多塔斜拉桥纵向部分约束体系的减震优化控制研究
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摘要
以六塔斜拉桥型的嘉绍大桥为工程背景,研究了多塔斜拉桥采用纵向部分约束体系的地震反应特点,在此基础上详细考察了多塔斜拉桥纵向部分约束体系采用黏滞阻尼器的减震控制特性及其减振优化控制方法。研究结果表明:(1)多塔斜拉桥采用部分塔梁纵向固结的约束体系,其减震控制目标是减小塔梁部分固结造成的"内力集中效应";(2)多塔斜拉桥设置黏滞阻尼器可以显著减小塔梁固结处的塔底内力反应和桥塔与主梁间的纵向相对位移反应,但会明显增大塔梁自由处的塔底内力反应,并略微增大主梁与桥墩间的纵向相对位移反应;(3)黏滞阻尼器的阻尼系数与多塔斜拉桥塔底总内力的关系曲线为一单峰凹凸曲线,阻尼系数与塔底内力不均匀分布系数和阻尼器最大输出力的关系曲线为一单调变化曲线。根据这一变化特性,分别选取塔底总内力和塔底内力不均匀分布系数作为目标函数建立了多塔斜拉桥纵向部分约束体系的减震优化控制方法。
With regard to a six-tower cable-stayed bridge-Jiashao Bridge,the characteristics of seismic responses of multi-tower cable-stayed bridges using partially constrained system under earthquake actions were analyzed,on the basis of which the vibration control effect and optimal control method on multi-tower cable-stayed bridges using partially constrained system were analyzed with the viscous damper. The analysis results reveal that:( 1) The objective of seismic control on multi-tower cable-stayed bridges using partially constrained system is to reduce the effect of internal force concentration due to the partially constraint between the bridge tower and girder;( 2) The installation of viscous damper can significantly reduce the internal force at the bottom of the bridge tower restrained with the girder and the longitudinal relative displacement between the girder and towers. However,the internal force at the bottom of the bridge tower unrestrained with the girder can be significantly increased and the longitudinal relative displacement between the girder and piers can be increased a little;( 3) The relationship between the damping coefficient of viscous dampers and total force at the bottom of all bridge towers is single concave convex curve. And the relationship between the damping coefficient and non-uniform distribution coefficient of bridge towers is monotone curve together with the maximum damping force of viscous dampers. According to these curves,the optimalseismic control method for multi-tower cable-stayed bridges using partially constrained system is presented using the objective functions of total force at the bottom of all bridge towers and non-uniform distribution coefficient of bridge towers,respectively.
With regard to a six-tower cable-stayed bridge-Jiashao Bridge,the characteristics of seismic responses of multi-tower cable-stayed bridges using partially constrained system under earthquake actions were analyzed,on the basis of which the vibration control effect and optimal control method on multi-tower cable-stayed bridges using partially constrained system were analyzed with the viscous damper. The analysis results reveal that:( 1) The objective of seismic control on multi-tower cable-stayed bridges using partially constrained system is to reduce the effect of internal force concentration due to the partially constraint between the bridge tower and girder;( 2) The installation of viscous damper can significantly reduce the internal force at the bottom of the bridge tower restrained with the girder and the longitudinal relative displacement between the girder and towers. However,the internal force at the bottom of the bridge tower unrestrained with the girder can be significantly increased and the longitudinal relative displacement between the girder and piers can be increased a little;( 3) The relationship between the damping coefficient of viscous dampers and total force at the bottom of all bridge towers is single concave convex curve. And the relationship between the damping coefficient and non-uniform distribution coefficient of bridge towers is monotone curve together with the maximum damping force of viscous dampers. According to these curves,the optimalseismic control method for multi-tower cable-stayed bridges using partially constrained system is presented using the objective functions of total force at the bottom of all bridge towers and non-uniform distribution coefficient of bridge towers,respectively.
引文
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[7]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),2009,3(8):1003-1009.PENG Wei,PENG Tianbo,LI Jianzhong.Research on longitudinal constraint systems for multispan cable-stayed bridges[J].Journal of Tongji University(Natural Science),2009,3(8):1003-1009.(in Chinese)
[8]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 Aijun,HU Shide,FAN Lichu.Seismic displancement control for super-long-span cable-stayed bridges[J].China Civil Engineering Journal,2004,37(12):38-43.(in Chinese)
[9]Raheem S E A,Hayashikawa T,Dorka U.Ground motion spatial variability effects on seismic response control of cable-stayed bridges[J].Earthquake Engineering and Engineering Vibration,2011,10(1):37-49.
[10]Li H,Liu J L,Ou J P.Investigation of seismic damage of cable-stayed bridges with different connection configuration[J].Journal of Earthquake and Tsunami,2009,3(3):227-247.
[11]泰勒公司液体黏滞阻尼器在桥梁上应用的设计.http://www.bluelakeint.com/chinese/kangzhen/bridge02.htm
[2]Ni Y Q,Wang J Y,Lo L C.Influence of stabilizing cables on seismic response of a multi-span cable-stayed bridge[J].Computer-aided Civil and Infrastructure Engineering,2005,20(2):142-153.
[3]Michel Virlogenux.Bridges with multiple cable-stayed spans[J].Structural Engineering International,2001,11(1):61-82.
[4]Su C,Han D J,Yan Q S,et al.Wind-induced vibration analysis of the Hong Kong Ting Kau Bridge[C].Proceedings of The Institution of Civil Engineers-Structures and Buildings.2003,156(3):263-272.
[5]方圆,邓育林,李建中.大跨多塔斜拉桥动力特性及抗震性能研究[J].结构工程师,2009,25(5):72-77.FANG Yuan,DENG Yulin,LI Jianzhong.Discussion on dynamic characteristics and seismic responses of a long-span multi-tower cable-stayed bridge[J].Structural Engineers,2009,25(5):72-77.(in Chinese)
[6]方圆,李建中,彭天波,等.行波效应对多塔斜拉桥的地震分析[J].振动与冲击,2010,29(10):148-152.FANG Yuan,LI Jianzhong,PENG Tianbo,et al.Influence of traveling-wave effect on seismic response of a long-span multi-tower cable stayed bridge[J].Journal of Vibration and Shock,2010,29(10):148-152.(in Chinese)
[7]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),2009,3(8):1003-1009.PENG Wei,PENG Tianbo,LI Jianzhong.Research on longitudinal constraint systems for multispan cable-stayed bridges[J].Journal of Tongji University(Natural Science),2009,3(8):1003-1009.(in Chinese)
[8]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 Aijun,HU Shide,FAN Lichu.Seismic displancement control for super-long-span cable-stayed bridges[J].China Civil Engineering Journal,2004,37(12):38-43.(in Chinese)
[9]Raheem S E A,Hayashikawa T,Dorka U.Ground motion spatial variability effects on seismic response control of cable-stayed bridges[J].Earthquake Engineering and Engineering Vibration,2011,10(1):37-49.
[10]Li H,Liu J L,Ou J P.Investigation of seismic damage of cable-stayed bridges with different connection configuration[J].Journal of Earthquake and Tsunami,2009,3(3):227-247.
[11]泰勒公司液体黏滞阻尼器在桥梁上应用的设计.http://www.bluelakeint.com/chinese/kangzhen/bridge02.htm
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