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以虎门二桥坭洲水道桥为实际工程背景,研究了该桥的动力特性及地震反应的特点。为了有效控制地震作用下梁端过大的位移,在纵桥向塔梁连接处设置非线性黏滞阻尼器并研究其对坭洲水道桥抗震性能的影响。利用非线性动力时程分析方法,对非线性黏滞阻尼器的阻尼系数和阻尼指数进行了参数敏感性分析,其结果表明:在纵桥向塔梁连接处设置非线性黏滞阻尼器后,通过结构地震力及位移的综合比选确定黏滞阻尼器合适参数,可以有效降低梁端位移,同时可改善结构地震力。此外,还避免了价格昂贵的大型伸缩缝设置以及相邻构件可能发生的碰撞。
Based on the actual engineering background of Huizhou Second Bridge Shuizhou Island waterway bridge, the dynamic characteristics of the bridge and the characteristics of earthquake response are studied. In order to effectively control the excessive displacement of the beam end under earthquake, a nonlinear viscous damper is set up at the connection of the vertical beam to the tower girder and the influence on the seismic performance of Weizhou Chau Bridge is studied. The sensitivity analysis of the damping coefficient and the damping index of the nonlinear viscous damper is carried out by nonlinear dynamic time history method. The results show that after the nonlinear viscous damper is set on the connection of the vertical beam to the tower girder, Through the comprehensive comparison and selection of seismic force and displacement, the proper parameters of viscous damper can be determined, which can effectively reduce the displacement of beam end and improve the seismic force of structure. In addition, large, expensive expansion joints and collisions with adjacent components are avoided.