Steel Structures Design Manual to AS 4100 V1

1 Steel Structures Design Manual To AS 4100 First Edition Brian Kirke Senior Lecturer in Civil Engineering Griffith UniversityIyad Hassan Al-Jamel Managing DirectorADG Engineers Jordan Copyright Brian Kirke and Iyad Hassan Al-Jamel This book is copyright. Apart from any fair dealing for the purposes of private study, research, criticism or review as permitted under the Copyright Act, no part may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means electronic, mechanical, photocopying, recording or otherwise without prior permission to the authors. iii CONTENTS_____ PREFACE viiiNOTATION x1 INTRODUCTION.

2 THE STRUCTURAL DESIGNPROCESS 1 Problem Formulation 1 Conceptual Design 1 Choice of Materials 3 Estimation of Loads 4 Structural Analysis 5 Member Sizing, Connections and Documentation 5 2 Steel PROPERTIES 6 Introduction 6 Strength.

3 Stiffness and Density 6 Ductility 6 Metallurgy and Transition Temperature 7 Stress Effects 7 Case Study: King s St Bridge, Melbourne 8 Consistency 9 Corrosion 10 Fatigue Strength 11

4 Fire Resistance 12 References 13 3 LOAD ESTIMATION 14 Introduction 14 Estimating Dead Load (G) 14 Example: Concrete Slab on Columns 14 Concrete Slab on Steel Beams and Columns 16 Walls 17 Light Steel Construction 17 Roof Construction 18 Floor Construction 18 Sample Calculation of Dead Load for a Steel Roof 19 Dead Load on Purlins 20 Dead Load on Rafters 21 Dead Load due to a Timber Floor 22 Worked Examples on Dead Load Estimation 22 Estimating Live Load (Q)

5 24 Live Load Q on a Roof 24 Live Load Q on a Floor 24 Other Live Loads 24 Worked Examples of Live Load Estimation 25 iv Contents Wind Load Estimation 26 Factors Influencing Wind Loads 26 Design Wind Speeds 28 Site Wind Speed Vsit, 29 Regional Wind Speed VR 29 Wind Direction Multiplier Md 30 Terrain and Height Multiplier Mz.

6 Cat 30 Other Multipliers 30 Aerodynamic Shape Factor Cfig and Dynamic Response Factor Cdyn 33 Calculating External Pressures 33 Calculating Internal Pressures 38 Frictional Drag 39 Net Pressures 39 Exposed Structural Members 39 Worked Examples on Wind Load Estimation 40 Snow Loads 47 Example on Snow Load Estimation 47 Dynamic Loads and Resonance 48 Live Loads due to Vehicles in Car Parks 48 Crane.

7 Hoist and Lift Loads 48 Unbalanced Rotating Machinery 48 Vortex Shedding 50 Worked Examples on Dynamic Loading 51 Acceleration Loads 51 Crane Loads 51 Unbalanced Machines 53 Vortex Shedding 54 Earthquake Loads 54 Basic Concepts 54 Design Procedure 55 Worked Examples on Earthquake Load Estimation 56 Earthquake Loading on a Tank Stand 56 Earthquake Loading on a Multi-Storey Building 56 Load Combinations 57 Application 57 Strength Design Load Combinations 57 Serviceability Design Load Combinations 58 References 59 4 METHODS OF STRUCTURALANALYSIS 60 Introduction

8 60 Methods of Determining Action Effects 60 Forms of Construction Assumed for Structural Analysis 61 Assumption for Analysis 61 Elastic Analysis 65 Moment Amplification 67 Moment Distribution 70 Frame Analysis Software 70 Contents v Finite Element Analysis Plastic Method of Structural Analysis 71 Member Buckling Analysis 73 Frame Buckling Analysis 77 References

9 79 5 Design of TENSION MEMBERS 80 Introduction 80 Design of Tension Members to AS 4100 81 Worked Examples 82 Truss Member in Tension 82 Checking a Compound Tension Member with Staggered Holes 82 Checking a Threaded Rod with Turnbuckles 84 Designing a Single Angle Bracing 84 Designing a Steel Wire Rope Tie 85 References 85 6 DESIGNOF COMPRESSION MEMBERS 86 Introduction 86 Effective Lengths of Compression Members 91 Design of Compression Members to AS 4100 96 Worked Examples 98 Slender Bracing

10 98 Bracing Strut 99 Sizing an Intermediate Column in a Multi-Storey Building 99 Checking a Tee Section 101 Checking Two Angles Connected at Intervals 102 Checking Two Angles Connected Back to Back 103 Laced Compres