大跨连续梁桥纵向消能减震振动台模型试验
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摘要
为研究大跨连续梁桥在纵向设置粘滞阻尼器后的结构地震响应和减震效果,以青岛海湾大桥为工程背景,制作完成了3跨连续梁桥(1个固定墩、3个自由墩)的1/20缩尺比例模型,并进行了常规设计桥梁及在自由墩顶和桥面主梁之间纵向增置粘滞阻尼器桥梁的振动台对比试验。研究结果表明:设置阻尼器的连续梁桥模型,在地震激励下结构阻尼逐渐增加,主梁位移反应减小,固定墩墩底内力减小,有利于连续梁桥整体协同受力,且减震效果随地震烈度的增加而逐渐明显;合理选择阻尼器参数,可以在小震、中震、大震作用下均取得较好的减震效果。
In order to investigate the earthquake response and seismic-reduced effect of long-span continuous girder bridge with longitudinal viscous dampers,regarded Qingdao Gulf Bridge as engineering background,a 1/20 scale model of three-span continuous girder bridge(one fixed pier and three free piers) was designed and studied under shaking table test,in which three viscous dampers were installed between the tops of free piers and the girder in longitudinal direction.The research results indicate that under earthquake excitation,the damping ratio of continuous girder bridge structure with damper increases rapidly;at the same time,the main girder's displacements and the fixed pier's internal forces reduce.The seismic-reduced effects of girder's displacements and the fixed pier's forces increase when the input earthquake intensity gets stronger.Selecting suitable parameters of damper can get good seismic energy dissipating effect.
In order to investigate the earthquake response and seismic-reduced effect of long-span continuous girder bridge with longitudinal viscous dampers,regarded Qingdao Gulf Bridge as engineering background,a 1/20 scale model of three-span continuous girder bridge(one fixed pier and three free piers) was designed and studied under shaking table test,in which three viscous dampers were installed between the tops of free piers and the girder in longitudinal direction.The research results indicate that under earthquake excitation,the damping ratio of continuous girder bridge structure with damper increases rapidly;at the same time,the main girder's displacements and the fixed pier's internal forces reduce.The seismic-reduced effects of girder's displacements and the fixed pier's forces increase when the input earthquake intensity gets stronger.Selecting suitable parameters of damper can get good seismic energy dissipating effect.
引文
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[13]GB 50011—2001,建筑抗震设计规范[S].GB 50011—2001,Code for Seismic Design of Build-ings[S].
[2]胡聿贤.地震工程学[M].2版.北京:地震出版社,2006.HU Yu-xian.Earthquake Engineering[M].2nd ed.Beijing:Earthquake Press,2006.
[3]ZHOU Fu-lin,HUANG Dong-yang,TAN Ping.Dy-namic Analysis on Pool-type Tuned Mass Damper[J].Journal of Architecture and Civil Engineering,2007,24(4):1-6.
[4]CONSTANTINOU M C,SYMANS M D.Experimen-tal and Analytical Investigation of Seismic Responseof Structures with Supplemental Fluid Viscous Damp-ers[R].Buffalo:NCEER,1992.
[5]刘健新,李加武.中国西部地区桥梁风工程研究[J].建筑科学与工程学报,2005,22(4):32-39.LIU Jian-xin,LI Jia-wu.Study of Wind Project ofBridge in Western Area of China[J].Journal ofArchitecture and Civil Engineering,2005,22(4):32-39.
[6]胡大琳,黄小国,赵国辉,等.考虑结构-水相互作用的连续刚构桥水平地震反应分析[J].建筑科学与工程学报,2008,25(2):79-84.HU Da-lin,HUANG Xiao-guo,ZHAO Guo-hui,et al.Horizontal Seismic Response Analysis of ContinuousRigid Frame Bridges Considering Structure-waterInteraction[J].Journal of Architecture and CivilEngineering,2008,25(2):79-84.
[7]楼梦麟,雍国柱,李建元.阻尼特性对组合结构地震反应的影响[J].建筑科学与工程学报,2007,24(2):24-29.LOU Meng-lin,YONG Guo-zhu,LI Jian-yuan.Influ-ence of Damping Characteristics on Seismic Responsesof Composite Structures[J].Journal of Architectureand Civil Engineering,2007,24(2):24-29.
[8]龚一琼,胡勃,袁万城,等.连续梁桥的减隔震设计[J].同济大学学报:自然科学版,2001,29(1):94-98.GONG Yi-qiong,HU Bo,YUAN Wan-cheng,et al.Seismic Isolation Design of Continuous Girder Bridges[J].Journal of Tongji University:Natural Science,2001,29(1):94-98.
[9]陈政清.斜拉索风雨振现场观测与振动控制[J].建筑科学与工程学报,2005,22(4):5-10.CHEN Zheng-qing.On-site Observation of Wind-rainInduced Vibration of Stay Cables and Its Control[J].Journal of Architecture and Civil Engineering,2005,22(4):5-10.
[10]张永健,黄平明.考虑剪力滞效应的简支箱梁自振特性[J].建筑科学与工程学报,2005,22(2):40-42.ZHANG Yong-jian,HUANG Ping-ming.Free Vibra-tion Characteristics of Simply Supported Box Girderwith Effect of Shear Lag[J].Journal of Architectureand Civil Engineering,2005,22(2):40-42.
[11]张春浓.隔震桥梁的理论分析与震动台试验研究[D].北京:北京工业大学,2004.ZHANG Chun-nong.Theoretical Analysis andShaking Table Test of Isolated Bridges[D].Beijing:Beijing University of Technology,2004.
[12]周颖,卢文胜,吕西林.模拟地震振动台模型实用设计方法[J].结构工程师,2003(3):30-33.ZHOU Ying,LU Wen-sheng,LU Xi-lin.PracticalModel Design Method of Shaking Table Tests[J].Structural Engineers,2003(3):30-33.
[13]GB 50011—2001,建筑抗震设计规范[S].GB 50011—2001,Code for Seismic Design of Build-ings[S].
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