非规则桥面连续简支梁桥纵向地震响应分析

发布时间：2019-03-12 12:55

【摘要】：桥面连续简支梁桥由于具有良好的地形适应性、受力明确、施工方便、养护简单等优点,在我国山区高速公路中应用广泛。山区地形条件复杂,为了跨越高山峡谷,山区桥梁往往墩高较高且不同桥墩之间墩高相差较大,为典型的非规则桥梁,其地震响应十分复杂。本文在前人研究的基础上,针对非规则桥面连续简支梁桥的纵桥向地震响应进行研究,主要研究内容如下:(1)查阅文献资料,总结桥面连续简支梁桥地震反应的研究现状;根据我国简支梁桥的常见震害,总结应从震害中得到的启示,指出中小跨径梁式桥抗震概念设计的重要性及应遵循的具体原则。(2)总结目前常用的桥梁结构地震反应分析方法;建立考虑支座滑动效应、桥墩塑性、桥台约束作用及联与联间碰撞作用的精细化有限元模型;确定中美两国场地类型划分的对应关系并从PEER数据库选取合适的强震记录。(3)对桥面连续简支梁桥及普通简支梁桥进行动力特性分析;采用增量动力分析法,对不同地震动加速度峰值下桥面连续简支梁桥与普通简支梁桥的纵桥向地震反应进行对比分析,研究总结非规则桥面连续简支梁桥纵桥向地震反应的特点。(4)总结梁式桥纵向碰撞的危害及研究现状;研究地震动加速度峰值为0.4g时碰撞效应对原工程背景桥梁纵桥向地震反应的影响;在此基础上,通过简化模型,分别研究只考虑联间碰撞及同时考虑联间碰撞和主梁与桥台之间的碰撞时邻联刚度比(0.3~1.0)对桥梁纵桥向碰撞效应的影响。(5)总结梁式桥纵向限位措施的研究现状,分析桥面连续简支梁桥纵向限位的必要性;分别对拉索式连梁装置的刚度和液体黏滞阻尼器的速度指数α、阻尼系数C对其限位性能及桥梁整体抗震性能的影响进行参数分析。
[Abstract]:Continuous simple-supported bridge with bridge deck is widely used in mountainous expressway in China because of its advantages such as good terrain adaptability, clear stress, convenient construction, simple maintenance and so on. The terrain condition of mountain area is complex. In order to cross the mountain canyon, the pier height of mountain bridge is higher and the pier height difference between different piers is large. It is a typical irregular bridge, and its seismic response is very complex. On the basis of previous studies, this paper studies the longitudinal seismic response of continuous simply supported beam bridges with irregular decks. The main research contents are as follows: (1) referring to the literature and summarizing the present research situation of seismic response of continuous simply supported girder bridges on deck, the main research contents are as follows: (1) the seismic response of continuous simply supported girder bridges with irregular decks is studied. According to the common earthquake damage of simply supported girder bridge in our country, the enlightenment that should be gained from the earthquake disaster is summarized. This paper points out the importance of seismic conceptual design of small and medium span girder bridges and the specific principles to be followed. (2) summarize the commonly used seismic response analysis methods of bridge structures at present; A fine finite element model considering sliding effect of support, pier plasticity, abutment constraint and collision between abutment and abutment is established. The corresponding relationship of site classification between China and the United States is determined and appropriate strong earthquake records are selected from PEER database. (3) the dynamic characteristics of continuous simply supported bridge and ordinary simply supported beam bridge are analyzed. By means of incremental dynamic analysis method, the seismic response of bridge deck continuous simply supported girder bridge with ordinary simply supported beam bridge under different peak acceleration of ground motion is compared with that of ordinary simple supported beam bridge in the direction of longitudinal seismic response. The characteristics of longitudinal seismic response of continuous simply supported beam bridges with irregular deck are summarized. (4) the harm and research status of longitudinal collision of beam bridges are summarized. The impact of the impact effect on the longitudinal seismic response of the bridge in the original engineering background is studied when the acceleration peak of the ground motion is 0.4g. On this basis, by simplifying the model, The influence of the adjacent stiffness ratio (0.3? 1. 0) on the longitudinal impact effect of the bridge is studied when only the inter-connection collision is considered and the impact between the main beam and the abutment is considered at the same time. (5) the longitudinal limit effect of the beam-type bridge is summarized. The status of research on measures, The necessity of longitudinal limit of continuous simply supported girder bridge on deck is analyzed. The effects of stiffness, velocity index 伪 and damping coefficient C on the limit performance and the overall seismic performance of the bridge are analyzed respectively with respect to the stiffness of the cable connecting beam device and the velocity index 伪 and the damping coefficient C of the liquid viscous damper.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55

【参考文献】