小半径曲线桥地震损伤破坏数值模拟及FPS减震研究
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摘要
为探求城市小半径曲线桥地震损伤破坏过程,并探讨FPS支座在其中的减隔震应用,本文以汶川地震中某小半径曲线匝道桥为研究对象,通过Open SEES建立能考虑弯剪耦合效应的非线性时程反应分析原桥模型,探讨小半径曲线桥的损伤模拟方法;此后采用考虑动轴力和双方向耦合的single FPBearing单元模拟FPS支座的受力特性,并通过支座试验确定其Vel Normal Frc Dep摩擦属性各参数取值,进行该匝道桥FPS减隔震数值模拟分析。结果表明:对比实际震害,原桥模型可较为准确地模拟出桥墩受弯剪破坏规律和失效形式,真实地反映桥梁受地震作用响应规律;对比原桥模型,FPS减隔震模型可有效降低桥墩的地震反应,防止曲线桥发生地震损伤。通过合理的单元参数取值,在Open SEES软件中single FPBearing单元及Vel Normal Frc Dep摩擦属性可以准确地模拟FPS支座的受力性能。
In order to explore the seismic damage and damage process of the small radius curved bridge in the city,and to carry out the application of FPS bearing in the earthquake,based on a small radius curved bridge in Wenchuan earthquake,this paper establishes a nonlinear time-history analysis model which can consider bending-shear coupling by Open SEES to discuss the damage simulation method of small radius curved bridge. Then the numerical simulation of FPS bearing-curved bridge isolation is carried out based on the single FPBearing model considering the dynamic force and the double-direction coupling bearing unit,through the bearing test to determine the Vel Normal Frc Dep friction properties of various parameters. The results show that,compared with the actual earthquake damage,the original bridge model can accurately reflect the seismic response of the bridge,truely reflect the response of bridges to earthquakes; compared with the original bridge model,the FPS seismic isolation model can effectively reduce the seismic response of bridge piers and prevent earthquake damage of curved bridges. Through reasonable unit parameters,the single FPBearing unit and Vel Normal Frc Dep friction properties of Open SEES can accurately simulate the performance of the FPS bearing.
In order to explore the seismic damage and damage process of the small radius curved bridge in the city,and to carry out the application of FPS bearing in the earthquake,based on a small radius curved bridge in Wenchuan earthquake,this paper establishes a nonlinear time-history analysis model which can consider bending-shear coupling by Open SEES to discuss the damage simulation method of small radius curved bridge. Then the numerical simulation of FPS bearing-curved bridge isolation is carried out based on the single FPBearing model considering the dynamic force and the double-direction coupling bearing unit,through the bearing test to determine the Vel Normal Frc Dep friction properties of various parameters. The results show that,compared with the actual earthquake damage,the original bridge model can accurately reflect the seismic response of the bridge,truely reflect the response of bridges to earthquakes; compared with the original bridge model,the FPS seismic isolation model can effectively reduce the seismic response of bridge piers and prevent earthquake damage of curved bridges. Through reasonable unit parameters,the single FPBearing unit and Vel Normal Frc Dep friction properties of Open SEES can accurately simulate the performance of the FPS bearing.
引文
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[2]Tsai C S,Chiang T C,Chen B J.Finite element formulations and theoretical study for variable curvature friction pendulum system[J].Engineering Structures,2003,25(14):1719-1730
[3]Constantinou M C.Friction Pendulum double concave bearing[J].NEES Report,2004
[4]吴陶晶,李建中,管仲国.双向耦合效应对FPS隔震桥梁地震响应的影响[J].振动与冲击,2011,30(2):119-123Wu Tao-jing,Li Jian-zhong,Guan Zhong-guo.Effect of bidirectional coupling effect on seismic response of FPSisolated bridges[J].Journal of Vibration and Shock,2011,30(2):119-123(in Chinese)
[5]顾正伟,钟铁毅,张贞阁.双曲面球型减隔震支座曲线连续梁桥的减隔震[J].中国铁道科学,2011,32(3):47-51Gu Zheng-wei,Zhong Tie-yi,Zhang Zhen-ge.Seismic isolation of curved continuous girder bridge with hypoid vibrating seismic isolation[J].China Railway Science,2011,32(3):47-51(in Chinese)
[6]Ates S,Constantinou M C.Example of application of response spectrum analysis for seismically isolated curved bridges including soil-foundation effects[J].Soil Dynamics and Earthquake Engineering,2011,31(4):648-661
[7]Ates S,Constantinou M C.Example of application of response history analysis for seismically isolated curved bridges on drilled shaft with springs representing soil[J].Soil Dynamics and Earthquake Engineering,2011,31(3):334-350
[8]王煦,董军,焦驰宇.纵向碰撞下FPS隔震曲线桥地震响应分析[J].工程抗震与加固改造,2015,37(6):64-70Wang Xu,Dong Jun,Jiao Chi-yu.Seismic response analysis of FPS isolated curved bridge under longitudinal collision[J].Earthquake Resistant Engineering and Retrofitting,2015,37(6):64-70(in Chinese)
[9]孙治国,王东升,郭迅,等.汶川大地震绵竹市回澜立交桥震害调查[J].地震工程与工程振动,2009,29(4):132-138Sun Zhi-guo,Wang Dong-sheng,Guo Xun,et al.Characteristics of earthquake damage in Mianzhu city on Wenchuan earthquake[J].Earthquake Engineering and Engineering Vibration,2009,29(4):132-138(in Chinese)
[10]Elwood K J.Shake table tests and analytical studies on the gravity load collapse of reinforced concrete frames[D].University of California,Berkeley,2002
[11]孙治国,陈灿,司炳君,等.考虑非线性剪切效应的RC桥墩抗震分析模型.[J].工程力学,2015,32(5):28-36Sun Zhi-guo,Chen Chan,Si Bing-jun,et al.Seismic analysis model of RC bridge piers with nonlinear shear effect[J].Engineering Mechanics,2015,32(5):28-36(in Chinese)
[12]Eroz M,DesRoches R.Bridge seismic response as a function of the friction pendulum system(FPS)modeling assumptions[J].Engineering Structures,2008,30(11):3204-3212
[13]焦驰宇,胡世德,管仲国.FPS抗震支座分析模型的比较研究[J].振动与冲击,2007,26(10):113-117Jiao Chi-yu,Hu Shi-de,Guan Zhong-guo.Comparative analysis of FPS seismic bearing analysis models[J].Journal of Vibration and Shock,2007,26(10):113-117(in Chinese)
[14]王建强,管品武,李大望.摩擦摆基础隔震结构双向地震反应分析[J].世界地震工程,2005,21(3):11-12Wang Jian-qiang,Guan Pin-wu,Li Da-wang.Analysis of bidirectional seismic response of base structures with friction pendulum[J].World Earthquake Engineering,2005,21(3):11-12(in Chinese)