双薄壁高墩系梁设置方式对连续刚构桥地震响应的研究

发布时间：2018-05-07 14:33

本文选题：连续刚构桥 + 横系梁　；参考：《防灾减灾工程学报》2017年02期

【摘要】：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。
[Abstract]:In order to study the effect of the setting mode of transverse beam on the seismic response of continuous rigid frame bridge with double thin-walled and high piers, a three-dimensional nonlinear fiber model of the whole bridge was established based on OpenSEES, and four kinds of transverse beam working conditions were compared and studied by time history analysis. The results show that the transverse beam has a great influence on the dynamic characteristics of the bridge, and the first order period of the bridge with or without the transverse beam is more than 1 times, and the shear force of the pier is increased with the increasing of the transverse beam. The longitudinal curvature and bending moment of the high pier are more obvious in the vicinity of the transverse beam, the longitudinal displacement distribution of the pier is close to linear when the transverse beam is strong, and the maximum displacement is at the top of the pier, which increases the deformation demand of the abutment support. In terms of both seismic internal force and deformation of bridges, the setting of transverse beams should not be too strong.
【作者单位】：重庆交通大学土木工程学院;重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;
【基金】：交通运输部应用基础研究计划项目(2014319814210) 重庆市基础与前沿研究计划项目(cstc2015jcyjA30014) 国家自然科学基金项目(51408089) 山区桥梁与隧道工程国家重点实验室培育基地开放基金项目(CQSLBF-Y14-2)资助
【分类号】：U442.55;U448.23

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