大跨飘浮体系斜拉桥减震控制研究
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摘要
以一座大跨斜拉桥为实例,建立其有限元模型计算分析了主动控制、半主动控制和被动控制对飘浮体系斜拉桥的减震效果,并分析了地震行波效应对斜拉桥地震反应的影响。结果表明,不同频谱成分的地震动输入显著影响三种控制方法的减震效果;半主动控制对于该斜拉桥整体地震反应的控制效果优于始终提供最大阻尼力的被动控制;行波效应对该斜拉桥无控制和有控制地震反应的影响基本相同,并且行波效应对三种控制方法减震效果的不利影响很小。这为漂浮体系斜拉桥的减震控制提供了理论上的指导。
Vibration-suppressing effectiveness of active control, semi-active control and passive control for a long-span floating cable-stayed bridge is calculated and analyzed with its finite element model. Effect of seismic traveling wave on the seismic responses of the cable-stayed bridge is also analyzed. The results indicate that ground motion inputs with various frequency components evidently influence the vibration-suppressing effectiveness of the three control methods. Semi-active control is better than passive control always providing the max damping force for the control effectiveness of the whole seismic response. Influence of seismic traveling wave on the uncontrolled seismic response of the bridge is almost the same as that on the controlled seismic response. Traveling wave can make bad influence on the beam of the bridge, but it is beneficial to the bridge tower. Its bad influence on the three control methods is little. This study provides theoretic guide to vibration control for floating cable-stayed bridges.
Vibration-suppressing effectiveness of active control, semi-active control and passive control for a long-span floating cable-stayed bridge is calculated and analyzed with its finite element model. Effect of seismic traveling wave on the seismic responses of the cable-stayed bridge is also analyzed. The results indicate that ground motion inputs with various frequency components evidently influence the vibration-suppressing effectiveness of the three control methods. Semi-active control is better than passive control always providing the max damping force for the control effectiveness of the whole seismic response. Influence of seismic traveling wave on the uncontrolled seismic response of the bridge is almost the same as that on the controlled seismic response. Traveling wave can make bad influence on the beam of the bridge, but it is beneficial to the bridge tower. Its bad influence on the three control methods is little. This study provides theoretic guide to vibration control for floating cable-stayed bridges.
引文
[1]欧进萍.结构振动控制———主动、半主动和智能控制[M]北京:科学出版社,2003.
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[4]史志利.大跨度桥梁多点激励地震反应分析与MR阻尼器控制[D]:[博士学位论文].天津:天津大学,2003.
[5]王成博,史志利,李忠献.大跨度斜拉桥地震反应MR阻尼器半主动控制[J].天津大学学报,2005,38(2):95—101.
[6]DAI Ze-bing,HUANG Jin-zhi,WANG Hong-xia.Semi-activ control of a cable-stayed bridge under multiple-support excita tions[J],Journal of Zhejiang University SCIENCE,2004,5(3):317—325.
[7]代泽兵,黄金枝,王红霞.基于智能阻尼器的大跨度斜拉桥多支承激励地震振动控制[J].振动与冲击,2005,24(2)66—70.
[8]金江,刘红梅,洪俊青.利用SMA进行桅杆振动控制的研究[J].振动与冲击,2004,23(3):103—110.
[9]陈幼平,周宏业.斜拉桥地震反应特性[J].中国铁道科学1996,17(1):1—8.
[2]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[3]刘士林,梁智涛,候金龙,孟凡超.斜拉桥[M].北京:人民交通出版社,2002.
[4]史志利.大跨度桥梁多点激励地震反应分析与MR阻尼器控制[D]:[博士学位论文].天津:天津大学,2003.
[5]王成博,史志利,李忠献.大跨度斜拉桥地震反应MR阻尼器半主动控制[J].天津大学学报,2005,38(2):95—101.
[6]DAI Ze-bing,HUANG Jin-zhi,WANG Hong-xia.Semi-activ control of a cable-stayed bridge under multiple-support excita tions[J],Journal of Zhejiang University SCIENCE,2004,5(3):317—325.
[7]代泽兵,黄金枝,王红霞.基于智能阻尼器的大跨度斜拉桥多支承激励地震振动控制[J].振动与冲击,2005,24(2)66—70.
[8]金江,刘红梅,洪俊青.利用SMA进行桅杆振动控制的研究[J].振动与冲击,2004,23(3):103—110.
[9]陈幼平,周宏业.斜拉桥地震反应特性[J].中国铁道科学1996,17(1):1—8.
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