三跨飞燕式异型钢管混凝土拱桥地震反应及控制
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摘要
利用ANSYS有限元软件,计算并分析了某三跨飞燕式异型钢管混凝土拱桥的动力特性和一致激励与行波激励下的动力响应,并对拟安装在桥上Lock-up装置的减震效果进行了评价。研究表明,纵向和竖向联合输入下结构的动力反应明显高于纵向和竖向单独输入工况;横向地震激励时,拱肋出平面位移及内力均很大,但可以不考虑行波效应的影响;纵向和竖向地震激励下,行波输入时主拱肋面内动力响应急剧增大;Lock-up装置使得结构在纵向地震激励下由半漂浮体系转化为刚接体系,一致输入下结构内力响应减震率较低,而行波输入减震率则相对较高,其中,主拱肋轴力减震率达15%,弯矩减震率最大达35%。
Based on an irregular concrete-filled steel tube arch bridge,the 3-D spatial finite element model is built by ANSYS to complete the dynamic characteristic analysis and seismic response of the bridge under uniform excitation and non-uniform excitation.Seismic response control effectiveness of Lock-up devices is calculated then.The result shows the seismic response under the combination of longitudinal and vertical excitation input is apparently larger than the seismic response under longitudinal or vertical excitation input.Under transverse excitation,large out-plane seismic internal force and displacement are arrived,and the traveling wave effect need not considered.However,the in-plane seismic response increases rapidly under longitudinal or vertical excitation input with consideration of traveling wave effect.With Lock-up devices fixed on,the aseismic ratio of the axial force and the bending moment of the arch rib is not obvious,but can reach 15% and 35% under traveling seismic wave excitation.
Based on an irregular concrete-filled steel tube arch bridge,the 3-D spatial finite element model is built by ANSYS to complete the dynamic characteristic analysis and seismic response of the bridge under uniform excitation and non-uniform excitation.Seismic response control effectiveness of Lock-up devices is calculated then.The result shows the seismic response under the combination of longitudinal and vertical excitation input is apparently larger than the seismic response under longitudinal or vertical excitation input.Under transverse excitation,large out-plane seismic internal force and displacement are arrived,and the traveling wave effect need not considered.However,the in-plane seismic response increases rapidly under longitudinal or vertical excitation input with consideration of traveling wave effect.With Lock-up devices fixed on,the aseismic ratio of the axial force and the bending moment of the arch rib is not obvious,but can reach 15% and 35% under traveling seismic wave excitation.
引文
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[2]Zong Zhou-Hong,Bijaya Jaishi,Ge Ji-Ping.Dynamicanalysis of a half-through concrete-filled steel tubulararch bridge[J].Engineering Structures,2005,27(1):3～15
[3]李静斌,葛素娟,陈淮,等.5跨连续中承式钢管混凝土拱桥抗震性能分析[J].世界地震工程,2005,21(3):110～115Li Jing-bin,Ge Su-juan,Chen Huai,et al.Seismicbehavior analysis of a 5-span continuous half-throughCFST arch bridge[J].World Information onEarthquake Engineering,2005,21(3):110～115(inChinese)
[4]张鹏,张大长,孙雷,等.设置阻尼支撑对钢管混凝土拱桥纵桥向减震效果的分析[J].南京工业大学学报,2007,29(3):87～93Zhang Peng,Zhang Da-chang,Sun Lei,et al.Analysison vibration reduction of CFST arch bridge with dampingbraces in span direction[J].Journal of NanjingUniversity of Technology,2007,29(3):87～93(inChinese)
[5]彭伟,李建中.附加限位装置对钢管混凝土拱桥的减震效果[J].工程抗震与加固改造,2008,30(5):61～68Peng Wei;Li Jian-zhong.Seismic Response Reductionof An Arch Bridge by Adding Seismic Restrainers[J].Earthquake Resistant Engineering and Retrofitting,2008,30(5):61～68(in Chinese)
[6]JTG/T B02-01-2008,公路桥梁抗震设计细则[S]JTG/T B02-01-2008,Guidelines for Seismic Design ofHighway Bridges[S](in Chinese)
[7]Edward L Wilson.Three-dimensional static and dynamicanalysis of structure[M].Computers and Structures,Inc.,1995:318～322
[8]陈宝春.钢管混凝土拱桥[M].北京:人民交通出版社,2007:807～829Chen Bao-chun.Concrete filled tubular arch bridges[M].Beijing:China Communications Press,2007:807～829(in Chinese)
[9]Robert Jankowski,Krzysztof Wilde,Yozo Fujino.Reduction of pounding effects in elevated bridges duringearthquakes[J].Earthquake Engng Struct.Dyn.2000,29:195～212
[10]王志强,葛继平.粘滞阻尼器和lock-up装置在连续梁桥抗震中的应用[J].石家庄铁道学院学报,2006,19(1):5～9Wang Zhi-qiang,Ge Ji-ping.Application of ViscousDamper and Lock-up Devices in the Seismic Design ofContinuous Girder Bridges[J].Journal of ShijiazhuangRailway Institute,2006,19(1):5～9(in Chinese)
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