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以一座大跨度斜拉桥为研究对象,用Midas Civil软件建立其全桥三维有限元模型。针对其在E2地震作用下位移超过限值问题,提出在桥墩与上部结构间布置盆式支座+黏滞阻尼器的减震方案,对黏滞阻尼器阻尼指数进行优化分析,得到最优阻尼指数,进一步对其位移及内力进行了减震效果分析。分析结果表明,主墩支座位移从596mm降至216mm,最大减震效果达63.8%,满足规范要求;在主跨部分布置盆式支座和黏滞阻尼器对其他跨桥墩墩底弯矩也有一定降低效果,两者耗能特性得到充分发挥,能够有效降低结构的地震响应,证明了盆式支座+黏滞阻尼器减震方案的合理性和可行性。
Taking a long-span cable-stayed bridge as the research object, the full-bridge three-dimensional finite element model of the bridge was established by using Midas Civil software. In order to solve the problem that the displacements exceed the limit value under the action of E2 earthquakes, a cushioning scheme of basin bearing + viscous damper between bridge pier and superstructure is proposed. The damping index of viscous dampers is optimized and the optimal damping Index, to further its displacement and internal forces were shock absorption effect analysis. The analysis results show that the displacements of the abutment of main pier are reduced from 596mm to 216mm, the maximum damping effect is up to 63.8%, which meets the requirements of the code. In the main span, the basin abutment and viscous damper are also applied to the bending moment of other pier piers The effect of energy dissipation will be fully exerted, which can effectively reduce the seismic response of the structure, and prove the rationality and feasibility of the shock absorber scheme of the basin bearing + viscous damper.