不同激励下大跨度CFST拱桥地震反应时程分析
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摘要
以茅草街大桥为研究对象,基于ANSYS软件建立了该大跨度中承式钢管混凝土(CFST)系杆拱桥的三维有限元模型,并对其进行了自振特性分析,获得了结构的自振频率和振型。以此为基础,结合以Fortran PowerStation 4.0为平台编制的计算程序对茅草街大桥的地震反应进行了空间非线性时程分析,计算了一致、行波和多点输入下该桥的地震反应,分析比较了不同激励方式对于大跨度CFST拱桥地震反应的影响。结果表明,行波输入对该桥地震反应最为不利,使得结构关键截面内力显著增加;多点输入对结构地震反应的影响比较复杂,使有些构件内力反应增加,有些减小,但增加和减小的幅度不大。
The demonstrated Maocaojie Bridge is a concrete-filled steel tube(CFST)arch bridge with a main span of 368m.It is the 3 largest CFST arch bridge in the world.Based on ANSYS,a 3-dimensional finite element model for the bridge is established and the dynamic behavior of the bridge is then analyzed.On the basis of which the seismic response time-history analysis of the bridge under consistent excitation,multiple-point excitation and traveling wave excitation are carried out.The response of forces and displacements in key sections of the bridge under different excitations are investigated and compared with each other.Results show that the structural responses are closely related to the way of seismic excitations.The bridge is most dangerous by use of the traveling wave excitation,under which the structural responses of key sections are increased obviously;while the structural responses is complicatedly affected by the multiple-point excitation,under which the structural responses of some sections are increased,but others are decreased.
The demonstrated Maocaojie Bridge is a concrete-filled steel tube(CFST)arch bridge with a main span of 368m.It is the 3 largest CFST arch bridge in the world.Based on ANSYS,a 3-dimensional finite element model for the bridge is established and the dynamic behavior of the bridge is then analyzed.On the basis of which the seismic response time-history analysis of the bridge under consistent excitation,multiple-point excitation and traveling wave excitation are carried out.The response of forces and displacements in key sections of the bridge under different excitations are investigated and compared with each other.Results show that the structural responses are closely related to the way of seismic excitations.The bridge is most dangerous by use of the traveling wave excitation,under which the structural responses of key sections are increased obviously;while the structural responses is complicatedly affected by the multiple-point excitation,under which the structural responses of some sections are increased,but others are decreased.
引文
[1]陈宝春.钢管混凝土拱桥设计与施工[M].北京:人民交通出版社,1999.
[2]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
[3]郑史雄,周述华.大跨度钢管混凝土拱桥的地震反应性能[J].西南交通大学学报,1999,34(3):320~325.
[4]茅草街大桥静动力分析报告[R].中南大学土木建筑学院2002,7.
[5]王浩,李爱群,乔建东等.土-桩-结构相互作用对大跨度CFST拱桥地震反应的影响研究[J].东南大学学报,2005,35(3):433~437.
[6]王浩.基于ANSYS的茅草街大桥地震反应分析[D].长沙:中南大学硕士学位论文,2004.
[7]刘涛,杨凤鹏.精通ANSYS[M].北京:清华大学出版社,2002.
[8]M.J.N.普瑞斯特勒,F.塞勒勒,G.M.卡尔维.桥梁抗震设计与加固[M].袁万城,胡勃,崔飞,等(译).北京:人民交通出版社,1997.
[2]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京:人民交通出版社,2001.
[3]郑史雄,周述华.大跨度钢管混凝土拱桥的地震反应性能[J].西南交通大学学报,1999,34(3):320~325.
[4]茅草街大桥静动力分析报告[R].中南大学土木建筑学院2002,7.
[5]王浩,李爱群,乔建东等.土-桩-结构相互作用对大跨度CFST拱桥地震反应的影响研究[J].东南大学学报,2005,35(3):433~437.
[6]王浩.基于ANSYS的茅草街大桥地震反应分析[D].长沙:中南大学硕士学位论文,2004.
[7]刘涛,杨凤鹏.精通ANSYS[M].北京:清华大学出版社,2002.
[8]M.J.N.普瑞斯特勒,F.塞勒勒,G.M.卡尔维.桥梁抗震设计与加固[M].袁万城,胡勃,崔飞,等(译).北京:人民交通出版社,1997.
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