高墩大跨曲线连续刚构桥地震响应分析

发布时间：2019-04-18 06:24

【摘要】： 近年来,全球地震频繁发生,桥梁作为生命线工程,一旦在地震中发生破坏,将会给人们的生命和财产安全造成巨大的损失;随着公路事业的发展,预应力混凝土连续刚构桥的跨径不断增大,而由于路线线形要求和受地形条件限制,越来越多地需要修建大跨曲线连续刚构桥。对于大跨曲线连续刚构桥的动力特性,特别是其地震反应特性,目前研究比较少。本文首先简要对比分析了直线和曲线连续刚构桥的特点,综述了桥梁震害及高墩大跨直线和曲线连续刚构桥的地震响应分析研究的现状;进而阐述了桥梁地震响应分析的基本理论,详细介绍了地震反应分析的反应谱法和动力时程法;然后,以白水冲大桥左幅主桥为工程实例,进行了连续刚构桥动力分析研究,包括结构自振特性分析,桥跨结构在地震作用下的响应分析,并讨论了行波效应对结构响应分析结果的影响。在此基础上,重点研究了曲线连续刚构桥曲率半径、地震激励方向、桥墩墩高等结构参数对曲线连续刚构桥地震响应的影响。计算和分析研究表明:行波的输入方向对桥墩地震响应有较大影响,考虑行波效应时结构内力响应更大;随着平曲线曲率半径的减小,曲线连续刚构桥各主要控制内力响应值总体趋势均有所减小;随着墩高的增加,结构各主要控制内力响应值有所减小。期望以上结论能对同类桥梁的抗震设计提供参考。
[Abstract]:In recent years, global earthquakes occur frequently. Bridge, as a lifeline project, once destroyed in the earthquake, will cause huge losses to people's lives and property security. With the development of highway, the span of prestressed concrete continuous rigid frame bridge is increasing. However, it is more and more necessary to build long span curved continuous rigid frame bridge due to the requirement of line alignment and the limitation of terrain. There is little research on the dynamic characteristics of long-span curved continuous rigid frame bridges, especially the seismic response characteristics of long-span continuous rigid frame bridges. In this paper, the characteristics of straight-line and curved continuous rigid-frame bridges are compared and analyzed briefly, and the present situation of earthquake damage and seismic response analysis of long-span straight-line and curve-continuous rigid-frame bridges with high piers is summarized. Furthermore, the basic theory of bridge seismic response analysis is expounded, and the response spectrum method and dynamic time-range method of seismic response analysis are introduced in detail. Then, taking the left main bridge of Baishuiong Bridge as an engineering example, the dynamic analysis of the continuous rigid frame bridge is carried out, including the analysis of the natural vibration characteristics of the structure and the response analysis of the bridge span structure under the action of earthquake. The effect of traveling wave effect on the results of structural response analysis is also discussed. On this basis, the influence of curvature radius, seismic excitation direction and pier higher structural parameters on the seismic response of curved continuous rigid frame bridge is studied. The results of calculation and analysis show that the input direction of traveling wave has a great influence on the seismic response of pier, and the internal force response of the structure is larger when the traveling wave effect is considered. With the decrease of curvature radius of flat curve, the general trend of response value of main control internal force of curved continuous rigid frame bridge decreases, and with the increase of pier height, the response value of main control internal force of structure decreases. It is expected that the above conclusions can provide reference for aseismic design of similar bridges.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2009
【分类号】：U442.55

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