高烈度区连续梁桥减震的粘滞阻尼器参数分析
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摘要
连续梁桥应用广泛,其损害占据桥梁工程地震灾害中的重要部分,有必要对连续梁桥进行专门的抗震设计,而安装粘滞阻尼器是改善桥梁结构抗震性能的有效手段之一。以位于地震高烈度区的太白大桥为例,通过有限元计算研究了设置粘滞阻尼器对预应力混凝土连续梁桥地震响应的影响,并重点针对阻尼器的阻尼系数和速度指数进行参数分析。结果表明:设置阻尼器后,固定墩墩底弯矩、边墩主梁相对位移都显著减小;各墩受力更趋均匀;阻尼器阻尼力随阻尼系数C增大而增大,随速度指数α增大而减小。所得结论可供高烈度区连续梁桥的减震设计参考。
Installing viscous dampers is one of the effective measures to improve the seismic performance of continuous bridges.Taking the Taibai Bridge located in high-intensity seismic zone as an example,the influence of viscous dampers on seismic responses of a prestressed concrete continuous bridge was investigated,and the parametric analyses of the damping coefficient and velocity exponent were carried out.Results show that both the bending moment at the bottom of the fixed pier and the longitudinal relative displacement between the main girder and the side pier are significantly reduced when the viscous dampers have been installed.Moreover,the seismic forces on the piers become more evenly distributed.The damping forces of the dampers increase with the increase of damping coefficient,and decrease with the increase of velocity exponent.The results can provide reference to seismic design of continuous bridges in high intensity region.
Installing viscous dampers is one of the effective measures to improve the seismic performance of continuous bridges.Taking the Taibai Bridge located in high-intensity seismic zone as an example,the influence of viscous dampers on seismic responses of a prestressed concrete continuous bridge was investigated,and the parametric analyses of the damping coefficient and velocity exponent were carried out.Results show that both the bending moment at the bottom of the fixed pier and the longitudinal relative displacement between the main girder and the side pier are significantly reduced when the viscous dampers have been installed.Moreover,the seismic forces on the piers become more evenly distributed.The damping forces of the dampers increase with the increase of damping coefficient,and decrease with the increase of velocity exponent.The results can provide reference to seismic design of continuous bridges in high intensity region.
引文
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[12]王浩,李爱群,郭彤.超大跨悬索桥地震响应的综合最优控制研究[J].湖南大学学报(自然科学版),2006,33(3):6-10.WANG Hao,LI Ai-qun,GUO Tong.Compositive optimalcontrol of the seismic response for super-long-span suspensionbridges[J].Journal of Hunan University(NaturalSciences),2006,33(3):6-10.
[13]Ingham T J,Santiago R,Charles S.Use of dampers in theseismic retrofit of the Golden Gate bridge[C].New York:ASCE,1997:1219-1223.
[14]郭磊,李建中,范立础.大跨度连续梁桥减隔震设计研究[J].土木工程学报,2006,39(3):81-85.GUO Lei,LI Jian-zhong,FAN Li-chu.Research on seismicisolation design for long-span continuous bridges[J].ChinaCivil Engineering Journal,2006,39(3):81-85.
[15]殷海军,王志强,胡世德.连续梁桥设置阻尼器参数分析[J].同济大学学报,2004,32(11):1437-1441.YIN Hai-jun,WANG Zhi-qiang,HU Shi-de.Analysis ofcontinuous bridge adopted dampers[J].Journal of TongjiUniversity,2004,32(11):1437-1441.
[16]龚一琼,胡勃,袁万成,等.连续梁桥的减隔震设计[J].同济大学学报,2001,29(1):94-98.GONG Yi-qiong,HU Bo,YUAN Wan-cheng,et al.Seismicisolation design of continuous girder bridges[J].Journal ofTongji University,2001,29(1):94-98.
[17]余钱华,夏培华,宋泽冈,等.大跨长联预应力混凝土连续梁桥地震响应[J].重庆交通大学学报,2009,28(1):1-4.YU Qian-hua,XIA Pei-hua,SONG Ze-gang,et al.Seismicresponse of the large span pre-stressed concrete continuousgirder bridge[J].Journal of Chongqing Jiaotong University,2009,28(1):1-4.
[2]Makris N,Constantinou M C.Viscous dampers:testing,modeling and application in vibration and seismic isolation[R].Buffalo:National Center for Earthquake Engineeringand Research,1990:28-30.
[3]Constantinou M C,Symans M D.Experimental study ofseismic response of buildings with supplemental fluid dampers[J].Struct Design Tall Buildg,1993,2(2):93-132.
[4]Constantinou M C.Application of fluid viscous dampers toearthquake resistant design[R].Buffalo:National Center forEarthquake Engineering and Research,1994:73-80.
[5]Tsopelas P,Constantinou M C,Okamoto S,et al.Experimental study of bridge seismic sliding isolation systems[J].Engng Struct,1996,18(3):1-10.
[6]Makris N,Chang S.Effect of viscous,viscoplastic andfriction damping on the response of seismic isolated structures[J].Earthquake Engng Struct Dynam,2000,29(1):85-107.
[7]叶正强,李爱群,程文瀼,等.采用粘滞流体阻尼器的工程结构减振设计研究[J].建筑结构学报,2001,22(4):61-66.YE Zheng-qiang,LI Ai-qun,CHENG Wen-rang,et al.Study on vibration energy dissipation design of structures withfluid viscous dampers[J].Journal of Building Structures,2001,22(4):61-66.
[8]Madhekar S N,Jangid R S.Variable dampers for earthquakeprotection of benchmark highway bridges[J].SmartMaterials and Structures 2009,18(11):1-18.
[9]叶爱君,胡世德,范立础.超大跨度斜拉桥的地震位移控制[J].土木工程学报,2004,37(12):38-43.YE Ai-jun,HU Shi-de,FAN Li-chu.Seismic displacementcontrol for super-long-span cable-stayed bridges[J].ChinaCivil Engineering Journal,2004,37(12):38-43.
[10]吴从晓,周云,邓雪松,等.高位转换粘滞阻尼减震结构阻尼器合理阻尼系数研究[J].振动与冲击,2011,30(3):180-184.WU Cong-xiao,ZHOU Yun,DENG Xue-song.Optimaldamping coefficient of viscous damper in high-level transferstory structure[J].Journal of Vibration and Shock,2011,30(3):180-184.
[11]Soneji B B,Jangid R S.Passive hybrid systems forearthquake protection of cable-stayed bridge[J].EngngStruct,2007,29(1):57-70.
[12]王浩,李爱群,郭彤.超大跨悬索桥地震响应的综合最优控制研究[J].湖南大学学报(自然科学版),2006,33(3):6-10.WANG Hao,LI Ai-qun,GUO Tong.Compositive optimalcontrol of the seismic response for super-long-span suspensionbridges[J].Journal of Hunan University(NaturalSciences),2006,33(3):6-10.
[13]Ingham T J,Santiago R,Charles S.Use of dampers in theseismic retrofit of the Golden Gate bridge[C].New York:ASCE,1997:1219-1223.
[14]郭磊,李建中,范立础.大跨度连续梁桥减隔震设计研究[J].土木工程学报,2006,39(3):81-85.GUO Lei,LI Jian-zhong,FAN Li-chu.Research on seismicisolation design for long-span continuous bridges[J].ChinaCivil Engineering Journal,2006,39(3):81-85.
[15]殷海军,王志强,胡世德.连续梁桥设置阻尼器参数分析[J].同济大学学报,2004,32(11):1437-1441.YIN Hai-jun,WANG Zhi-qiang,HU Shi-de.Analysis ofcontinuous bridge adopted dampers[J].Journal of TongjiUniversity,2004,32(11):1437-1441.
[16]龚一琼,胡勃,袁万成,等.连续梁桥的减隔震设计[J].同济大学学报,2001,29(1):94-98.GONG Yi-qiong,HU Bo,YUAN Wan-cheng,et al.Seismicisolation design of continuous girder bridges[J].Journal ofTongji University,2001,29(1):94-98.
[17]余钱华,夏培华,宋泽冈,等.大跨长联预应力混凝土连续梁桥地震响应[J].重庆交通大学学报,2009,28(1):1-4.YU Qian-hua,XIA Pei-hua,SONG Ze-gang,et al.Seismicresponse of the large span pre-stressed concrete continuousgirder bridge[J].Journal of Chongqing Jiaotong University,2009,28(1):1-4.
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