基于不同桥墩截面的高墩大跨连续刚构桥抗震性能研究及易损性分析

发布时间：2018-11-27 11:51

【摘要】：高墩大跨连续刚构桥作为交通运输网中重要的组成部分,其桥墩高度和跨度都已经超出了抗震设计规范的限值,而且目前进行抗震研究的高墩大跨连续刚构桥,其桥墩主要是钢筋混凝土薄壁空心墩,对桥墩采用钢管混凝土格构柱的桥梁的抗震研究还比较少,所以开展对这两种桥墩的高墩大跨连续刚构桥的抗震性能研究和易损性分析是必要的,通过分析计算,采用更有利于高墩大跨连续刚构桥的抗震性能的桥墩。本文以汾河特大桥为研究对象,首先运用OpenSees建立了10 m的主桥桥墩的矮墩模型,采用位移加载的方式研究了薄壁空心墩在纵桥向低周反复荷载作用下的抗震性能；根据截面的承载力相同,等效换算得出格构墩的桥墩截面,运用OpenSees建立了10 m的格构柱模型,在不同的轴压比和不同的缀条连结方式情况下,与钢筋混凝土薄壁空心墩做抗震性能的对比,选取抗震性能优于钢筋混凝土空心墩的格构墩,对钢筋混凝土薄壁空心墩进行替换。运用OpenSees建立汾河特大桥的有限元模型,采用动态时程分析方法,按规范要求对汾河特大桥的模型输入三条峰值加速度调幅为0.2 g的地震波纵桥向激励,得出桥梁的响应值最大的地震波为E1-Centro波；其次运用OpenSees建立主桥桥墩为格构柱的桥梁有限元模型,其材料和本构关系,选取E1-Centro波分别对主桥桥墩不同的两种连续刚构桥进行纵桥向和横桥向的地震激励,研究了两种桥梁的主桥桥墩的地震响应情况。运用增量动力分析(IDA)的研究方法,依据FEMA351,定义了桥墩截面的损伤状态,选取E1-Centro波对主桥桥墩不同的两种连续刚构桥,进了纵桥向的易损性分析,研究了两种桥梁在不断增强的地震激励作用下的抗震性能。
[Abstract]:As an important part of transportation network, the height and span of piers of long-span continuous rigid frame bridges with high piers have exceeded the limit of the seismic design code, and the long-span continuous rigid frame bridges with high piers and long spans have been studied at present. Its piers are mainly reinforced concrete thin-walled hollow piers. Therefore, it is necessary to study the seismic behavior and vulnerability of these two kinds of bridge piers with long span and long span continuous rigid frame bridge. Through the analysis and calculation, the pier is adopted which is more favorable to the seismic performance of the long span continuous rigid frame bridge with high pier and long span. In this paper, Fenhe Bridge is taken as the research object. Firstly, the short pier model of 10 m main bridge pier is established by using OpenSees, and the seismic behavior of thin-walled hollow pier under low cyclic loading of longitudinal bridge is studied by displacement loading method. According to the same bearing capacity of section and equivalent conversion, the section of bridge pier with special lattice pier is obtained by equivalent conversion. The model of lattice column with 10 m is established by using OpenSees. Under different axial compression ratio and different strands connection mode, Compared with reinforced concrete thin-walled hollow pier as seismic performance, the lattice pier whose seismic performance is better than reinforced concrete hollow pier is selected to replace the reinforced concrete thin-walled hollow pier. The finite element model of Fenhe super bridge is established by using OpenSees, and the dynamic time history analysis method is adopted. According to the specifications, three seismic wave longitudinal bridges with peak acceleration amplitude modulation of 0. 2 g are inputted into the model according to the specifications. It is concluded that the seismic wave with the largest response value of the bridge is E1-Centro wave. Secondly, the finite element model of the bridge with lattice column at the pier of the main bridge is established by using OpenSees. The material and constitutive relation of the finite element model of the bridge are established. Two kinds of continuous rigid frame bridges with different piers of the main bridge are subjected to the seismic excitation of longitudinal and transverse direction by E1-Centro wave, respectively. The seismic response of the piers of two main bridges is studied. Using the method of incremental dynamic analysis of (IDA), the damage state of pier section is defined according to FEMA351,. Two kinds of continuous rigid frame bridges with different piers of main bridge are selected by E1-Centro wave, and the vulnerability of longitudinal bridge is analyzed. The seismic behavior of two kinds of bridges under increasing earthquake excitation is studied.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.23

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