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  • SCI PUBLICATION 080

    Fire Resistant Design of Steel Structures- A Handbook to BS 5950 : Part 8

    Brandsichere Bemessung won Stahlkonstruktionen in Handbuch zu BS 5950: Teil8

    Dimensionnement pour la Resistance au Feu des Structures en Acier. Un Manuel pour la BS 5950: Partie 8

    Disefio de Estructuras de Acero Resistentes a1 Fuego Un Manual de la BS 5950: Parte 8

    Progetto di Strutture in Acciaio Resistenti a1 Fuoco Un Manuale per IApplicazione delle BS 5950: Parte 8

    R M LawSon BSc(Eng), PhD, ACGI, CEng, MICE, MlStructE

    G M Newman BSc(Eng), CEng, MIstructE, MSFSE

    ISBN 1 870004 48 5

    0 The Steel Construction Institute 1990

    The Steel Construction Institute Silwood Park Ascot Berkshire SL5 7QN Telephone: 0990 23345 Fax: 0990 22944 Telex: 846843

    P080: Fire resistant design of steel structures - A handbook to BS 5950: Part 8

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    P080: Fire resistant design of steel structures - A handbook to BS 5950: Part 8

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  • FOREWORD

    This publication has been prepared to assist designers and others involved in evaluating the fire resistance of steel structures. It follows the recently published BS 5950: Structural use of steelwork in building, Part 8: Code of practice for fire resistant design and describes the background to the clauses in the standard. The Handbook was written by Dr R M Lawson and Mr G M Newman of the Steel Construction Institute. Much of the information used was provided during the course of preparing the standard, and the authors are grateful to the Chairman of the Drafting Panel of BS 5950: Part 8, Mr J T Robinson, and its secretary, Mr A Weller for their assistance at this stage. The following members of the Committee and other experts commented on the Handbook in its draft form:

    Dr G M E Cooke Fire Research Station Dr M Edwards British Steel (Tubes Division) Dr B R Kirby British Steel (Swinden Laboratories) Dr S J Melinek Fire Research Station Mr J T Robinson British Steel (General Steels)

    The work leading to this publication was funded by British Steel plc (General Steels - Sections). Fire test data was provided by courtesy of British Steel Technical (Swinden Laboratories).

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    P080: Fire resistant design of steel structures - A handbook to BS 5950: Part 8

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  • CONTENTS

    SUMMARY V

    1. INTRODUCTION 1 .l Introduction to the publication 1.2 Introduction to fire safety 1.3 Scope of the Code 1.4 Definitions

    2 FIRE LIMIT STATES 2.1 Fire Resistance Test 2.2 Load factors 2.3 Material factors

    3 PROPERTIES OF STEEL AND OTHER MATERIALS IN FIRE 3.1 Physical properties of steel 3.2 Strength reduction factors for structural steels 3.3 Selection of appropriate strain limits 3.4 Behaviour of other steels and materials in fire

    4 THERMALRESPONSEOFPROTECTEDANDUNPROTECTEDSTEEL MEMBERS 4.1 Section factors 4.2 Theoretical behaviour of unprotected steel sections in fire 4.3 Design temperatures in unprotected columns and beams 4.4 Theoretical behaviour of protected steel sections in fire 4.5 Traditional and modern fire protective materials 4.6 Partial protection to bare steel beams and columns 4.7 Computer methods for predicting thermal response

    5 EVALUATION OF FIRE RESISTANCE 5.1 Performance derived from fire tests 5.2 Performance of unprotected members derived from fire tests 5.3 Calculation methods for evaluating fire resistance 5.4 Fire resistance provided by generic forms of fire protection

    6 LIMITING TEMPERATURE METHOD 6.1 General 6.2 Critical elements 6.3 Load ratios 6.4 Background to limiting temperatures 6.5 Behaviour of columns in frames

    7 MOMENT CAPACITY APPROACH 7.1 General approach 7.2 Use of the moment capacity method for simple beams 7.3 Application to particular structural forms

    7 7 9 14 15

    19 19 27 28 31 33 33 34

    35 35 35 39 40

    43 43 44 44 46 50

    51 51 52 53

    111 ...

    P080: Fire resistant design of steel structures - A handbook to BS 5950: Part 8

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  • 8 EFFECT OF FIRE PROTECTIVE MATERIALS 8.1 Performance of traditional materials 8.2 Performance of proprietary fire protective materials 8.3 Design formula for determining thickness of fire protection 8.4 Determination of material properties

    9 BEHAVIOUR OF COMPOSITE DECK SLABS 9.1 Minimum slab depths 9.2 Review of test data 9.3 Fire engineering method 9.4 Simplified method 9.5 Composite beams

    10 SHELF ANGLE FLOORS 10.1 Review of test data 10.2 The temperature distribution in shelf angle floor beams 10.3 Strength of shelf angle floor beams

    11 STRUCTURAL HOLLOW SECTIONS 1 1 .l General 1 1.2 Concrete-filled structural hollow sections 1 1.3 Water-filled sections

    12 BEHAVIOUR OF OTHER ELEMENTS AND STRUCTURES 12.1 Portal frames 12.2 Connections in frames 12.3 Castellated beams 12.4 Walls and roofs 12.5 Ceiling 12.6 Bracing 12.7 External steelwork 12.8 Escape stairways

    13 NATURAL FIRES 13.1 Important parameters in determining fire temperatures 13.2 Concept of time-equivalent 13.3 Fire loads in buildings 13.4 Temperatures in steel sections in natural fires 13.5 Influence of active protection measures

    14 RE-USE OF STEEL AFTER A FIRE 14.1 Mechanical properties 14.2 inspection and appraisal 14.3 Re-use of steel structures

    54 54 56 60 62

    65 65 66 69 70 71

    73 73 75 76

    79 79 79 85

    86 86 88 91 91 92 92 93 93

    94 94 98 99 100 100

    102 102 103 103

    REFERENCES 105

    APPENDIX Design examples 109

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    P080: Fire resistant design of steel structures - A handbook to BS 5950: Part 8

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    P080: Fire resistant design of steel structures - A handbook to BS 5950: Part 8

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  • SUMMARY

    Fire Resistant Design of Steel Structures A Handbook to BS 5950: Part 8

    This publication covers the means of achieving the required fire resistance of steel structures used in building. It follows BS 5950: Part 8 Code of Practice for Fire Resistant Design (1990), and describes the background to the Code Clauses. The publication is p

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