深水区高墩大跨预应力混凝土连续刚构桥弹性地震响应研究

摘要

针对深水库区高墩大跨径预应力混凝土刚构桥的结构特点,考虑桩-土相互和动水之间的耦合作用,采用等代刚度法和大型通用有限元程序ANSYS,对某预应力混凝土刚构进行了线弹性地震响应分析,分别研究了横梁设置位置对下部结构和上部结构顺桥向和横桥向的地震响应特点.研究结果表明:随水深与墩高比h/H的加大,顺桥向地震波作用下,主梁根部及各跨跨中竖向弯矩增幅较大,其余变化较小；横桥向地震波作用下,边墩墩顶以及中墩墩顶和墩底横向弯矩增幅较大,其余变化较小.%According to the feature of prestressing concrete rigid frame bridge with long span and high piers located in deep water, the coupled action for pile and soil and dynamic water was considered, on the basis of the equivalent rigidity method and the FEM propram, the seismic response of prestressing concrete rigid frame bridge with long span and high piers the bridge model was analyzed, the seismic response feature on setting location of beam for lower and topper structure along and cross bridge was studied. The studied results indicate: with increment of depth of water and height of pier, the vertical moment for the root and mid span of main beam has a large amplify under action of seismic response along bridge, and the moment in the other part become little obvious, with increment of depth of water and height of pier, the cross moment for the pier top and per bottom of main beam has a large amplify under action of seismic response along bridge, and the moment in the other part become little obvious.