ASCE Standard ASCE/SEI 31 – 03 Seismic Evolution of Existing Buildings

CONTENTS

1.0 General Provisions 1-1

1.1 Scope 1-1

1.2 Basic Requirements 1-3

1.3 Definitions 1-8

1.4 Notation 1-12

1.5 References 1-16

2.0 Evaluation Requirements 2-1

2.1 General 2-1

2.2 Level of Investigation Required 2-1

2.3 Site Visit 2-2

2.4 Level of Performance 2-3

2.5 Level of Seismicity 2-4

2.6 Building Type 2-5

3.0 Screening Phase (Tier 1) 3-1

3.1 General 3-1

3.2 Benchmark Buildings 3-3

3.3 Selection and Use of Checklists 3-5

3.4 Further Evaluation Requirements 3-7

3.5 Tier 1 Analysis 3-9

3.6 Level of Low Seismicity Checklist 3-20

3.7 Structural Checklists 3-21

3.8 Geologic Site Hazards And Foundations Checklist 3-119

3.9 Nonstructural Checklists 3-121

4.0 Evaluation Phase (Tier 2) 4-1

4.1 General 4-1

4.2 Tier 2 Analysis 4-1

4.3 Procedures for Building Systems 4-33

4.4 Procedures for Lateral-Force-Resisting Systems 4-50

4.5 Procedures for Diaphragms 4-94

4.6 Procedures for Connections 4-106

4.7 Procedures for Geologic Site Hazards and Foundations 4-118

4.8 Procedures for Nonstructural Components 4-124

5.0 Detailed Evaluation Phase (Tier 3) 5-1

5.1 General 5-1

5.2 Available Procedures 5-1

5.3 Selection of Detailed Procedures 5-3

Appendix A – Examples A-1

A1.0 Example 1: Building Type W1: Wood Light Frame A-2

A2.0 Example 2: Building Type S1A: Steel Moment Frame with Flexible Diaphragms A-14

A3.0 Example 3: Building Type C3: Concrete Frame with Infill Masonry Shear Walls and Stiff Diaphragms A-34

A4.0 Example 4: Building Type RM2: Reinforced Masonry Bearing Wall Building with Stiff Diaphragms A-44

A5.0 Example 5: Building Type W2: Wood Frame, Commercial and Industrial A-59

A6.0 Example 6: Building Type S2: Steel Braced Frame with Stiff Diaphragms A-73

A7.0 Example 7: Building Type URM: Unreinforced Masonry Bearing Wall Building with Flexible Diaphragms A-88

Appendix B – Summary Data Sheet B-1

Index I-1