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The effects of antiseismic bolt on seismic estimation of heteromorphic bridge and its simulation

NIE Liying1,LI Jianzhong2,HU Shide2,FAN Lichu2(1.Department of Civil Engineering,Hohai University,Nanjing 210098,China;2.Department of Bridge Engineering,Tongji University,Shanghai 200092,China)  
In Xinzhuang interchange bridge engineering design,the mechanic characteristics of antiseismic bolts are difficult to symbolize by usual ways due to their special construction.In the light of seismic resistant design conception based on deformation and multi-failure criteria,by simulating the antiseismic bolt with two structural analysis models including ultimate boundary conditions and considering material and contact nonlinear properties according to practice in detail,pier yielding,bearing sliding and pounding between adjacent structures are simulated by elasto-plastic fiber beamcolumn element,sliding bearing element and contact element,respectively.The model is built up for three dimensional nonlinear time history analysis under the background of a heteromorphic bridge in Xinzhuang interchange engineering.The nonlinear time history analyses and estimations of seismic performance are carried out under design and severe level earthquake by using this model and a suggestion for strengthening stiffness of antiseismic bolts is made on the basis of comparing the analysis results.
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