Study on Shaking Table Tests of Isolated Bridge Model with LRB

Abstract eng:
With the growth of the application of the seismic isolation technique to civil structures, a large variety of isolation systems has been developed during the past several decades. In order to investigate the vibration properties and isolated effect of continuous girder isolated bridges with lead rubber bearings (LRB) under multi-directional excitation, the simulated earthquake test of a seismically isolated bridge model consisting of two-span continuous deck is carried out on a shaking table. The acceleration response, displacement response in the deck, and restoring force relationship and vertical deformation of LRB are tested and analyzed in different earthquake intensity excitation. The isolated bridge stability will be secure and good isolation effect will be obtained under minor earthquake excitation if the design for LRB is reasonable. The response and relativity of various effect of seismically isolated bridge are tested and analyzed in multi-directional earthquake excitation. As a result, deck acceleration almost is equal on condition that unidirectional or bi-directional earthquake wave input, but deck acceleration is increase when input vertical earthquake wave. Comparison with unidirectional earthquake wave input, deck displacement is increase when bi-directional horizontal earthquake wave input, however, deck displacement is almost invariable when input vertical earthquake wave simultaneously. Horizontal force-deformation relationship in orthogonally horizontal direction and vertical force characteristic of LRB has been studied. Some reasonable and valuable conclusions are obtained to design of continuous girder isolated bridges.

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