Hysteretic energy demand for self-centering SDOF systems

摘要

The objective of this study is to introduce a procedure for determining the hysteretic energy demand for self-centering single-degree-of-freedom (SDOF) systems with typical flag-shaped hysteretic models considering the influences of the structural characteristics. Based on nonlinear dynamic time history analyses using a series of representative earthquake records that have been carefully selected, the relationship between the hysteretic energy demand and structural parameters is investigated. Subsequently, the spectra of the ratio of the hysteretic energy E-H to the input energy E-I, denoted as the E-H/E-I spectra, are proposed. The results indicate that ground motion types have little influence on the E-H/E-I spectra. However, both structural features, including energy ratio, damping ratio, and ductility factor, and the initial period of systems, play a significant role in the determination of the E-H/E-I spectra. The proposed approach can be used to predict the hysteretic energy demand for self-centering SDOF systems.