The Analysis of Irregular Shaped Structures: Wood Diaphragms and Shear Walls, Second Edition

by Terry R. Malone, Scott E. Breneman, Robert W. Rice

Overview

A complete guide to solving lateral load path problems—fully updated for current practices and regulations

This thoroughly revised guide explains how to calculate the lateral forces to be transferred across multiple diaphragm and shear wall discontinuities. You will get step-by-step examples that offer progressive coverage—from very basic to very advanced illustrations of load paths in complicated structures.

Written by a team of seasoned structural engineers and certified building official, The Analysis of Irregular Shaped Structures: Wood Diaphragms and Shear Walls, Second Edition contains comprehensive explanations of current topics, including cross laminated timber (CLT) which can be used in mass timber construction. You will get thorough coverage of up-to-date structural codes, requirements, and standards and includes newly developed structure types and new design solutions.

• Covers new topics of diaphragm solutions including CLT diaphragms and shear walls, a new method for calculating FTAO shear walls, and an expanded discussion on cantilever diaphragm design.
• Updated to reflect the most recent codes and standards, including, ASCE 7-16, 2021 IBC, and 2021 SDPWS with new CLT diaphragm and shear wall design requirements and guidelines.
• Written by a team of experienced structural engineers and certified building official.

Product Details

ISBN-13:	9781264278831
Publisher:	McGraw Hill LLC
Publication date:	08/12/2022
Sold by:	Barnes & Noble
Format:	eBook
Pages:	600
File size:	67 MB
Note:	This product may take a few minutes to download.

About the Author

R. Terry Malone, PE, SE, is a licensed structural engineer in Washington, Oregon, and Arizona. He is a senior technical director of the Project Resources and Solutions Division of Woodworks.

Scott E. Breneman, PhD, PE, SE, is a licensed structural engineer and a professional engineer in the state of California, and a PE in the state of Washington. He is experienced with structural design, seismic rehabilitation, and peer review of building projects of all shapes and materials. He is a senior technical director of the Project Resources and Solutions Division of Woodworks.

Robert Rice, CBO, is currently the Operations Manager/Chief Building Official for Northwest Code Professionals providing building official and building department services for jurisdictions throughout Oregon. He previously served as a Building Official for Josephine County and Oregon Assistant State Building Official.

Table of Contents

Preface xiii

Nomenclature xvii

1 Code Sections and Analysis 1

1.1 Introduction 1

1.2 IBC 2021 Code Sections Referencing Wind and Seismic 1

1.3 ASCE 7-16 Sections Referencing Seismic 2

1.4 Important AWC-SDPWS-2021 Sections 3

1.5 Sections Specifically Referencing Structural Irregularities 4

1.6 Complete Load Paths 5

1.7 Methods of Analysis 15

1.8 References Containing Analysis Methods for Complex Diaphragms and Shear Walls 16

1.9 References 19

2 Diaphragm Basics 21

2.1 Introduction 21

2.2 The Basic Lateral-Force-Resisting System 21

2.3 Load Distribution into a Diaphragm 27

2.4 Diaphragm Deflection 32

2.5 Diaphragm Boundary Elements 36

2.6 Drag Struts and Collectors 41

2.7 Chord and Strut Discontinuities 62

2.8 Sub-diaphragms 68

2.9 Introduction to Transfer Diaphragms 71

2.10 Introduction to Transfer Areas 81

2.11 Problem 82

2.12 References 83

3 Diaphragms with Horizontal End Offsets 85

3.1 Introduction 85

3.2 Method of Analysis 86

3.3 Development of Member Forces 96

3.4 Single Offset Diaphragms 97

3.5 Diaphragms Offset at Both Ends 127

3.6 Problems 136

3.7 References 143

4 Diaphragms with Intermediate Offsets 145

4.1 Introduction 145

4.2 Intermediate Offset, Transverse Loading 145

4.3 Optional Layouts 153

4.4 Diaphragm Deflections 155

4.5 Intermediate Offset, Longitudinal Loading 156

4.6 Diaphragms with Offset at the End Wall 164

4.7 Problems 171

4.8 References 173

5 Diaphragms with Openings 175

5.1 Introduction 175

5.2 Method of Analysis 178

5.3 Single Opening in Diaphragm 183

5.4 Diaphragm Deflection 191

5.5 Problem 191

5.6 References 192

6 Open-Front and Cantilever Diaphragms 193

6.1 Introduction 193

6.2 Code Requirements 194

6.3 Cantilever Diaphragm, Corridor-Only Shear Walls 195

6.4 Open-Front One Side 211

6.5 Irregular Shaped Cantilevers 216

6.6 Open-Front Both Sides-Boundary Member Forces 217

6.7 Cantilever Diaphragm with Back Span-Boundary Member Forces (Fig. 6.18) 223

6.8 Problems 228

6.9 References 230

7 Diaphragms with Vertical Offsets 231

7.1 Introduction 231

7.2 Method of Analysis 233

7.3 Single Vertical Offset in Diaphragm 239

7.4 Multiple Vertical Offsets in Diaphragm 246

7.5 Alternate Configurations 255

7.6 Problem 257

7.7 References 258

8 Complex Diaphragms with Combined Openings and Offsets 259

8.1 Introduction 259

8.2 Loads and Load Paths 259

8.3 Complex Diaphragms with Interior Shear Walls-Analysis in the Transverse Direction 265

8.4 Complex Diaphragms with Interior Shear Walls-Analysis in the Longitudinal Direction 287

8.5 Alternate layouts 303

8.6 Multi-Family Projects 303

9 Standard Shear Walls 307

9.1 Introduction 307

9.2 Shear Wall Basics-Standard Walls 308

9.3 Hold-Down Anchors and Boundary Members 315

9.4 Shear Wall Sheathing Combinations 321

9.5 Shear Wall Aspect Ratios and Reduction Factors 323

9.6 Shear Wall Rigidity and Nominal Shear Wall Stiffness 324

9.7 Sloped Shear Walls 329

9.8 Multistory Shear Wall Analysis 332

9.9 Multistory Shear Wall Effects 338

9.10 Interior Shear Walls 339

9.11 Shear Wall Foundation Issues 350

9.12 References 357

10 Shear Walls with Openings 359

10.1 Introduction 359

10.2 Perforated Shear Walls 360

10.3 Shear Walls with Force Transfer Around an Opening 365

10.4 Shear Walls with Openings-The Cantilever Method 396

10.5 Shear Walls with Small Openings 402

10.6 Problems 404

10.7 References 406

11 Discontinuous Shear Walls 407

11.1 Introduction 407

11.2 In-Plane Offset Shear Walls 407

11.3 Vertically Discontinuous Shear Walls 430

11.4 Two-Stage Podium Structures 441

11.5 Problem 442

11.6 References 444

12 Offset Shear Walls 445

12.1 Introduction 445

12.2 Out-of-Plane Offset Shear Wall Layouts 445

12.3 Offset Walls in the Same Line of Lateral Force Resistance 445

12.4 Interior Offset Shear Walls 465

12.5 Problem 470

13 The Portal Frame 471

13.1 Introduction 471

13.2 Testing and Research 472

13.3 Foundation Issues 476

13.4 Alternate Frame Systems 480

13.5 Problem 482

13.6 References 483

14 CLT Diaphragms 485

14.1 Introduction 485

14.2 SDPWS 2021 Requirements 488

14.3 Connection Detailing 493

14.4 Boundary Element Detailing 497

14.5 Addressing Irregularities in CLT Diaphragms 498

14.6 Diaphragm Stiffness and Deflections 509

14.7 References 512

15 CLT Shear Walls 513

15.1 Introduction 513

15.2 Range of Possible CLT Shear Wall Systems 514

15.3 SDPWS Seismically Detailed Platform-Framed CLT Shear Walls 524

15.4 References 531

Index 533