Introduction to Steelwork Design to BS 5950-1:2000

Introduction to Steelwork Design to BS 5950-1:2000
A G J Way MEng CEng MICE
and the late
P R Salter BSc CEng MIStructE
The Steel Construction Institute
Commentaries to Standards
Contents
Page No.
FOREWORD iii
SUMMARY viii
1 INTRODUCTION TO BS 5950-1:2000 AND LIMIT STATE CONCEPT 1
1.1 Introduction 1
1.2 Aims of structural design 2
1.3 Methods of design 2
1.4 Limit states design 3
1.5 Limit states 6
1.6 Ultimate limit states 6
1.7 Serviceability limit states 16
1.8 Summary of design procedure 18
2 PROPERTIES OF STEEL 19
2.1 Introduction 19
2.2 Strength 21
2.3 Brittle fracture 21
3 LOCAL BUCKLING AND SECTION CLASSIFICATION 24
3.1 Introduction 24
3.2 Section classification 24
3.3 Section classification examples 28
3.4 Effective section properties 31
3.5 Examples of effective section property calculation 36
3.6 Summary of design procedure 39
4 TENSION MEMBERS 41
4.1 Introduction 41
4.2 Material properties 41
4.3 Effective area in tension 42
4.4 Allowance for eccentricity 43
4.5 Summary of design procedure 45
5 COMPRESSION MEMBERS 46
5.1 Introduction 46
5.2 Slenderness 46
5.3 Effective length 46
5.4 Compressive strength 48
5.5 Section classification 50
5.6 Members in lattice frames and trusses 51
5.7 Members in continuous construction 51
5.8 Summary of design procedure 51
6 RESTRAINED BEAMS 53
6.1 Introduction 53
6.2 Lateral restraint 53
6.3 Section Classification 54
6.4 Shear 54
6.5 Combined bending and shear 55
6.6 Web bearing and buckling 57
P325: Introduction to Steelwork Design to BS 5950-1:2000
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Created on 22 July 2009
This material is copyright – all rights reserved. Use of this document is subject to the terms and conditions of the Steelbiz Licence Agreement
P325: Introduction to Steelwork Design to BS 5950-1:2000
Discuss me …
Created on 30 March 2011
This material is copyright – all rights reserved. Use of this document is subject to the terms and conditions of the Steelbiz Licence AgreementP:\PUB\PUB800\SIGN_OFF\P325\P325V01d12.doc vi Printed 20/08/03
6.7 Deflection 57
6.8 Summary of design procedure 58
7 UNRESTRAINED BEAMS 60
7.1 Introduction 60
7.2 Factors influencing buckling resistance 61
7.3 Behaviour of beams 61
7.4 Design requirements 62
7.5 Effective length 64
7.6 Equivalent uniform moment factor 67
7.7 Deflection 71
7.8 Summary of design procedure 71
8 BEAM WEB DESIGN 72
8.1 Introduction 72
8.2 Web subject to concentrated loads 72
8.3 Openings in beam webs 75
9 MEMBERS SUBJECT TO AXIAL LOAD AND BENDING 79
9.1 Introduction 79
9.2 Section classification 79
9.3 Tension members with moments 80
9.4 Compression members with moments 83
9.5 Summary of design procedure 87
10 COLUMNS IN SIMPLE STRUCTURES 90
10.1 Introduction 90
10.2 Section classification 91
10.3 Column moments 91
10.4 Effective length of columns 93
10.5 Slenderness 93
10.6 Compressive strength 93
10.7 Buckling resistance 93
10.8 Interaction 94
10.9 Loads and forces 94
10.10 Summary of design procedure 95
11 CONNECTIONS 96
11.1 General 96
11.2 Bolted connections 100
11.3 Welded connections 108
11.4 Baseplates 113
11.5 Summary of design procedure 115
12 PLASTIC DESIGN OF PORTAL FRAMES 116
12.1 Introduction 116
12.2 Plastic analysis 116
12.3 Frame stability 117
12.4 Deflections 122
12.5 Member Stability 123
12.6 Summary of design procedure 127
13 PLATE GIRDERS 128
13.1 Introduction 128
13.2 General considerations 129
P325: Introduction to Steelwork Design to BS 5950-1:2000
Discuss me …
Created on 22 July 2009
This material is copyright – all rights reserved. Use of this document is subject to the terms and conditions of the Steelbiz Licence Agreement
P325: Introduction to Steelwork Design to BS 5950-1:2000
Discuss me …
Created on 30 March 2011
This material is copyright – all rights reserved. Use of this document is subject to the terms and conditions of the Steelbiz Licence AgreementP:\PUB\PUB800\SIGN_OFF\P325\P325V01d12.doc vii Printed 20/08/03
13.3 Design strength 129
13.4 Minimum requirements for webs 130
13.5 Moment capacity 131
13.6 Shear buckling resistance 133
13.7 Stiffeners 137
13.8 Loads applied between stiffeners 142
13.9 Summary of design procedures 143
14 CONTINUOUS MULTI-STOREY FRAMES 144
14.1 Introduction 144
14.2 Loading 145
14.3 Frame analysis 146
14.4 Connection properties 146
14.5 Frame classification 146
14.6 Elastic design of continuous multi-storey frames 147
14.7 Plastic design of continuous multi-storey frames 156
14.8 Summary of design procedure 156
15 CRANE GANTRY GIRDERS 158
15.1 Introduction 158
15.2 Crane girder loading 158
15.3 Lateral torsional buckling 162
15.4 Web shear 162
15.5 Local compression under wheels 162
15.6 Welding 163
15.7 Deflection limits 163
15.8 Summary of design procedure 163
16 REFERENCES 164
APPENDIX A: Plastically designed portal frame (Worked Example) 169
A.1 Frame dimensions and loading 169
A.2 Selecting initial member sizes 169
A.3 Design checks 170
A.4 Graphs for initial portal frame member selection
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