大跨度拱桥的概率地震评价与减震控制-结构工程专业论文.docxVIP

Abstract As we all know, bridges are the very important structures in the highway system. However, owing to the therefore low design criteria and the neglect of bridge earthquake-resistance, in our country, the seismic capacity of many constructed bridges is not strong. So the study on the seismic capacity of bridge structure is very necessary. While scholars all over the world increasingly focused on performing a seismic risk analysis, they think that method is a very useful method to estimate the seismic capacity of bridge structure. To analyze the long span CFST arch bridge seismic vulnerability, this thesis according to the project of Natural Science Foundation of China has done some research as follows: According to the drawing of bridge construction, establish the finite element model of the bridge by use the finite element analysis software SAP2000. And we analyzed the structural dynamic characteristics of the bridge. Two kinds of effective isolation scheme is proposed on the basis of the original structure, Choose EI - Centro wave as the input of deterministic seismic, for dynamic elastic-plastic time history analysis of the original structure and isolation scheme. Seismic vulnerability analysis and seismic performance probability evaluation has been research by using the theory of based on the probability of bridge seismic evaluation and finite element model of the bridge and establish the vulnerability curves of the arch bridge. Seismic vulnerability analysis and seismic performance probability evaluation of two kinds of isolation scheme in the mentioned has been research and establish the vulnerability curves of the corresponding structure. Take isolation measures can improve the seismic performance under the great earthquake of the bridge after compared seismic performance of two kinds of isolation scheme with the original structure. Keywords: Long span CFST arch bridge; IDA curve; Vulnerability curves; Seismic vulnerability analysis 目录 摘要.............