曲线箱梁桥的地震反应分析
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摘要
结合某城市一立交工程匝道高架曲线箱梁桥的工程实例,采用大型有限元分析程序ANSYS,选取空间梁单元建立动力计算模型,研究了曲线箱梁桥的动力特性;并选取三条地震波在桥的纵、横向同时进行桥梁地震作用下的时程分析,给出了曲线箱梁和桥墩的内力、位移时程反应,并与反应谱法的计算结果进行了比较。结果表明:低阶振型对桥墩的弯扭变形影响较大,反应谱法的计算结果偏小。
Taking an engineering design case about a curved box-girders bridge,the dynamic calculating model of the curved box-girders bridge is created by the finite element analysis program ANSYS.The dynamic characteristic of the curved box-girders bridge is discussed,a time history analysis is conducted for the curved box-girders bridge subjected to three earthquake waves in the longitudinal and the lateral direction,and the internal force,displacement and the time history response of the curved box-girders and bridge pier are obtained,and are compared with the results of response spectrum method.The results indicate that lower frequency models of vibration have significant influence on bending and torsion deformation of bridge pier,the results of response spectrum method are smaller.
Taking an engineering design case about a curved box-girders bridge,the dynamic calculating model of the curved box-girders bridge is created by the finite element analysis program ANSYS.The dynamic characteristic of the curved box-girders bridge is discussed,a time history analysis is conducted for the curved box-girders bridge subjected to three earthquake waves in the longitudinal and the lateral direction,and the internal force,displacement and the time history response of the curved box-girders and bridge pier are obtained,and are compared with the results of response spectrum method.The results indicate that lower frequency models of vibration have significant influence on bending and torsion deformation of bridge pier,the results of response spectrum method are smaller.
引文
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[8]Chang P C,Heins C P,Li G H,et a1.Seismic study ofcurved bridges using the Rayleigh—Ritz method[J].Computers and Structures,1985,21(6):1095~1104
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[2]徐勋,卫星,刘德军,强士中.扁平曲线箱梁静动力特性分析[J].公路交通科技2007,(24)12:60~65
[3]周勇军,赵小星,贺栓海,等.弯钢箱梁桥的动力分析及模态试验[J].郑州大学学报,2005,26(4):20~24
[4]王根会,甘亚南.连续箱梁动力特性的理论分析研究[J].兰州交通大学学报,2004,23(4):1~4
[5]朱东生,刘世忠,虞庐松.曲线桥地震反应研究[J].中国公路学报,2002,15(3):42~48
[6]柳春光,焦双健.城市立交桥结构三维地震反应[J].地震工程与工程振动,2001,21(2):41~47
[7]柳春光,王前信.已建立交桥结构地震反应上限研究[J].地震工程与工程振动,2001,21(3):55~59
[8]Chang P C,Heins C P,Li G H,et a1.Seismic study ofcurved bridges using the Rayleigh—Ritz method[J].Computers and Structures,1985,21(6):1095~1104
[9]Scordelis A C,Wasti S T,Seible F.Structural response ofskew RC Box girder bridge[J].Journal of the StructuralDivision,ASCE 1982,108(1):89~104
[10]Chaudhuri S K,Shore S.Dynamics analysis of horizontallycurved I-girder bridges[J].Journal of the StructuralDivision,ASCE 1977,103:1589~1604
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