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3-Dimensional finite element analysis of Xijian River Bridge on Guangzhou-Zhuhai intercity rapid rail transit

Li Jianhui1 Li Aiqun1 Luo Shidong2 Liu Zhengbiao2(1Key Laboratory for Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Nanjing 210096,China)(2The 4th Survey and Design Institute of China Railways,Wuhan 430063,China)  
In order to accurately simulate the static and dynamic characteristics of the single pylon continuous cable-stayed rigid-frame hybrid girder bridge, general finite element program is used to establish a precise three-dimensional space FE(finite element) modal.The strategy for space finite element model and corresponding development technology are firstly introduced.Based on it,computer program is compiled.The performance of static and dynamic characteristics and the role of the cable-stayed continuous rigid-frame structure in hybrid structure are analyzed in detail;a comparative analysis of the dynamic characteristics of the bridge is taken for the girders with or without consideration of prestressing.The calculation results show that the combination system bridge as a whole is characterized with the rigid frame loading characteristics type,the stay cable as reserve safety will play an important role for the "stiffness kept" of the structure,and prestressing effect of girder changes structural stiffness system,which has some influences on dynamic characteristics for hybrid structure.
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