多维地震激励作用下大跨度斜拉拱桥的随机响应
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摘要
以一种新颖钢管混凝土拱桥-斜拉钢管混凝土拱组合桥为研究对象,通过建立空间结构有限元模型,利用子空间迭代法得到结构的自振特性,并运用随机响应理论分别对该桥在纵向激励、纵+竖向激励、纵+横向激励、纵+竖+横向激励等4种工况作用下的地震响应与相同跨径的中承式钢管混凝土拱桥进行了对比分析。分析结果表明,地震横向激励对斜拉拱桥的响应特性有较大的影响,在多维随机地震激励作用下,由于斜拉索的存在使得斜拉拱桥的横向抗震性能优于相同跨径的中承式钢管混凝土拱桥,这为大跨度斜拉拱桥的抗震设计和研究提供了理论依据。
A 3D finite element model for a long span cable-stayed concreted-filled steel tubular arch bridge was established.Based on the model and the dynamical equation of MDOF structural system,natural vibration characteristics was obtained by use of subspace iterative method.In addition,3D seismic response of this bridge was studied by means of the random vibration theory subjected to longitudinal excitation,longitudinal and vertical excitation,longitudinal and transverse excitation and 3D excitation.Compared to the seismic response of this bridge with the same span arch bridge induced by the earthquake excitation,the results show that,the effect of transverse excitation lateral stability on the subject bridge is notable;the whole aseismatic capabilities of the subject bridge is better than that of long span concrete-filled steel tube(CFST) arch bridge under multi-component seismic excitation oweing to the existing of stay cables.It provides a theoretic basis for seismic design and study of cable-stayed arch bridge.
A 3D finite element model for a long span cable-stayed concreted-filled steel tubular arch bridge was established.Based on the model and the dynamical equation of MDOF structural system,natural vibration characteristics was obtained by use of subspace iterative method.In addition,3D seismic response of this bridge was studied by means of the random vibration theory subjected to longitudinal excitation,longitudinal and vertical excitation,longitudinal and transverse excitation and 3D excitation.Compared to the seismic response of this bridge with the same span arch bridge induced by the earthquake excitation,the results show that,the effect of transverse excitation lateral stability on the subject bridge is notable;the whole aseismatic capabilities of the subject bridge is better than that of long span concrete-filled steel tube(CFST) arch bridge under multi-component seismic excitation oweing to the existing of stay cables.It provides a theoretic basis for seismic design and study of cable-stayed arch bridge.
引文
[1]赵跃宇,吕建根,易壮鹏.斜拉拱桥的力学性能及经济性能的研究[J].世界桥梁,2005(1):29-32.ZHAO Yue-yu,LV Jian-gen,YI Zhuang-peng.Study of Me-chanical Behavior and Economy of Cable-stayed Arch Bridge[J].World Bridges,2005(1):29-32.
[2]赵跃宇,劳文全,冯锐,等.内倾角对钢管混凝土提篮拱力学性能影响的分析[J].公路交通科技,2007,24(3):56-58.ZHAO Yue-yu,LAO Wen-quan,FENG Rui,et al.Effects ofLeaning Angle on Concrete-filled Steel Tube x Arch Bridge’sMechanical Properties Analysis[J].Journal of Highway andTransportation Research an Development,2007,24(3):56-58.
[3]赵跃宇,杨相展,康厚军.斜拉拱桥动力特性分析[J].公路,2005(11):36-39.ZHAO Yue-yu,YANG Xiang-zhan,KANG Hou-jun.Analysisof Dynamic Characters for Cable-stayed Arch Bridge[J].Highway,2005(11):36-39.
[4]林家浩.随机地震响应功率谱的快速算法[J].地震工程与工程振动,1990,8(9):38-49.LIN Jia-hao.A Fast Algorithm for Power Spectra of RandomSeismic Responses[J].Earthquake Engineering and Vibra-tion,1990,8(9):38-49.
[5]LIN J H,ZHAO Y,ZHANG Y H.Accurate and Highly Effi-cient Algorithms for Structure Stationary/Non-stationary RandomResponses[J].Computer Methods in Applied Mechanics andEngineering,2001,191(1/2):103-114.
[6]LIN J H,ZHANG Y H,LI Q S,et al.Seismic Spatial Ef-fects for Long-span Bridges Using the Pseudo Excitation Method[J].Engineering Structures,2004,26:1 207-1 216.
[7]赵灿晖.大跨度钢管混凝土拱桥的地震响应研究[D].成都:西南交通大学,2001.ZHAO Can-hui.Study of Seismic Response for long-span archbridge[D].Chengdu:Southwest Jiaotong University,2001.
[8]李国豪.工程结构抗震动力学[M].上海:上海科学技术出版社,1980.LI Guo-hao.Dynamics of Earthquake Resistance of EngineeringStructures[M].Shanghai:Shanghai Science and TechnologyPress,1980.
[9]CLOUGH R W,PENZIEN J.Dynamics of Structures[M].New York:McGraw-Hill Inc.,1993.
[10]欧进萍,牛荻涛,杜修力.设计用随机地震动的模型及其参数确定[J].地震工程与工程振动,1993,11(3):45-53.OU Jin-ping,NIU Di-tao,DU Xiu-li.Random EarthquakeGround Motion Model and Its Parameter Determination Used inAseismic Deisgn[J].Earthquake engineering and vibration,1993,11(3):45-53.
[11]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Li-chu.Earthquake Resistance of Bridge[M].Shan-ghai:Tongji University Press,1997.
[2]赵跃宇,劳文全,冯锐,等.内倾角对钢管混凝土提篮拱力学性能影响的分析[J].公路交通科技,2007,24(3):56-58.ZHAO Yue-yu,LAO Wen-quan,FENG Rui,et al.Effects ofLeaning Angle on Concrete-filled Steel Tube x Arch Bridge’sMechanical Properties Analysis[J].Journal of Highway andTransportation Research an Development,2007,24(3):56-58.
[3]赵跃宇,杨相展,康厚军.斜拉拱桥动力特性分析[J].公路,2005(11):36-39.ZHAO Yue-yu,YANG Xiang-zhan,KANG Hou-jun.Analysisof Dynamic Characters for Cable-stayed Arch Bridge[J].Highway,2005(11):36-39.
[4]林家浩.随机地震响应功率谱的快速算法[J].地震工程与工程振动,1990,8(9):38-49.LIN Jia-hao.A Fast Algorithm for Power Spectra of RandomSeismic Responses[J].Earthquake Engineering and Vibra-tion,1990,8(9):38-49.
[5]LIN J H,ZHAO Y,ZHANG Y H.Accurate and Highly Effi-cient Algorithms for Structure Stationary/Non-stationary RandomResponses[J].Computer Methods in Applied Mechanics andEngineering,2001,191(1/2):103-114.
[6]LIN J H,ZHANG Y H,LI Q S,et al.Seismic Spatial Ef-fects for Long-span Bridges Using the Pseudo Excitation Method[J].Engineering Structures,2004,26:1 207-1 216.
[7]赵灿晖.大跨度钢管混凝土拱桥的地震响应研究[D].成都:西南交通大学,2001.ZHAO Can-hui.Study of Seismic Response for long-span archbridge[D].Chengdu:Southwest Jiaotong University,2001.
[8]李国豪.工程结构抗震动力学[M].上海:上海科学技术出版社,1980.LI Guo-hao.Dynamics of Earthquake Resistance of EngineeringStructures[M].Shanghai:Shanghai Science and TechnologyPress,1980.
[9]CLOUGH R W,PENZIEN J.Dynamics of Structures[M].New York:McGraw-Hill Inc.,1993.
[10]欧进萍,牛荻涛,杜修力.设计用随机地震动的模型及其参数确定[J].地震工程与工程振动,1993,11(3):45-53.OU Jin-ping,NIU Di-tao,DU Xiu-li.Random EarthquakeGround Motion Model and Its Parameter Determination Used inAseismic Deisgn[J].Earthquake engineering and vibration,1993,11(3):45-53.
[11]范立础.桥梁抗震[M].上海:同济大学出版社,1997.FAN Li-chu.Earthquake Resistance of Bridge[M].Shan-ghai:Tongji University Press,1997.
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