Ast– Ast.f

+

Ast– Ast.f

+

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WARNING MESSAGES9

Slab can not be designed to specified thickness

This message means that the minimum possible slab thickness shall be morethan specified by the user using Design/Check option. The user may:• Increase slab thickness specified using Design/Check option• Reduce minimum required slab thickness by:• Increasing concrete grade• Decreasing Tensile and Compression reinforcement bar size• Increasing slab deflection limit to L/350impAll input parameters shall be checked if adequate.

Slab thickness shall be written within 105mm to 250mm

This means that slab thickness entered is not correct.250 mm is considered as the maximum practical slab thickness. Contact DECKING ASIA (contact details on back cover) to design thickerslabs.

This means that the slab span entered is outside allowed limits.

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!

Tensile & compression reinforcement bar size have not been entered

Self explanatory.

Fire reinforcement bar size have not been entered

Self explanatory.

Specify correct number of spans for continuous slabs

That message may appear when the user designs first continuous span as anend double span and then tries to design interior span (as double span). Theinterior span shall be specified for continuous slabs with three or more spans.

1 kPa stacked materials Load shall be clearly specified on formworkdocumentation. Continue?

The user may chose Yes and continue with the design. However, 1 kPa loadshall be clearly specified on design documentation and controlled on aconstruction site.

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REPORT - SAMPLE PAGES10

BONDEK to British Standards

Job Name: Bondek typical

INPUT PARAMETERS:

Type of building Steel-FrameConcrete slab spans End SpansContinuous spans Three spansSlab thickness Dc mm 170Density of concrete: rg kN/m3 23Concrete grade C35Concrete slab span, centre to centre L mm 4400Conditions of exposure Moderate

(BS 8110:Part 1:1997, Table 3.2)Reinforcement grade 460BReinforcing bar diameter mm 10Deflection limits of composite slabs Total<L/250 Imposed<L/3

(BS 5950:Part 4:1994, Clause 6.6.1)(BS 8110:Part 2:1985, Clause 3.2.1.2)

Maximum ratio of longer to shorter spans up to 1.2Degree of moment redistribution "10%"% of permanent load in the live load 25Degree of control for shrinkage and temperature effects ModerateShrinkage reinforcement grade 460B Mesh

Creep factor ecc 2.75

(BS 8110:Part 2:1985, Sections 7.3)

Shrinkage strain esh 0.00035

(BS 8110:Part 2:1985, Sections 7.4)Flexural crack control RequiredSuperimposed dead load Gsup kPa 1Imposed load Q kPa 2

BONDEK base metal thickness t mm 1Propping No propsSupport width mm 100Formwork deflection limits mm L/130

(BS 5950:Part 4:1994, Cla mm 30Construction imposed loads dueto weight of stacked materials Qs kPa 4

(BS 5950:Part 4:1994, Clause 2.2)

Fire resistance level FRL min 240Fire reinforcement grade 460BFire reinforcement diameter mm 10Load factor for imposed loads during fire 0.8

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Formwork design

SECTION PROPERTIES OF BONDEK:Section Modulus Zf mm3/m 16736.0Effective Second Moment of Areafor serviceability Ieff,ser mm4/m 457750.0

(BS 5950:Part 6:1995, Clause 4.6)Area mm2/m 1678.0

MATERIAL PROPERTIES OF BONDEK:Nominal yield stress Re.min MPa 550.0Nominal ultimate tensile strength Us MPa 550.0

(BS 5950:Part 6:1995, Clause 3.3.2)(AS/NZS 4600:1996, Table 1.5)

Design strength py MPa 462.0(BS 5950:Part 4:1994, Clause 2.4.3)(BS 5950:Part 6:1995, Clause 3.3.2)

Young's modulus of elasticity 210000(BS 5950:Part 4:1994, Clause 2.4.3)

DESIGN LOADS:Dead load of sheeting Gsh kPa 0.1Dead load of concrete with ponding Gdc kPa 4.2Construction imposed loads Qc kPa 2.1Construction imposed loads dueto weight of stacked materials Qs kPa 4.0

LOAD COMBINATIONS:Strength:Stage 1(before placing concrete):

F1a = 1.4*Gsh+1.6*Qc kPa 3.5F1b = 1.4*Gsh+1.6*Qs kPa 6.6

Stage 2(after placing concrete):F2a = 1.4*Gsh+1.4Gdc+1.6*Qc kPa 9.5

Serviseability:Fdef = Gsh+Gdc kPa 4.4

(BS 5950:Part 4:1994, Table1)

DESIGN FOR STRENGTH:Maximum design moment M* kNm/m 4.4Moment capacity Mc kNm/m 7.5

(BS 5950:Part 6:1995, Clause 5.2)M*<MAX(Mc, Mc,lat, Mc,dist) OK

Maximum shear force F*v kN/m 10.2Shear capacity Pv kN/m 42.2

(BS 5950:Part 6:1995, Foreword)(AS/NZS 4600:1996,Clause 3.3.4)F*v<Pv OK

DESIGN FOR SERVICEABILITY:Deflections Dtot mm 7.71

(BS 5950:Part 6:1995, Clause 5.6.1)Deflection limits Dtot,max mm 16.6

Dtot,abs mm 30.0(BS 5950:Part 4:1994, Clause 5.3)Dtot<MIN(Dtot,max Dtot,abs) OK

27

Composite slab design

MATERIAL PROPERTIES:Nominal yield stress of BONDEK Re.min MPa 550Nominal ultimate tensile strength of BOND Us MPa 550

(BS 5950:Part 6:1995, Clause 3.3.2)(AS/NZS 4600:1996, Table 1.5)

Design strength of BONDEK Py MPa 511.5(BS 5950:Part 4:1994, Clause 2.4.3)

Young's modulus of elasticity of steel Es MPa(BS 5950:Part 4:1994, Clause 2.4.3) 210000

Nominal yield stress of reinforcing bars fy MPa 460

k factor (empirical parameter) k N/mm 0.055m factor (empirical parameter) m N/mm2 260

(BS 5950:Part 4:1994, Clause 6.4.1)Short term Young's modulus of elasticity of Ec,s MPa 27000

(BS 8110:Part 2:1985, Sections 3.5;7.2)Long term Young's modulus of elasticity of Ec,l MPa 7200.00

(BS 8110:Part 2:1985, Sections 3.6)

LOADING:Dead load (self weight) G kPa 5.04Superimposed dead load Gsup kPa 1Imposed load Q kPa 2

LOAD COMBINATIONS:Strength: 1) Fu=1.4*G + 1.6*Q (all spans, adjucent, kPa 10.26

1) Fu=1.4*G (the rest of spans) kPa 6.60Serviceability:

1) Fs.G = Gsup (all spans) kPa 1.002) Fs.tot = Gsup + Q (all spans, adjucent kPa 3.002) Fs.tot = Gsup (the rest of spans) kPa 1.003) Fs.perm.short = Gsup + yQ (all spans, kPa 1.50

alternate spans)3) Fs.perm.short = Gsup (the rest of span kPa 1.004) Fs.perm.long = Gsup + yQ (all spans,n kPa 1.50

variation for long term live load)(BS 8110:Part 2:1985, Sections 3.6; 3.3.3)

DESIGN FOR STRENGTH:NEGATIVE MOMENT CAPACITY:

Design moment at support after redistribut Msp** kNm 23.50Negative RIO over support is less than 4% TRUE

(BS 8110:Part 1:1997, Clause 3.12.6.1)Compression RIO over support is not necessary TRUENegative tensile RIO (at the top), including crack requ mm2 440Additional midspan tensile RIO (at the bottom) 0 (BS 8110:Part 1:1997, Table 3.25)

(BS 5950:Part 4:1994, Clause 6.3)(BS 8110:Part 1:1997, Clause 3.4.4)(see also flexural crack control)

POSITIVE MOMENT CAPACITY:Design moment at mid span before redistr Mmid* kNm 18.93Design moment at mid span after redistrib Mmid** kNm 20.04Effective area of sheeting Ash(eff) mm2/m 1678Positive moment capacity M+ kNm 103.76

(BS 5950:Part 4:1994, Clause 6.3)(BS 8110:Part 1:1997, Clause 3.4.4)(AS 3600-1994, Clause 6.1.1.2)

M+>Mmid** TRUE

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