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为了研究不同形式中央扣对大跨度自锚式悬索桥地震反应的影响,该文以某主跨406m的自锚式悬索桥为工程实例,利用Midas有限元分析软件建立其未设置中央扣、设置柔性中央扣、设置刚性中央扣的不同计算模型,使用多重Ritz向量法分别得出3种模型前180阶自振周期及振型,分析对比中央扣对3种模型动力特性的影响;并考虑纵横竖3个方向的共同地震力作用时,对3种模型分别进行弹性阶段的反应谱分析。研究表明:中央扣的设置提高了自锚式悬索桥整体刚度;该自锚式悬索桥的竖弯刚度、主塔横向侧弯刚度都明显增大;设置刚性中央扣比柔性中央扣更能提高结构的刚度。
In order to study the influence of different types of central buckle on the seismic response of long-span self-anchored suspension bridges, a self-anchored suspension bridge with a main span of 406m is taken as an example. Midas finite element analysis software is used to establish a central buckle with no central buckle and flexible center Buckle, set the rigid central buckle different calculation model, the use of multiple Ritz vector method were the first 180 models of the natural period and vibration mode, analysis and comparison of three central buckle on the dynamic characteristics of the three models; and consider vertical and horizontal vertical 3 In the direction of the common seismic force role, the three models were elastic phase response spectrum analysis. The results show that the setting of the center buckle increases the overall stiffness of the self-anchored suspension bridge. The vertical bending stiffness of the self-anchored suspension bridge and the lateral flexural rigidity of the tower increase obviously. Setting the rigid center buckle can improve the structure Stiffness.