大跨连续刚构桥抗震影响因素研究

发布时间：2019-01-18 13:40

【摘要】：众所周知，桥梁是公路交通网络的重要组成部分，是公路系统的咽喉和枢纽。桥梁无论跨度大小，只要在地震中发生严重的损毁，都有可能导致交通网络的瘫痪，从而严重影响灾后抗震救灾工作。连续刚构桥具有跨度大、受力合理、适应性强等优点，已经成为深沟险壑、地形复杂山区的首选桥型，作为生命线工程在抗震救灾中扮演着重要的角色。但是该类桥梁的跨度下，桥墩较高且差异较大，，其动力特性也较为复杂，地震响应与常见的中小跨径桥梁的地震响应有所不同。桩土效应、桥墩的截面形式和类型、减隔震支座的应用等都会对此类桥梁的抗震性能产生不同程度的影响。本文利用大型有限元软件Midas Cvil，主要研究了桩土效应、桥墩参数以及减隔震支座的应用对大跨度连续刚构桥抗震性能的影响。（1）简要的总结了目前桥梁工程界所采用的抗震分析理论和抗震设计的基本思想。（2）建立连续刚构桥的动力计算模型，进行连续刚构桥的地震响应特性分析。总结归纳了大跨度连续刚构桥的地震响应特点。（3）研究了桩土相互作用对大跨度连续刚构桥在地震作用下反应的影响，桥梁在进行抗震设计时要根据实际地质情况考虑桩土相互作用，桥梁选址尽量选择坚硬场地。（4）研究了连续刚构桥的主墩结构形式对桥梁抗震性能的影响，提出了一些大跨度连续刚构桥基于桥墩选型的概念设计原则。（5）分析了桥梁在使用了铅芯橡胶支座后的减隔震效果，为大跨连续刚构桥的减隔震设计提供参考借鉴。
[Abstract]:As we all know, bridge is an important part of highway traffic network and the throat and hub of highway system. No matter the span of the bridge, as long as serious damage occurs in the earthquake, it may lead to the paralysis of the traffic network, thus seriously affecting the disaster relief work. Continuous rigid frame bridge has the advantages of large span, reasonable force and strong adaptability. It has become the first choice of bridge type in deep gully and mountainous area, and plays an important role in earthquake disaster relief as a lifeline project. But under the span of this kind of bridge, the pier is relatively high and the difference is big, its dynamic characteristic is also more complex, the seismic response is different from the common medium and small span bridge seismic response. The pile-soil effect, the form and type of piers, and the application of isolation bearings have different effects on the seismic performance of this kind of bridges. In this paper, the effects of pile-soil effect, pier parameters and isolation bearing on the seismic behavior of long-span continuous rigid frame bridge are studied by using the finite element software Midas Cvil,. The main contents are as follows: (1) the theory of seismic analysis and the basic idea of seismic design are briefly summarized in the field of bridge engineering. (2) the dynamic calculation model of continuous rigid frame bridge is established, and the seismic response characteristic of continuous rigid frame bridge is analyzed. The seismic response characteristics of long span continuous rigid frame bridge are summarized. (3) the effect of pile-soil interaction on the seismic response of long-span continuous rigid frame bridge is studied. In seismic design, the pile-soil interaction should be considered according to the actual geological conditions, and the hard site should be chosen as far as possible. (4) the influence of the structure form of main pier of continuous rigid frame bridge on the seismic performance of the bridge is studied, and some conceptual design principles of long-span continuous rigid frame bridge based on pier selection are put forward. (5) the seismic isolation effect of the bridge with lead-rubber bearing is analyzed, which provides a reference for the design of the long-span continuous rigid frame bridge.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55;U448.23

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