Structural Analysis

Structural Analysis
Fourth Edition

Aslam Kassimali
Southern Illinois University—Carbondale

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Structural Analysis, Fourth Edition Aslam Kassimali Director, Global Engineering Program: Chris Carson Senior Developmental Editor: Hilda GowansEditorial Assistant: Jennifer Dinsmore Marketing Specialist: Lauren Betsos Media Editor: Chris Valentine Content Project Manager: Diane Bowdler Production Service: RPK Editorial Services, Inc. Copyeditor: Harlan James Proofreader: Martha McMaster Indexer: Shelly Gerger-Knecthl Compositor: Integra Software Services (Pvt.) Ltd Senior Art Director: Michelle Kunkler Cover Designer: Andrew Adams CoverImage: common_republic/Shutterstock Photo Permissions Researcher: Kristiina Paul Permissions Account Manager - Images: John Hill Permissions Account Manager - Text: Mardell Glinski-Schultz Senior First Print Buyer: Doug Wilke

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Library of Congress Control Number: 2009920386 U.S. Student Edition: ISBN-13: 978-0-495-29565-5 ISBN-10: 0-495-29565-5

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IN MEMORY OF AMI

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Contents

Preface

xi

PART ONE INTRODUCTION TO STRUCTURAL ANALYSIS AND LOADS 1

1

Introduction to Structural Analysis

31.1 1.2 1.3 1.4 Historical Background 4 Role of Structural Analysis in Structural Engineering Projects 6 Classification of Structures 7 Analytical Models 12 Summary 16

2

Loads on Structures

17 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Dead Loads 18 Live Loads 21 Impact 24 Wind Loads 24 Snow Loads 32 Earthquake Loads 35 Hydrostatic and Soil Pressures 37 Thermal and Other E¤ects 37 LoadCombinations 37 Summary 38 Problems 39

v

vi

Contents

PART TWO

ANALYSIS OF STATICALLY DETERMINATE STRUCTURES 41

3

Equilibrium and Support Reactions

43 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Equilibrium of Structures 43 External and Internal Forces 46 Types of Supports for Plane Structures 47 Static Determinacy, Indeterminacy, and Instability 47 Computation of Reactions 60 Principle ofSuperposition 78 Reactions of Simply Supported Structures Using Proportions 79 Summary 80 Problems 82

4

Plane and Space Trusses

89 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 Assumptions for Analysis of Trusses 91 Arrangement of Members of Plane Trusses—Internal Stability 95 Equations of Condition for Plane Trusses 100 Static Determinacy, Indeterminacy, and Instability of Plane Trusses 100 Analysis of...