Role of Ground Motion Characteristics on Inelastic Seismic Response of Irregular Structures

Abstract

AbstractThere is no general consensus among researchers for selecting appropriate set of ground motions for the evaluation of inelastic seismic response of plan-asymmetric structures. In this backdrop, the role of important ground motion characteristics on the demand of a plan-asymmetric system is studied by using a number of records with widely varying characteristics but adjusted (using wavelets) to a common spectral shape. An equivalent single-story rigid-diaphragm model with simple elastoplastic hysteresis behavior is employed. Efficient strength design, viz, center of strength–center of mass (CV-CM)–coinciding strategy, is adopted in recognition of the strength-dependent stiffness characteristics of the load-resisting elements. It has been shown that the torsion-induced response of such systems is statistically insensitive to important ground motion parameters such as duration, frequency content, the interrelationship between two horizontal components, and the energetic length scale. Conversely, this...