大跨度斜拉桥顺桥向阻尼约束体系研究
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摘要
为探讨E型钢阻尼器和液体粘滞阻尼器对大跨度斜拉桥的减震限位效果,以某(55+135+400+135+55)m半飘浮体系双塔斜拉桥为背景,设计2种阻尼约束减震体系方案。采用通用有限元程序SAP2000建立桥梁动力分析模型,通过参数分析确定较为合理的减隔震设计参数,选取3条人工地震波分析2种阻尼约束减震体系方案对该桥地震响应的影响规律。分析结果表明:选取的E型钢阻尼器和液体粘滞阻尼器均可有效控制地震作用中斜拉桥主梁的水平位移,采用液体粘滞阻尼器时塔底弯矩增幅相对较小,主梁水平位移控制效果相对较好。综合考虑减震限位效果及综合使用性能,在该斜拉桥中推荐使用液体粘滞阻尼器约束减震体系方案。
To study the effect of seismic mitigation and displacement limiting of the E-shape steel dampers and fluid viscous dampers used for long span cable-stayed bridge,a semi-floating system cable-stayed bridge with double pylons and with span arrangement(55+135+400+135+55)m was cited as an example and two damping restraint system schemes for the seismic mitigation and displacement limiting were designed.The dynamic analysis model for the bridge was established by the universal finite element program SAP2000,the rational seismic mitigation and isolation design parameters were determined on the basis of the parametric analysis and three artificial seismic waves were selected to analyze the laws of influence of the two damping restraint system schemes on the seismic responses of the bridge.The results of the analysis indicate that both the selected E-shape steel dampers and fluid viscous dampers can effectively control the horizontal displacement of the main girder of the cable-stayed bridge under the seismic action.When the fluid viscous dampers are used,the increase of bending moment in the pylon footings is relatively little and the effect of the horizontal displacement control of the main girder is relatively good.In consideration of the effect of the seismic mitigation and displacement limiting and the comprehensive service performance of the dampers,the fluid viscous damper scheme is finally recommended for use in the cable-stayed bridge.
To study the effect of seismic mitigation and displacement limiting of the E-shape steel dampers and fluid viscous dampers used for long span cable-stayed bridge,a semi-floating system cable-stayed bridge with double pylons and with span arrangement(55+135+400+135+55)m was cited as an example and two damping restraint system schemes for the seismic mitigation and displacement limiting were designed.The dynamic analysis model for the bridge was established by the universal finite element program SAP2000,the rational seismic mitigation and isolation design parameters were determined on the basis of the parametric analysis and three artificial seismic waves were selected to analyze the laws of influence of the two damping restraint system schemes on the seismic responses of the bridge.The results of the analysis indicate that both the selected E-shape steel dampers and fluid viscous dampers can effectively control the horizontal displacement of the main girder of the cable-stayed bridge under the seismic action.When the fluid viscous dampers are used,the increase of bending moment in the pylon footings is relatively little and the effect of the horizontal displacement control of the main girder is relatively good.In consideration of the effect of the seismic mitigation and displacement limiting and the comprehensive service performance of the dampers,the fluid viscous damper scheme is finally recommended for use in the cable-stayed bridge.
引文
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[8]张常勇,钟铁毅,季文刚.铁路连续梁桥横向减隔震支座参数研究[J].中国铁道科学,2011,32(4):19-23.(ZHANG Chang-yong,ZHONG Tie-yi,JI Wen-gang.Study on the Parameters of the Transverse Seismic Isolation Bearings of Railway Continuous Beam Bridge[J].China Railway Science,2011,32(4):19-23.in Chinese)
[9]潘晋,吴成亮,仝强,等.E型钢阻尼器数值仿真及试验研究[J].振动与冲击,2009,28(7):192-195.(PAN Jin,WU Cheng-liang,TONG Qiang,et al.Numerical Simulation and Experimental Study on EShape Steel Damper[J].Journal of Vibration and Shock,2009,28(7):192-195.in Chinese)
[10]李世珩,陈彦北,胡宇新,等.E型钢阻尼器及其在桥梁工程中的应用[J].铁道建筑,2012,(1):1-4.(LI Shi-heng,CHEN Yan-bei,HU Yu-xin,et al.EShaped Steel Damper and Its Application in Bridge Engineering[J].Railway Engineering,2012,(1):1-4.in Chinese)
[11]Nicos M,Constantinous M C,Dargush G F.Analytical Model of Viscoelastic Fluid Dampers[J].Journal of Structural Engineering,1993,119(11):3 310-3 325.
[12]王志强,胡世德,范立础.东海大桥粘滞阻尼器参数研究[J].中国公路学报,2005,18(3):37-42.(WANG Zhi-qiang,HU Shi-de,FAN Li-chu.Research on Viscous Damper Parameters of Donghai Bridge[J].China Journal of Highway and Transport,2005,18(3):37-42.in Chinese)
[2]叶爱君,胡世德,范立础.斜拉桥抗震结构体系研究[J].桥梁建设,2002,(4):1-4.(YE Ai-jun,HU Shi-de,FAN Li-chu.Research on Aseismatic Structural System of Cable-Stayed Bridge[J].Bridge Construction,2002,(4):1-4.in Chinese)
[3]李忠献,黄健,丁阳,等.不同地震激励下大跨度斜拉桥的地震反应分析[J].中国公路学报,2005,18(3):48-53.(LI Zhong-xian,HUANG Jian,DING Yang,et al.Seismic Responses of Long-Span Cable-Stayed Bridges Under Different Patterns of Earthquake Excitations[J].China Journal of Highway and Transport,2005,18(3):48-53.in Chinese)
[4]杨喜文,张文华,李建中.大跨度斜拉桥横桥向减震研究[J].地震工程与工程振动,2012,32(1):86-92.(YANG Xi-wen,ZHANG Wen-hua,LI Jian-zhong.Study of Transverse Seismic Mitigation of Long-Span Cable-Stayed Bridge[J].Journal of Earthquake Engineering and Engineering Vibration,2012,32(1):86-92.in Chinese)
[5]彭伟,彭天波,李建中.多塔斜拉桥纵向约束体系研究[J].同济大学学报(自然科学版),2009,37(8):1 003-1 009.(PENG Wei,PENG Tian-bo,LI Jian-zhong.Research on Longitudinal Constraint Systems for Multi-Pylon Cable-Stayed Bridges[J].Journal of Tongji University(Natural Science),2009,37(8):1 003-1 009.in Chinese)
[6]周大兴,闫维明,陈彦江,等.千米级斜拉桥的减震控制[J].公路交通科技,2011,28(12):71-75.(ZHOU Da-xing,YAN Wei-ming,CHEN Yan-jiang,et al.Seismic Mitigation Control of Cable-Stayed Bridge with Span Length Longer Than 1 000 M[J].Journal of Highway and Transportation Research and Development,2011,28(12):71-75.in Chinese)
[7]徐艳,段昕智,李建中.强震作用下斜拉桥纵桥向非线性地震反应分析[J].华南理工大学学报(自然科学版),2012,40(6):132-138.(XU Yan,DUAN Xin-zhi,LI Jian-zhong.Analysis of Nonlinear Seismic Response of Cable-Stayed Bridge Subjected to Longitudinal Strong Ground Motions[J].Journal of South China University of Technology(Natural Science Edition),2012,40(6):132-138.in Chinese)
[8]张常勇,钟铁毅,季文刚.铁路连续梁桥横向减隔震支座参数研究[J].中国铁道科学,2011,32(4):19-23.(ZHANG Chang-yong,ZHONG Tie-yi,JI Wen-gang.Study on the Parameters of the Transverse Seismic Isolation Bearings of Railway Continuous Beam Bridge[J].China Railway Science,2011,32(4):19-23.in Chinese)
[9]潘晋,吴成亮,仝强,等.E型钢阻尼器数值仿真及试验研究[J].振动与冲击,2009,28(7):192-195.(PAN Jin,WU Cheng-liang,TONG Qiang,et al.Numerical Simulation and Experimental Study on EShape Steel Damper[J].Journal of Vibration and Shock,2009,28(7):192-195.in Chinese)
[10]李世珩,陈彦北,胡宇新,等.E型钢阻尼器及其在桥梁工程中的应用[J].铁道建筑,2012,(1):1-4.(LI Shi-heng,CHEN Yan-bei,HU Yu-xin,et al.EShaped Steel Damper and Its Application in Bridge Engineering[J].Railway Engineering,2012,(1):1-4.in Chinese)
[11]Nicos M,Constantinous M C,Dargush G F.Analytical Model of Viscoelastic Fluid Dampers[J].Journal of Structural Engineering,1993,119(11):3 310-3 325.
[12]王志强,胡世德,范立础.东海大桥粘滞阻尼器参数研究[J].中国公路学报,2005,18(3):37-42.(WANG Zhi-qiang,HU Shi-de,FAN Li-chu.Research on Viscous Damper Parameters of Donghai Bridge[J].China Journal of Highway and Transport,2005,18(3):37-42.in Chinese)
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