Nonlinear Seismic Response of Isolated Bridges with LRB

Abstract eng:
In order to investigate the nonlinear seismic responses of isolated bridges with lead rubber bearings (LRB) under bi-directional horizontal earthquake excitation, bi-directional Bouc-Wen hysteretic model of LRB was adopted to describe the constitutive law of devices. Based on the bi-directional coupled Bouc-Wen model of LRB, an analytical model of nonlinear seismic responses of continuous multi-span isolated bridges with LRB and its solving method were carried out. Multi-degrees-of-freedom mathematical model of seismically isolated bridge is right and bi-directional coupled Bouc-Wen model of LRB is reasonable by shaking table tests of continuous girder isolated bridges model with LRB. Experiment results agreed expectably well with the results obtained from theoretically analytical results of displacement and acceleration of deck, vertical force of LRB, displacement and force-displacement of isolator roughly. It is verified that computation method of seismically isolated bridge given this paper is right and effective when analyzing nonlinear earthquake response of continuous girder isolated bridges with LRB. It should consider the bi-directional coupled interaction of the restoring forces of LRB, which has considerable effects on the seismic responses of the isolated bridge. Vertical tension of LRB should be considered if vertical earthquake amplitude is greater in isolator design.

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