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SHAKING TABLE TEST STUDY ON THE NEW ROCKING SELF-CENTERING BRIDGE PIERS
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摘要: 为探究摇摆自复位桥墩的地震响应规律和减隔震效果，提出两种分别增设高阻尼橡胶垫块与自复位弹簧的新型摇摆自复位桥墩模型，通过对相似比例为1：15的振动台试验桥墩模型，对比分析了两种摇摆自复位桥墩与传统铁路重力式桥墩的地震响应规律和减隔震效果。试验结果表明：在相同峰值的地震波作用下，与传统铁路重力式桥墩相比，两种新型摇摆自复位桥墩的墩顶加速度响应和墩底应力响应均显著减小，减小了地震作用对桥墩结构的破坏，新型摇摆自复位桥墩模型具有显著的减隔震效果；但与此同时，新型摇摆自复位桥墩的墩顶水平位移也会相应增加，位移大小与其提离约束部件的刚度大小密切相关；与增设自复位弹簧的摇摆自复位桥墩相比，增设高阻尼橡胶垫块的摇摆自复位桥墩，既能够通过摇摆提离反应和高阻尼垫块压缩耗能降低加速度和应力响应，又可有效控制墩顶水平的位移响应，是一种较为合理的摇摆自复位桥墩结构形式。Abstract: To explore the seismic response and effects of isolation of the rocking self-centering bridge piers, two kinds of bridge piers which are called the high damping rubber pads pier and the reset springs pier were proposed. The shaking table test models of bridge piers were made a 1∶15 similar proportion and the seismic response and effects of isolation of two kinds of bridge piers were analyzed in comparison with traditional railway gravity bridge piers. The test results showed that the maximum values of the acceleration on the top and the stress in the bottom of two kinds of new rocking self-centering bridge piers were remarkably decreased in comparison with traditional railway gravity bridge piers under different seismic intensities, and the damage to bridge piers caused by earthquake was reduced, thus, the new rocking self-centering bridge piers had evident effects of isolation. But at the same time, the horizontal displacement on the top of bridge piers would increase correspondingly and the value of displacement was closely related to the stiffness of the restraint parts. In comparison with the rocking self-centering pier with the self-centering springs, the rocking self-centering pier with high damping rubber pads not only could reduce the acceleration and stress response by lift reaction and energy dissipation, but also could control the values of horizontal displacement on the top of bridge piers. Therefore, it was a reasonable structure form of rocking self-centering bridge piers.
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