地震作用下多跨钢筋混凝土简支梁桥的易损性分析

发布时间：2018-06-06 18:40

本文选题：地震 + 有限元模型　；参考：《东南大学》2015年硕士论文

【摘要】：近几十年来,我国地震频发,尤其是唐山大地震和汶川地震的发生给人民财产生命安全和基础设施造成了巨大的损失。随着人们安全防患意识的提高,桥梁等基础设施的抗震设防引起了越来越多的关注。桥梁结构作为交通运输系统中重要的环节,一旦桥梁结构发生破坏,可能造成整个交通运输系统的瘫痪,严重影响人们的正常生活和经济的运行以及抗震救灾工作的顺利展开。因此,对桥梁结构在地震作用下的破坏情况进行研究具有非常重要的意义。本文基于美国太平洋地震工程研究中心提出的“基于性能的地震工程”为框架,对地震作用下多跨钢筋混凝土简支梁桥的易损性进行了系统的研究,主要内容如下：1.对地震作用下多跨钢筋混凝土简支梁桥进行了需求分析。墩柱采用墩顶的最大位移延性比作为需求参数,地震动强度采用地面加速度(PGA)作为分析参数。根据桥梁结构的场地条件对应选取了10条地震波,并采用等步调幅法生成100条地震波的数据,采用SAP2000建立桥梁有限元模型,并对桥梁结构进行地震作用下的非线性动力时程分析,得到每一条地震波对应的墩顶最大位移。2.对地震作用下多跨钢筋混凝土简支梁桥进行了易损性分析。结合桥梁结构的倒塌破坏准则和结构的地震需求分析了桥梁结构的地震易损性,得到对应不同地震动强度下结构的破坏概率。3.对地震作用下多跨钢筋混凝土简支梁桥的易损性进行了参数分析。在其他条件不变的基础上,对桥梁结构的易损性进行参数分析,研究墩柱高度、桩土作用及桩基深度对结构易损性的影响。
[Abstract]:In recent decades, the frequent earthquakes in China, especially the Tangshan earthquake and Wenchuan earthquake, have caused great losses to people's property safety and infrastructure. With the improvement of people's awareness of safety and prevention, more and more attention has been paid to the seismic fortification of infrastructure such as bridges. Bridge structure as an important link in the transportation system, once the bridge structure is damaged, it may cause the paralysis of the whole transportation system, seriously affect the normal life and economic operation of people and the smooth development of earthquake relief work. Therefore, it is of great significance to study the damage of bridge structure under earthquake. Based on the "performance-based seismic engineering" proposed by the Pacific Seismic Engineering Research Center, this paper systematically studies the vulnerability of multi-span reinforced concrete simply supported beam bridges under earthquake action. The main contents are as follows: 1. The demand analysis of multi-span reinforced concrete simply supported beam bridge under earthquake action is carried out. The maximum displacement ductility ratio of the pier top is used as the requirement parameter and the ground acceleration PGA is used as the analysis parameter. According to the site conditions of the bridge structure, 10 seismic waves are selected, and 100 seismic waves are generated by the equal-step amplitude method. The bridge finite element model is established by SAP2000. The nonlinear dynamic time-history analysis of the bridge structure under seismic action is carried out, and the maximum displacement of the pier top corresponding to each seismic wave is obtained. The vulnerability analysis of multi-span reinforced concrete simply supported beam bridge under earthquake action is carried out. Based on the collapse criterion of bridge structure and the seismic demand of bridge structure, the seismic vulnerability of bridge structure is analyzed, and the failure probability of structure corresponding to different ground motion intensity is obtained. The vulnerability of multi-span reinforced concrete simply supported beam bridge under earthquake is analyzed. On the basis of other invariable conditions, the vulnerability of bridge structure is analyzed, and the influence of pier height, pile-soil action and pile foundation depth on the structural vulnerability is studied.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55

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