高墩多跨曲线连续刚构桥地震时程响应分析

发布时间：2018-05-31 19:31

本文选题：高墩多跨 + 曲线连续刚构　；参考：《郑州大学》2014年硕士论文

【摘要】：我国西部大部分地区属山岭重丘区，地形复杂，山高谷深。高墩多跨曲线连续刚构桥由于其能够很好地克服地形、地貌的影响，逐渐成为了跨越山区大河及深谷的主要桥型。本文以三淅高速卢灵段的白水峪大桥为依托，对高墩多跨曲线连续刚构桥的地震时程响应最不利激励方向进行了分析，主要研究内容及结论如下：（1）综述国内外研究现状，，总结高墩多跨曲线连续刚构桥动力分析的理论及方法。（2）分别建立梁单元和实体单元模型，研究不同的曲率半径以及墩高对结构自振特性的影响，高墩曲线多跨连续刚构桥的基频所对应的模态为主梁和墩的纵飘，且一阶纵飘的自振频率随着曲率半径增大而增大；对于一阶横弯与前四阶竖弯来说，自振频率随着曲率半径增大而减小，随着墩高增大而减小。（3）运用动态时程分析法施加不同角度的地震时程波研究最不利激励方向，在顺桥向和横桥向的多维激励下，最靠近跨中的桥墩墩顶与主梁边界支承处的割线及垂直于此割线方向的激励方向为最不利激励方向。（4）在最不利激励方向下，研究了曲率半径与墩高对结构地震响应的敏感性，在横向激励下，跨中横向位移与边墩的内力随着曲率半径增大而增大，随着墩高的增加而增大，3#墩的内力随着曲率半径的增大变化并不明显；在纵向激励下，跨中纵向位移较小，桥墩的内力随着曲率半径的增大而减小，随着墩高的增大而增大。
[Abstract]:The western part of our country belongs to the mountain heavy hill area, the terrain is complex, the mountain is high and the valley is deep. Because of its ability to overcome the influence of topography and geomorphology, the multi-span continuous rigid frame bridge with high piers has gradually become the main bridge type crossing the mountain rivers and deep valleys. Based on the Baishuiyu Bridge in the Luling section of Sanzheng Expressway, this paper analyzes the most unfavorable excitation direction of the seismic time history response of the multi-span continuous rigid frame bridge with high piers. The main research contents and conclusions are as follows: 1) summarize the research status at home and abroad, summarize the theory and method of dynamic analysis of multi-span curved continuous rigid frame bridge with high piers. (2) the beam element model and the solid element model are established, and the influence of different curvature radius and pier height on the natural vibration characteristics of the structure is studied. The fundamental frequency corresponding to the fundamental frequency of the curved multi-span continuous rigid frame bridge with high pier is mainly the longitudinal floating of beam and pier. For the first order transverse bending and the first four vertical bending, the natural frequency decreases with the increase of curvature radius and decreases with the increase of pier height. 3) using dynamic time-history analysis method to study the most unfavorable direction of excitation by applying seismic time-history waves at different angles, under the multi-dimensional excitation in the direction of forward bridge and transverse direction. The most unfavorable excitation direction is the cutting line at the top of pier and the boundary support of the main beam and the direction perpendicular to the direction of the bridge pier in the middle of span. The sensitivity of curvature radius and pier height to the seismic response of the structure is studied under the most unfavorable excitation direction. Under transverse excitation, the transverse displacement of span and the internal force of side pier increase with the increase of curvature radius. With the increase of pier height, the internal force of pier increases with the increase of radius of curvature, and under longitudinal excitation, the longitudinal displacement of span is smaller, the internal force of pier decreases with the increase of radius of curvature, and increases with the increase of height of pier.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23;U442.55

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