大跨度斜拉桥结构横向消能减震设计方法
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摘要
桥梁消能减振技术是通过在桥梁结构上合理设置耗能装置来增加结构阻尼、吸收地震等其它外界因素作用下的振动能量,减小结构的振动反应。本文结合杭州湾大桥工程南航道桥,提出在斜拉桥主梁与过渡墩、辅助墩之间沿横向设置粘滞阻尼器,来控制大跨桥梁的横向地震反应。分析表明,采用阻尼消能减震技术,不仅可有效地减少大跨桥梁的横向地震反应,而且还可同时限制桥面横向温度变形,保护伸缩缝。
The damped energy-dissipated technique of bridges is to increase the damping of structures,to absorb the vibration energy due to earthquake and other external factors,and then to reduce the response of structures by installing energy dissipation devices in bridges.Based on the project of the south channel bridge of the Hangzhou bay bridge engineering,the viscous dampers are proposed to install between the deck and transition auxiliary piers to reduce the transversal seismic response of the bridge structure.Analysis shows that the transversal earthquake reaction of the bridge can be reduced effectively,the deck transversal displacement will be restricted and the failure of the expansion joints will be prevented as well by adopting resonable layout of structural system and dampers.
The damped energy-dissipated technique of bridges is to increase the damping of structures,to absorb the vibration energy due to earthquake and other external factors,and then to reduce the response of structures by installing energy dissipation devices in bridges.Based on the project of the south channel bridge of the Hangzhou bay bridge engineering,the viscous dampers are proposed to install between the deck and transition auxiliary piers to reduce the transversal seismic response of the bridge structure.Analysis shows that the transversal earthquake reaction of the bridge can be reduced effectively,the deck transversal displacement will be restricted and the failure of the expansion joints will be prevented as well by adopting resonable layout of structural system and dampers.
引文
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[2]Song T T,D argush G F.Pass ive Energy D iss ipationSystem in S tructure Eng ineering[M].S tate U n ivers ityof N ew Y ork,Bu ffa lo,1997.
[3]刘伟庆,魏琏,韦承基等.低周反复荷载作用下摩擦阻尼支撑框架的试验研究[J].土木工程学报,1996,(5):3—10.
[4]刘伟庆,魏琏,丁大钧.摩擦耗能支撑钢筋混凝土框架结构的振动台试验研究[J].建筑结构学报,1997,(3):29—37.
[5]Housner G W,B ergm an L A,C anghey T K,et a l.S tructure con tro l:past,presen t,and the fu ture[J].Journa l of Eng ineering M echan ics,1997,123(9):897—971.
[6]F rieder SE IBLE,G ianm ario BENZON I,A ndreF IL IATRAULT,et a l.Perform ance va lidation oflarge se ism ic response m od ification dev ices[A].P roceed ing of 12W CEE[C].2000,paper ID:1154.
[7]周云,周福霖,李新平.桥梁震害与减震防灾新对策[J].世界地震工程,1997,(1):8—15.
[8]陈开利,刘海燕.美国金门桥的抗震加固[J].国外桥梁,1999,(3):47—51.
[9]杨宜谦,张煅,周宏业,等.振动控制技术在桥梁工程中的应用[J].中国铁路,1998,(3):7—11.
[10]Edw ard L W ilson.T hree-D im ens iona l S tatic andD ynam ic A na lys is of S tructures[M].T h ird Ed ition,R eprin t January 2002,Com pu ters and S tructures,Inc.
[11]吴晓兰.大跨度斜拉桥结构阻尼消能减震技术研究[D].南京:南京工业大学,2004.
[12]范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].上海:人民交通出版社,2001.
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