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《Structural Engineers》 2010-02
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Causation analysis and Enlightenment on Bridge Unseating in the Great WenChuan Earthquake

MENG Jie LIU Zhao(Department of Bridge-Tunnel and Underground Engineering,College of Civil Engineering,Southeast University,Nanjing 210096,China)  
In the Great WenChuan earthquake,many bridges were unseated due to ground shaking and permanent ground deformations resulting from the earthquake and other reasons.Based on field reconnaissance and considerations on structural characteristics of each bridge,the cause and process of the unseating phenomenon in MiaoZiPing and BaiHua Bridge were deduced.It was observed that the movement difference and collision between beam ends are the reason for the unseating of MiaoZiPing Bridge,while the unseating of the side span in BaiHua Bridge induces the whole structure to collapse.Moreover,the common characteristics for bridge unseating and the use of seismic restrainers were discussed.
【CateGory Index】: U442.55
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