铅销橡胶支座应用与桥梁减震的优化配置研究

The Study of Seismic Reduction of the Bridge Equipped with Optimal LRB

探讨了铅销橡胶支座 ( LRB)用于桥梁减震的有效性及其铅销的优化配置 ,利用非线性时程分析法研究了典型“U”型和“V”型河谷上的梁式简支桥在不同地震波激励下的地震作用 ,结果表明采用合理配置的 LRB较普通的橡胶支座 ( RB)具有同时减小支座的最大变位和降低桥墩的地震响应等优点 ,并指出桥梁采用 LRB减震主要是靠墩与梁的动力相互作用来实现。

The effectiveness of seismic reduction of the bridge equipped with lead rubber bearing(LRB) and the optimal configuration of LRB are studied.The responses of simply supported beam bridge sited in the U shaped and V shaped valleys excited by different ground motions are analyzed with non linear time history response analysis procedure.The result shows that the bridge equipped with the optimal LRB can resist the earthquake loads better than which equipped with the normal RB,the deformations of the bearings and the earthquake responses at the top of the piers will be reduced.The mechanism of the seismic reduction of the bridge equipped with LRB,the interaction between the piers and the beams,is pointed.