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为研究横系梁的设置方式对双薄壁高墩连续刚构桥地震响应的影响,基于OpenSEES建立了全桥三维非线性纤维模型,采用时程分析法,对比研究了4种横系梁工况。结果表明:横系梁对桥梁动力特性影响很大,有无横系梁的桥梁第一阶周期相差1倍以上;横系梁越强,墩身剪力的增幅越大,高墩纵向曲率和弯矩在横系梁附近的突变越显著;横系梁较强时,墩身纵向位移分布接近线性,最大位移在墩顶,增大了桥台支座的变形需求。从兼顾桥梁地震内力和变形两个方面而言,横系梁的设置均不宜过强。
In order to study the influence of horizontal beam on the seismic response of continuous rigid frame bridge with double thin-walled high piers, a three-dimensional nonlinear fiber model of full-bridge was established based on OpenSEES. Time-history analysis was used to compare four kinds of transverse beams condition. The results show that the transverse beam has a great influence on the dynamic characteristics of the bridge. The first-order periodicity of the bridge with or without transverse beam differs by more than one time. The stronger transverse beam, the greater the increase of pier shear force and the higher longitudinal curvature and moment The more obvious the sudden change near the transverse beam, the stronger the horizontal beam is. The longitudinal displacement distribution of the abutment is nearly linear and the maximum displacement is at the top of the pier, which increases the deformation requirements of the abutment. From the balance of both internal forces and deformation of the bridge, the cross beam should not be set too strong.