考虑行波效应的线—桥结构地震响应研究

发布时间：2018-04-21 09:57

本文选题：地震 + 高速铁路　；参考：《中国铁道科学研究院》2014年硕士论文

【摘要】：高速铁路对社会经济的发展起着非常重要的作用。为了满足高速铁路对线路的要求，桥梁结构在高速铁路中的比重不断增加。中国是一个地震灾害严重的国家，多条高速铁路穿越地震带。因此，线—桥结构的抗震性能日益受到关注。本文在借鉴国内外现有研究成果的基础上，针对高速铁路典型的无砟轨道桥梁，考虑行波效应的作用，建立了绝对坐标系下线—桥地震响应动力平衡方程，编制了相应的分析程序TBDAUE。并以常用的多跨简支梁桥为研究对象，系统分析了一致地震动和非一致振动地震动作用下线—桥结构动力性能。本文的主要研究成果如下： 1.三向一致振动地震波作用下，由于纵向地震波的作用使得墩顶发生转角位移，从而使得简支梁梁缝邻近区域的钢轨在垂向发生错位。而钢轨的横向位移则以平移为主，其横向变形较小。因此在进行线—桥结构的地震响应研究时，纵向地震波的影响很大。 2.在不同剪切波速的地震波作用下，各跨的梁及上部的轨道结构的地震响应除了相位差之外没有显著差异。 3.在由于行波效应引起的非一致地震波作用下，桥梁结构和轨道结构的横向变形主要由地面位移时程的相位差所引起，，垂向变形则主要由地面位移时程的相位差和墩顶转角位移共同引起。 4.考虑行波效应后，地震作用下不同墩高对桥梁结构和轨道结构的横向变形的影响很小，但对垂向变形的影响较大。
[Abstract]:High-speed railway plays a very important role in the development of social economy. In order to meet the requirements of high-speed railway, the proportion of bridge structure in high-speed railway is increasing. China is a country with severe earthquake disasters. Many high-speed railways cross the seismic belt. Therefore, the seismic performance of line-bridge structures has been paid more and more attention. Based on the existing research results at home and abroad and considering the effect of traveling wave on the typical ballastless track bridge of high-speed railway, the dynamic equilibrium equation of seismic response of line-bridge in absolute coordinate system is established in this paper. The corresponding analysis program TBDAUE. Taking the commonly used multi-span simply supported beam bridge as the research object, the dynamic performance of the line-bridge structure under the action of uniform and non-uniform vibration ground motion is systematically analyzed. The main research results of this paper are as follows: 1. Under the action of the seismic wave of three direction consistent vibration, because of the action of longitudinal seismic wave, the corner displacement of the pier top occurs, which makes the rail in the adjacent area of the joint of the simply supported beam dislocate in the vertical direction. On the other hand, the lateral displacement of rail is mainly translation, and its transverse deformation is small. Therefore, longitudinal seismic waves have a great influence on the seismic response of linear bridge structures. 2. Under the action of seismic wave with different shear wave velocities, there is no significant difference in seismic response of beam and upper track structure except phase difference. 3. Under the action of non-uniform seismic wave caused by traveling wave effect, the transverse deformation of bridge structure and track structure is mainly caused by the phase difference of ground displacement time history. The vertical deformation is mainly caused by the phase difference of the time history of the ground displacement and the angular displacement of the top of the pier. 4. After considering the traveling wave effect, different pier heights have little effect on the transverse deformation of bridge structure and track structure, but have great influence on vertical deformation.
【学位授予单位】：中国铁道科学研究院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U211.3

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