Advanced Seismic Assessment Guidelines

Abstract

iii ACKNOWLEDGMENTS iv CONTENTS v LIST OF FIGURES vii LIST OF TABLES xi 1 GUIDELINES AND PROCEDURE 1 1.1 Objective 1 1.2 PG&E Building Inventory 3 1.3 Procedure 4 1.4 Discussion of the Six Steps 7 1.4.1 Step 1: Nonlinear Static Procedure (NSP) Curve for Intact Building 7 1.4.2 Step 2: NSP Curves for Damaged Building 11 1.4.3 Step 3: Inferring Dynamic Response from Static Response 13 1.4.3.1 Intact Structure 15 1.4.3.2 Damaged Structure 16 1.4.4 Step 4: Occupancy Status for Damaged Building 24 1.4.5 Step 5: Ground Motion Level Associated with Structural Limit State 36 1.4.6 Step 6: Computation of Fragility Curves 45 2 APPLICATION OF THE GUIDELINES 51 2.1 Case Study No. 1: Three-Story Steel Moment-Resisting Frame (SMRF) Building...... 51 2.1.1 Structural Model 52 2.1.2 Connection Model 52 2.1.3 Application of the Guidelines 53 2.1.3.1 Step 1: NSP of Intact Structure and Identification of Damage States.... 53 2.1.3.2 Step 2: NSP Curves for Damaged Structure 54 2.1.3.3 Step 3: From SPO to IDA 56 2.1.3.4 Step 4: Occupancy Status for Damaged Building 64 2.1.3.5 Step 5: Ground Motion Level at Incipient Structural Limit State 65 2.1.3.6 Step 6: Computation of Fragility Curves 66 2.1.4 Validation 67 2.2 Case Study No. 2: Tilt-up Building 69 2.2.1 Structural Model 70