Structural mechanicsPDF电子书下载

CHAPTER 1 Introduction 1

1.1　Structures and Their Classification 1

1.2　Cbjective and Learning Method of Structural Mechanics 3

1.3 Analytical Mbdels of Structures 5

1.4 Classification of Framed Structures 12

1.5 The Classification of Loads 15

Summary 16

Problems for Reflecting 17

CHAPTER 2　Geometric Construction Analysis of Structures 18

2.1 Purpose of Analyzing Geometric Construction of Structures,Stable and Unstable Structural Systems 18

2.2 The Concept of Degrees of Freedomand Restraints 19

2.3 Geometric Construction Rules of Planar Stable Framed Systems Wthout Redundant Restraints 24

2.4 Illustration of Geometric Construction Analysis 28

2.5 The Relationship between Static Determinacy and Geometric Construction of Structures 30

Summary 31

Problems for Reflecting 31

Problems for Solution 32

CHAPTER 3 Statically Determinate Beams 35

3.1 The Analysis of Single Span Beams 35

3.2 Construction of Bending Moment Diagram By Principle of Superposition for Straight Members 48

3.3 The Analysis of Simply Supported Inclined Beams 51

3.4 The Restraint Force Calculation and Geometric Construction of Statically Determinate Multispan Beams 55

3.5 The Construction of Internal Force Diagrams of Statically Determinate Multispan Beams 57

Summary 61

Problems for Reflecting 62

Problems for Solution 62

CHAPTER 4 Plane Statically Determinate Rigid Frames 67

4.1 Geometric Construction and Characteristics of Plane Statically Determinate Rigid Frames 68

4.2 The Analyzing of Reactions for Statically Determinate Rigid Frames 70

4.3 Determination of Internal Forces of Member Ends by Using the Method of Sections 73

4.4 The Construction of Internal Force Dlagrams of Statically Determinate Frames 76

4.5 Internal Force Diagrams of Statically Determinate Three-hinged Frames,Multispan and Multistory Frames 80

Summary 84

Problems for Reflecting 85

Problems for Solution 87

CHAPTER 5 Three Hinged Arches 91

5.1 The Constitution and Type of Three Hinged Arches 91

5.2 The Reactions of Three Hinged Arches Under the Action of Vertical Loads 92

5.3 The Formula for Calculating Internal Forces of Three Hinged Arches Under Action of Vertical Loads 94

5.4 Stressing Performance of Three Hinged Arches 99

5.5 Rational Axial Lines of Three Hinged Arches 100

Summary 104

Problems for Reflecting 105

Problems for Solution 106

CHAPTER 6 Plane Statically Determinate Trusses and Composite Structures 108

6.1 Characteristics and Classification of Trusses 108

6.2 The Method of Joints 114

6.3 The Method of Sections 119

6.4 The Combination of the Method of Joints and the Method of Sections 123

6.5 Formand Stressing Characteristics of Girder Trusses 125

6.6 Composite Structures 128

Summary 132

Problems for Reflecting 133

Problems for Solution 134

CHAPTER 7 General Remarks on Statically Determinate Structures 139

7.1 Analytical Methods for Statically Determinate Structures 139

7.2 General Property of Statically Determinate Structures 144

7.3 Stressing Characteristics of Various Types of Structures 148

Problems for Solution 151

CHAPTER 8 Influence Lines 153

8.1 Concept of influencelines 153

8.2 Influence Lines for Statically Determinate Single Span Beams by Static Method 156

8.3 Influence Lines for Girders with Floor Systems 163

8.4 Influence Lines for Trusses by Using Static Method 166

8.5 Virtual Displacement Method for Constructing Influence Lines for Statically Determinate Beams 170

8.6 Application of Influence Lines 179

Summary 192

Problems for Reflecting 193

Problems for Solution 194

CHAPTER 9 Principle of Virtual Work and Displacement of Structures 199

9.1 Introduction for Calculation of Structural Displacement 199

9.2 Virtual Work and Principle of Virtual Work 201

9.3 General Equation and Unit Load Method for Computing Displacements 212

9.4 Calculation of Displacements Caused by Loads 213

9.5 Graph-Multiplication Method 221

9.6 Calculation of Displacements Caused by Temperature Changes 233

9.7 Calculation of Displacements Caused by Support Movement 236

9.8 Reciprocal Laws for Linear Elastic System 238

Problems for Reflecting 243

Problems for Solution 246

CHAPTER 10 Force Method 251

10.1 Statically Indeterminate Structures and Degrees of Indeterminacy 251

10.2 Basic Concept of Force Method 254

10.3 Canonical Equations of Force Method 258

10.4 Statically Indeterminate Beams,Rigid Frames and Bent Frames 262

10.5 Statically Indeterminate Trusses and Composite Structures 272

10.6 Analysis of Symmetric Structures 277

10.7 Statically Indeterminate Arches 291

10.8 Internal Forces due to Support Settlements and Temperature Changes 303

10.9 Computation of Displacements of Statically Indeterminate Structures 309

10.10 Verification of Calculation of Statically Indeterminate Structures 313

Summary 317

Problems for Reflecting 320

Problems for Solution 323

CHAPTER 11 Displacement Method 329

11.1 Fundamental Concepts of Displacement Method 329

11.2 Member End Forces of Various Single-Span Indeterminate Prismatic Beams Due to Their End Displacements and External Loadings 332

11.3 Primary Unknowns and Primary Systems in Displacement Method 340

11.4 Displacement-Method Equations 345

11.5 Analysis of Statically Indeterminate Beams and Rigid Frames with No Sidesway 350

11.6 Analysis of Statically Indeterminate Rigid and Bent Frames with Sidesway 357

11.7 Analysis of Statically Indeterminate Symmetric Structures 365

11.8 Development of Displacement-Method Equations by Direct Stiffness Method 370

Summary 374

Problems for Reflecting 376

Problems for Solution 377

CHAPTER 12 Method of Successive Approximations and Influence Lines for Indeterminate Structures 383

12.1 General Remarks for Method of Successive Approximations 383

12.2 Concepts and Terminology in Moment Distribution Method 384

12.3 Moment Distribution at a Single Joint-Moment-Distribution Process 389

12.4 Moment Distribution at Multi-Joints-Successive Approximations 395

12.5 No-Shear Moment Distribution Method 408

12.6 Shear Distribution Method 414

12.7 Influence Lines for Forces of Statically Indeterminate Structures 420

12.8 Most Unfavorable Arrangement of Live Loads and Envelops for Internal Forces of Continuous Beams 426

Summary 430

Problems for Reflecting 431

Problems for Solution 432

CHAPTER 13 Matrix Displacement Method 436

13.1 Introduction 436

13.2 Member Stiffness Matrixin Local Coordinate System 441

13.3 Member Stiffness Matrixin Global Coordinate System 446

13.4 Global Stiffness Matrixes of Continuous Beams 451

13.5 Global Stiffness Matrixes of Rigid Frames 460

13.6 Equivalent Nbdal Loads 466

13.7 Procedure for Analysis and Examples 471

13.8 Global Analysis of Rigid Frames without Considering Axial Deformation 480

13.9 Block Diagramand Computer Programs for Plane Framed Structures 485

Summary 509

Problems for Reflecting 510

Problems for Solution 511

CHAPTER 14 General Remarks on Statically Indeterminate Structures 513

14.1 Classification and Comparison of Fundamental Methodused to Analyze Statically Indeterminate Structures 513

14.2 Combined Method-Simultaneously Applying Moment Distribution and Displacement Methods to Frames with Sidesway 513

14.3 Approximate Analysis of Statically Indeterminate Structures 515

14.4 Properties of Statically Indeterminate Structures 520

14.5 Complementary Discussion about Computing Models of Structures 527

Summary 533

Problems for Reflecting 539

Problems for Solution 540

Answers to selected problems 541

Bibliography 554