连续刚构桥抗震性能分析研究

发布时间：2018-01-12 01:01

本文关键词：连续刚构桥抗震性能分析研究　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国交通事业的快速发展，越来越多的连续刚构桥被广泛的应用到实际工程之中，特别是在地形复杂的西南和西北地区，高墩大跨度的连续刚构桥在经济、适用、安全和美观四个方面都体现出巨大的优势。加上近些年来，世界范围内频繁发生的地震，把这一自然界最严重的灾害重新带进了人们的视线，同时由于西南和西北地区地震活动频繁，对连续刚构桥的地震反应分析显得更加重要。桥梁作为交通线路上的枢纽工程，在抗震要求上与其他建筑物有所不同。对桥梁抗震性能的要求，首先是要在地震灾后能保持交通线路的畅通，以方便灾后救援和重建工作的开展；其次由于桥梁造价高，维修困难且昂贵，尽量减小其在地震反应中受到的损伤，也是很必要的。本文首先介绍了曲线连续刚构桥及其结构特点，简要阐述了桥梁震害及高墩大跨曲线连续刚构桥的抗震研究现状；接着简单介绍了目前桥梁地震响应分析的基本理论，重点阐述了广泛应用的反应谱法和动力时程分析法；进而以某大桥为工程背景，建立了空间有限元力学模型，分析研究了高墩大跨曲线连续刚构桥的静动力特性，主要包括结构自振特性分析和结构在纵桥向、横桥向及竖桥向三个方向地震作用下的响应分析。建立了结构的多个变参数模型，分析了桩-土结构相互作用对高墩大跨曲线连续刚构桥地震响应内力和位移的不同影响，研究总结了桩-土结构相互作用对该桥抗震性能的影响规律，提出了一些设计建议。分析了研究对象在考虑行波效应时的地震响应特点，并与一致激励时的计算结果进行了对比分析，研究总结了行波效应对该桥抗震性能的影响规律，重点研究了不同边界条件、不同曲率半径以及不同地震激励方向对高墩大跨曲线连续刚构桥地震响应的影响，得出有益结论，地震作用下，连续刚构桥桥墩的墩顶和墩底是危险截面，跨中截面纵向位移较大，，高阶阵型在连续刚构桥抗震分析中起着控制作用等结论，为同类桥梁的抗震设计与研究提供相应参考。
[Abstract]:With the rapid development of transportation in China, more and more continuous rigid frame bridges have been widely used in practical projects, especially in the southwest and northwest areas with complex terrain, and the high-pier and large-span continuous rigid frame bridges are in the economy. In recent years, the frequent earthquakes around the world have brought back the most serious disaster in nature. At the same time, seismic response analysis of continuous rigid frame bridges is more important because of frequent seismic activities in southwest and northwest regions. As the hub of traffic lines, bridges are different from other buildings in seismic requirements. The first requirement for seismic performance of bridges is to maintain the smooth flow of traffic lines after earthquake disasters. To facilitate post-disaster relief and reconstruction efforts; Secondly, because of its high cost, difficult and expensive maintenance, it is necessary to minimize the damage caused by the bridge in earthquake response. This paper first introduces the curved continuous rigid frame bridge and its structural characteristics, and briefly describes the earthquake damage of the bridge and the seismic research status of the long span curved continuous rigid frame bridge with high piers. Secondly, the basic theory of bridge seismic response analysis is briefly introduced, and the widely used response spectrum method and dynamic time-history analysis method are emphasized. Then taking a certain bridge as the engineering background, the spatial finite element mechanical model is established, and the static and dynamic characteristics of the long-span curved continuous rigid frame bridge with high piers are analyzed and studied, including the analysis of the natural vibration characteristics of the structure and the analysis of the structure in the longitudinal direction of the bridge. The response analysis of transverse bridge and vertical bridge under seismic action is carried out. Several variable parameter models of the structure are established. The influence of pile-soil structure interaction on seismic response internal force and displacement of long-span continuous rigid frame bridge with high piers is analyzed, and the influence of pile-soil structure interaction on seismic performance of the bridge is summarized. Some design suggestions are put forward. The characteristics of seismic response of the research object considering traveling wave effect are analyzed and compared with the calculated results under consistent excitation. The influence of traveling wave effect on seismic performance of the bridge is summarized, and the effects of different boundary conditions, different curvature radius and different direction of earthquake excitation on the seismic response of long-span continuous rigid frame bridge with high piers are studied. The conclusion is that the pier top and bottom of the pier of continuous rigid frame bridge are dangerous section, the longitudinal displacement of the middle section of span is large, and the high order matrix plays a controlling role in seismic analysis of continuous rigid frame bridge. It provides a reference for the seismic design and research of similar bridges.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.23

【参考文献】