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以某多孔连续梁桥为工程背景,提出了4种纵桥向抗震体系:常规抗震体系、增加固定墩抗震体系、液体粘滞阻尼器抗震体系和铅芯橡胶支座抗震体系。以常规抗震体系为参照,对比分析了固定墩个数、液体粘滞阻尼器和铅芯橡胶支座对结构抗震性能的影响。研究发现:增加固定墩个数,并不一定能减小桥梁结构的地震响应;液体粘滞阻尼器在不改变桥梁在正常使用状态下结构性能的前提下,可有效降低结构的地震响应,推荐为纵桥向抗震体系;铅芯橡胶支座使全桥刚度趋于均衡,可大幅降低桥梁结构的地震响应,在兼顾正常使用的前提下,推荐为纵桥向抗震体系。
Taking a multi-beam continuous girder bridge as engineering background, four kinds of longitudinal seismic systems are proposed: conventional anti-seismic system, anti-seismic system with fixed pier, anti-seismic system with liquid viscous damper and anti-seismic system with lead rubber bearing. Taking the conventional anti-seismic system as a reference, the influences of the number of fixed piers, liquid viscous dampers and lead rubber bearing on the seismic performance of the structure are analyzed. It is found that increasing the number of fixed piers does not necessarily reduce the seismic response of the bridge structure. Liquid viscous dampers can effectively reduce the seismic response of the structure without changing the structural performance of the bridge under normal conditions. Vertical seismic response to the system; lead rubber bearing stiffness of the bridge tends to be balanced, can greatly reduce the seismic response of the bridge structure, taking into account the normal use of the premise of the recommended longitudinal seismic system.