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Date of Publication:2022-10-09

Journal:大连理工大学学报

Issue:2

Page Number:248-254

ISSN No.:1000-8608

Abstract:More attention has been paid to inelastic design spectra with the development of performance/displacement based seismic design, because it can be used to estimate the maximum displacement demand of structures. The bi-directional inelastic response spectrum by considering the multi-component earthquake excitation and coupled characteristics of structural response is developed, which is defined as the ratio of the maximum displacement response in the same principal axes direction of a single-mass-system with two translational freedoms along its perpendicular principal axes when subjected to two- and one-dimensional ground motions respectively. Force-restoring characteristics of the two-degree-of-single-mass-system are determined by two-dimensional yield-surface plasticity theory. The inelastic spectra with constant strength reduction factors are given. The effects of periods, strength reduction factors and damping on spectra amplitude and bi-directional structural responses are discussed by statistic analysis of 10 recordings in two directions on hard-site. Bi-directional earthquake excitations will increase the maximum displacement response of structures in the direction with longer period mainly as compared with one-directional one. Increasing the design strength of structures in the direction with shorter period can reduce the negative effects of bi-directional ground motions on structural response. Damping has little influence on the inelastic spectra with constant strength reduction factors since it is defined by the ratio of the maximum displacement response.

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