Study on parameters of seismic isolated simple-supported beam bridges with HDR under pulse-type near-field earthquake

doi:10.16265/j.cnki.issn 1003-3033.2020.10.020

Abstract

Abstract: In order to study impacts of design parameters of simple-supported beam bridges on seismic response under pulse-type near-field earthquake motion, equivalent single-pier model of seismic isolated simple-supported beam bridges with HDR bearing were built by using SAP2000. Then, with typical near-field earthquake motions as inputs, change curves of seismic response of HDR beam bridges influenced by pier height and mass and equivalent isolated degree were obtained. The results show that the shorter the pier is, the larger equivalent period of beam bridges will increase. The higher it is, the greater peak displacement is. Meanwhile, seismic isolation effect of HDR is reduced when pier is more than 35 m high. Increase of pier mass has a adverse effect on it. Moreover, equivalent isolated degree of HDR has strong correlation with near-field seismic response of these beam bridges. When it is<2.0, seismic isolation effect will be bad but will improve along with increase of equivalent isolated degree when it is>3.0.

Key words: near-field earthquake motion, high damping rubber (HDR) bearing, seismic isolated simple-supported beam bridge, equivalent single-pier model, equivalent isolated degree

LI Yu, CHEN Ming, ZHAO Guohui. Study on parameters of seismic isolated simple-supported beam bridges with HDR under pulse-type near-field earthquake[J]. China Safety Science Journal, 2020, 30(10): 141-148.

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