基于虚拟激励法的大跨度斜拉拱桥随机响应
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摘要
通过建立空间结构有限元模型,利用一种计算效率很高的随机振动理论—虚拟激励法对大跨度斜拉拱桥的随机振动地震响应进行了研究。将该桥的动力特性以及由施加于该桥纵向激励、纵+竖向激励、横+竖向激励、纵+竖+横向激励所得到的随机振动地震响应,与相同跨径的钢管混凝土拱桥进行对比分析,可以得到:大跨度斜拉拱桥中斜拉索的存在改善了主拱肋拱脚附近的受力,提高了拱桥的抗震性能。
In this paper,a highly efficient random vibration algorithm,the pseudo-excitation method(PEM),is developed for the random vibration analysis of seismic responses of a long-span cable-stayed arch bridge. The dynamic characteristics and seismic response behavior of the bridge subjected to longitudinal excitation,longitudinal and vertical excitation,transverse and vertical excitation,three-dimensional excitation are studied.Compared to the same span arch bridge,the exist of the cables reinforces the arch springing against seismic force and improves aseismatic characteristic of arch bridge.
In this paper,a highly efficient random vibration algorithm,the pseudo-excitation method(PEM),is developed for the random vibration analysis of seismic responses of a long-span cable-stayed arch bridge. The dynamic characteristics and seismic response behavior of the bridge subjected to longitudinal excitation,longitudinal and vertical excitation,transverse and vertical excitation,three-dimensional excitation are studied.Compared to the same span arch bridge,the exist of the cables reinforces the arch springing against seismic force and improves aseismatic characteristic of arch bridge.
引文
[1]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。
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[3]Lin JH,Zhao Y,Zhang YH.Accurate and Highly Effi-cient Algorithms for Structure Stationary/Non-stationaryRandom Responses[J].Computer Methods in AppliedMechanics and Engineering,2001,191(1-2):103~114.
[4]Lin JH,Zhang YH,Li QS,Williams FW.Seismic SpatialEffects for Long-span Bridges Using the Pseudo ExcitationMethod[J].Engineering Structures,2004,26:1207~1216.
[5]Lin JH,Zhang YH,Li QS,Williams F W.Seismic Spa-tial Effects for Long-span Bridges in Nonstationary Inho-mogeneous Random Fields[J].Earthquake Engineeringand Engineering Vibration,2005,4(1):75~82.
[6]Li QS,Zhang YH,WUJR,Lin JH.Seismic Random Vi-bration Analysis of Tall Buildings[J].Engineering Struc-tures,2004,26:1767~1778.
[7]Lin JH.A Fast CQC Algorithm of PSD Matrices for Ran-dom Seismic Responses[J].Computers and Structures,1992,44(3):683~687.
[8]Clough RW,Penzien J.Dynamics of Structures.NewYork:McGraw-Hill Inc;1993.
[9]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。
[10]王解军.车辆荷载作用下大跨桥梁的随机振动[J].中南公路工程,2003,28(4):20~23。
[2]JTJ 004-89,公路工程抗震设计标准[S].
[3]Lin JH,Zhao Y,Zhang YH.Accurate and Highly Effi-cient Algorithms for Structure Stationary/Non-stationaryRandom Responses[J].Computer Methods in AppliedMechanics and Engineering,2001,191(1-2):103~114.
[4]Lin JH,Zhang YH,Li QS,Williams FW.Seismic SpatialEffects for Long-span Bridges Using the Pseudo ExcitationMethod[J].Engineering Structures,2004,26:1207~1216.
[5]Lin JH,Zhang YH,Li QS,Williams F W.Seismic Spa-tial Effects for Long-span Bridges in Nonstationary Inho-mogeneous Random Fields[J].Earthquake Engineeringand Engineering Vibration,2005,4(1):75~82.
[6]Li QS,Zhang YH,WUJR,Lin JH.Seismic Random Vi-bration Analysis of Tall Buildings[J].Engineering Struc-tures,2004,26:1767~1778.
[7]Lin JH.A Fast CQC Algorithm of PSD Matrices for Ran-dom Seismic Responses[J].Computers and Structures,1992,44(3):683~687.
[8]Clough RW,Penzien J.Dynamics of Structures.NewYork:McGraw-Hill Inc;1993.
[9]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。
[10]王解军.车辆荷载作用下大跨桥梁的随机振动[J].中南公路工程,2003,28(4):20~23。
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