匝道桥地震响应影响要素分析

发布时间：2018-01-14 04:26

本文关键词：匝道桥地震响应影响要素分析　出处：《桥梁建设》2015年04期 　论文类型：期刊论文

【摘要】：为探求匝道桥几何非规则性对结构地震响应的影响规律,基于嘉闵线匝道桥,采用SAP 2000软件建立结构有限元分析模型,分析不同跨径组合、纵坡、曲率半径和地震动输入方向下的匝道桥地震响应。结果表明:与简支梁桥相比,多跨连续梁桥顺桥向固定墩、横桥向矮墩和过渡墩的响应均变大;纵坡大小对桥梁纵向地震响应影响轻微,但在横桥向设置大纵坡可减小高墩区墩柱的地震响应;小曲率半径下采用切向或法向输入与地震动最不利输入方向存在角度偏差,会低估结构地震响应,大曲率半径下其地震响应与直线桥基本一致,可简化为直线桥进行分析。
[Abstract]:In order to find out the influence of geometrical irregularity of ramp bridge on structural seismic response, based on the ramp bridge of Jia-min line, the finite element analysis model of structure is established by using SAP 2000 software, and different span combinations and longitudinal slopes are analyzed. The seismic response of ramp bridge with curvature radius and ground motion input direction is obtained. The results show that compared with simply supported beam bridge, the response of multi-span continuous beam bridge in the direction of fixed pier, cross bridge pier and transition pier becomes larger. The longitudinal slope size has a slight effect on the longitudinal seismic response of the bridge, but setting a large longitudinal slope in the transverse direction of the bridge can reduce the seismic response of the pier column in the high pier area. The angle deviation between the tangential or normal input and the most unfavorable input direction of ground motion under the small radius of curvature will underestimate the seismic response of the structure, and the seismic response of the large curvature radius is basically the same as that of the linear bridge. It can be simplified as a straight line bridge for analysis.
【作者单位】：上海理工大学环境与建筑学院;同济大学土木工程防灾国家重点实验室;
【基金】：国家自然科学基金项目(51408359,51378384)~~
【分类号】：U448.17;U442.55
【正文快照】： 1引言匝道桥常具有小曲率半径、大纵坡、桩数布置较少等特点[1],这使得匝道桥在平面和立面布置上,都有很强的非规则性,导致其地震响应区别于常规桥梁,在地震中易遭到损坏。如美国SR14/I5立交枢纽在建成前后的2次大地震中均发生局部垮塌,切断下行线路交通;汶川地震中,百花大桥

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