Capacity-Demand-Diagram Methods for Estimating Seismic Deformation of Inelastic Structures: SDF Systems

ii ACKNOWLEDGMENTS iii CONTENTS iv INTRODUCTION 1 EQUIVALENT LINEAR SYSTEMS 3 ATC-40 ANALYSIS PROCEDURES 7 PROCEDURE A 8 Examples: Specified Ground Motion 8 Examples: Design Spectrum 15 PROCEDURE B 21 Examples: Specified Ground Motion 21 Examples: Design Spectrum 26 EVALUATION OF ATC-40 PROCEDURES 29 SPECIFIED GROUND MOTION 29 DESIGN SPECTRUM 33 IMPROVED PROCEDURES 38 INELASTIC DESIGN SPECTRUM 38 INELASTIC DEMAND DIAGRAM 38 PROCEDURE A 40 Examples 40 Comparison with ATC-40 Procedure A 46 PROCEDURE B 46 Examples 47 Comparison with ATC-40 Procedure B 47 ALTERNATIVE DEFINITION OF EQUIVALENT DAMPING 47 IMPROVED PROCEDURE: NUMERICAL VERSION 51 BASIC CONCEPT 51 RY – μ −TN EQUATIONS 51 CONSISTENT TERMINOLOGY 55 CONCLUSIONS 55 NOTATION 58 REFERENCES 60