超长联大跨连续梁桥摩擦摆支座隔震研究
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摘要
基于某长周期超长联大跨度预应力混凝土连续梁桥梁,开展了摩擦摆支座的隔震研究。建立全桥有限元计算模型,采用双线性滞回模型模拟摩擦摆支座,输入50年超越概率2%的3条安评地震波进行了非线性时程反应分析及抗震性能验算。该联桥的分析表明,当摩擦摆支座的曲率半径为5m、滑动摩擦系数为0.03时,隔震后桥墩及桩基础的均处于弹性工作状态;支座顺、横桥向的最大水平滑动位移分别为207mm、198mm,在可按受的范围之内。超长联大跨连续梁桥有其自身的结构及受力特点,采用摩擦摆支座隔震时能显著地提高其抗震性能。
Isolation using friction pendulum bearings is utilized in a long span and super-long unit prestressed concrete continuous girder bridge with a long period. A finite element model of the full bridge is established, and a bilinear hysteretic model is used to simulate the friction pendulum bearings. A nonlinear time history response analysis is carried out by inputting three safety evaluation seismic motions with 50-year 2% exceedance probability and seismic performance as verification. The results show that when the friction pendulum bearings have a curvature radius of 5m and a coefficient of sliding friction of 0.03, the piers and its pile foundations behave elastically. The maximum displacements of the bearing are 207 mm and 198 mm in the horizontal and transverse directions, respectively. The displacements can easily be accommodated by the gap. Long span and super-long unit continuous beam bridges with long period have their own structural features; friction pendulum bearings can effectively improve their seismic performance.
Isolation using friction pendulum bearings is utilized in a long span and super-long unit prestressed concrete continuous girder bridge with a long period. A finite element model of the full bridge is established, and a bilinear hysteretic model is used to simulate the friction pendulum bearings. A nonlinear time history response analysis is carried out by inputting three safety evaluation seismic motions with 50-year 2% exceedance probability and seismic performance as verification. The results show that when the friction pendulum bearings have a curvature radius of 5m and a coefficient of sliding friction of 0.03, the piers and its pile foundations behave elastically. The maximum displacements of the bearing are 207 mm and 198 mm in the horizontal and transverse directions, respectively. The displacements can easily be accommodated by the gap. Long span and super-long unit continuous beam bridges with long period have their own structural features; friction pendulum bearings can effectively improve their seismic performance.
引文
[1]夏修身.铁路连续梁拱组合桥基于摩擦摆支座的减隔震研究[J].西北地震学报,2012,34(4):350―354.Xia Xiushen.Seismic isolation of combined system of continuous girder-arch railway bridge using friction pendulum bearing[J].Northwestern Seismological Journal,2012,34(4):350―354.(in Chinese)
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[8]叶爱君,范立础.附加阻尼器对超大跨度斜拉桥的减震效果[J].同济大学学报:自然科学版,2006,34(7):859―863.Ye Aijun,Fan Lichu.Seismic response reduction of a super-long-span cable-stayed bridge by adding dampers[J].Journal of Tongji University:Natural Science,2006,34(7):859―863.(in Chinese)
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[10]Skinner R I.An Introduction to Seismic Isolation[M].England:John Wiley&Sons,1993:2―4.
[2]何庭国,袁明,陈列,等.福厦铁路跨越乌龙江长联大跨连续梁桥设计[J].桥梁建设,2008(4):43―46.He Tingguo,Yuan Ming,Chen Lie,et al.Design of a long span and long continuous unit continuous girder bridge on section of Fuzhou-Xiamen railway spanning Eulong River[J].Bridge Construction,2008(4):43―46.(in Chinese)
[3]宋子威,蔡小培.粘滞性阻尼器在高速铁路长联大跨连续梁中的应用[J].清华大学学报(自然科学版),2012,52(8):1102―1105.Song Ziwei,Cai Xiaopei.Application of viscous damper devices in the seismic design of long span and long unit continuous girder bridges on speed high railway[J].Journal of Tsinghua University(Science and Technology),2012,52(8):1102―1105.(in Chinese)
[4]夏修身.铁路高墩抗震设计方法研究[D].兰州:兰州交通大学,2012.Xia Xiushen.Research on seismic design of tall piers for railway bridges[D].Lanhou:Lanzhou Jiaotong University,2012.(in Chinese)
[5]夏修身,赵会东,欧阳辉来.高速铁路桥梁基于摩擦摆支座的减隔震研究[J].工程抗震与加固改造,2014,36(3):21―26.Xia Xiushen,Zhao Huidong,Ouyang Huilai.Friction pendulum bearing for seismic isolation of high speed railway bridge[J].Earthquake Resistant Engineering and Retrofitting,2014,36(3):21―26.(in Chinese)
[6]Symans M D,Charney F A,Whittaker A S,et al.Energy dissipation systems for seismic applications:current practice and recent developments[J].Journal of Structural Engineering,2008,134(1):3―21.
[7]Zhongguo Guan,Jianzhong Li,Yan Xu.Performance test of energy dissipation bearing and its application in seismic control of a long-span bridge[J].Journal of Bridge Engineering,2009,15(6):622―630.
[8]叶爱君,范立础.附加阻尼器对超大跨度斜拉桥的减震效果[J].同济大学学报:自然科学版,2006,34(7):859―863.Ye Aijun,Fan Lichu.Seismic response reduction of a super-long-span cable-stayed bridge by adding dampers[J].Journal of Tongji University:Natural Science,2006,34(7):859―863.(in Chinese)
[9]夏修身,陈兴冲,王希慧,等.剪力键对隔震桥梁地震反应的影响[J].地震工程与工程振动,2012,32(6):104―109.Xia Xiushen,Chen Xingchong,Wang Xihui,et al.Effect of shear key on seismic response of bridge using isolation bearing[J].Earthquake Engineering and Engineering Vibration,2012,32(6):104―109.(in Chinese)
[10]Skinner R I.An Introduction to Seismic Isolation[M].England:John Wiley&Sons,1993:2―4.
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