大跨度铁路连续梁拱组合桥梁地震响应特性

发布时间：2018-05-30 09:06

本文选题：梁拱组合桥 + 地震响应　；参考：《铁道科学与工程学报》2015年03期

【摘要】：为研究大跨度连续梁拱组合桥梁的地震响应规律,以兰渝线上某(82+172+82)m连续梁拱组合桥为例,建立考虑桩土共同作用的有限元分析模型。分别采用反应谱和时程分析法研究该桥的地震响应特点,探讨高阶振型、几何非线性、竖向地震作用及行波效应等因素对桥梁地震响应的影响。分析结果表明:该桥内力最大出现在拱脚处;截面内力主要由低阶振型(前30阶)控制,高阶振型的贡献较小;几何非线性对该大桥的地震响应影响较小,内力最大仅增加2.21%;竖向地震作用对截面轴力和面内弯矩起控制作用,其放大倍数最大可达2.88倍;行波效应对大跨度梁拱组合桥地震响应的影响不可忽视。
[Abstract]:In order to study the seismic response of long-span continuous beam-arch composite bridge, a finite element analysis model considering the interaction of pile and soil was established with a continuous beam and arch composite bridge of 82 172 82m on Lanyu line as an example. The response spectrum and time-history analysis were used to study the seismic response of the bridge, and the effects of high order mode, geometric nonlinearity, vertical earthquake action and traveling wave effect on the bridge seismic response were discussed. The results show that the maximum internal force of the bridge is at the arch, the internal force of the section is mainly controlled by the low-order mode (the first 30 orders), and the contribution of the high-order mode is relatively small, and the geometric nonlinearity has little effect on the seismic response of the bridge. The maximum internal force increases only 2.21; the vertical seismic action controls the cross-section axial force and in-plane bending moment, and the maximum magnification can reach 2.88 times; the effect of traveling wave effect on the seismic response of long-span beam-arch composite bridge can not be ignored.
【作者单位】：中南大学土木工程学院;
【基金】：国家自然科学基金资助项目(51378503) 高速铁路基础研究联合基金资助项目(U1334203) 中国博士后科学基金资助项目(2014M552158)
【分类号】：U442.55

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