抗震销的模拟及其对异型板桥抗震性能影响分析
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摘要
抗震销在上海莘庄立交工程的设计中,由于构造的特殊性,其力学特性难以用常规方法表达。基于位移和多级设防的抗震思想,以莘庄立交工程中的一异型板桥为例,首次以两个包含极端边界条件的结构分析模型考虑抗震销这一特殊构造措施对结构的影响,并按照实际结构构造充分考虑材料非线性及连接构件的非线性等因素,分别以弹塑性纤维梁柱单元、空间滑动支座单元和接触单元模拟桥墩屈服、支座滑动、相邻结构之间碰撞,建立了空间非线性时程反应分析模型,并进行了设计和罕遇地震水平两个概率水准下的地震反应分析和抗震性能评估,并根据分析结果的对比,提出强化抗震销刚度的建议。
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.
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.
引文
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[2]Caltrans.Seismic design criteria,version 1.2[S].Sacramento,California:California Department of Transportation(CALTRANS),2001.
[3]卓卫东,范立础.结构抗震设计中的强度折减系数研究[J].地震工程与工程振动,2001,21(1):84-88.
[4]叶爱君,范立础.大型桥梁工程的抗震设防标准探讨[J].地震工程与工程振动,2006,12(2):8-12.
[5]Priestlay MJ N,Seible F,Calvi G M,Seismic design and retrofit of bridges[M].New York:John Wiley&Sons,1996.
[6]范立础,聂利英,李建中.地震作用下板式橡胶支座滑动的动力性能分析[J].中国公路学报,2003,16(4):30-35.
[7]聂利英,李建中,范立础.滑动支座中竖向动反力对桥梁结构动力性能的影响[J].同济大学学报,2002,30(11):1290-1294.
[8]Enrico S,Filip C.Filippou,et al.Taucer,Fibre beam-column model for nonlinear analysis of R/C Frames:Part I.Formulation[J].Earth-quake Engineering and Structural Dynamics,1996,25:711-725.
[9]Enrico S,Filip C.Filippou,et al.Taucer,Fibre beam-column model for nonlinear Analysis of R/C Frames:Part II.Application[J].Earth-quake Engineering and Structural Dynamics,1996,25:727-742.
[10]Satish N,Andrel MR.Nonlinear dynamic analysis of3-d-base-isolated structure[J].Journal of Structural Engineering,1991,117:2035-2054.
[11]Parveen K M,Moh J H,Anthony F S.Seismic interaction at separation joints of an instrumented concrete bridge[J].Earthquake Engineering&Structural Dynamics,1995(24):1055-1067.
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