多维多点激励下大跨度连体高层结构减振研究
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摘要
针对连体高层结构连廊跨度不断增大的趋势,在多维多点地震激励下采用黏滞阻尼器对其进行了减振研究.首先从主动线性二次型调节(LQR)理论出发推导了阻尼器的主动最优控制力以指导阻尼器选型,进而通过在一大跨度连体高层结构算例在一致激励以及多维多点激励下对其进行了减振数值模拟研究.结果表明在连体高层结构上布置黏滞阻尼器可以有效减小地震响应并提高其抗震安全性,但同时也发现地震动空间效应会使减振效果发生明显波动,因此在设计减振方案后应考虑不同地震激励条件对减振效果进行验证.
As the span of connected structure becomes larger,vibration controls using viscous dampers on long-span connected structures are studied under multi-dimensional and multi-supported earthquake excitation.The optimal control force is first derived with linear quedratic regulator(LQR)active control theory,and then a simulation example is given under both uniform and multi-dimensional and multi-supported excitations.Simulation results show that the viscous damper can efficiently reduce the responses and enhance the aseismic safety of the structure.However,results also show that the control efficiency may vary a lot due to earthquake spatial effect.Therefore,simulation should be performed under different earthquake inputs when we design the control scheme.
As the span of connected structure becomes larger,vibration controls using viscous dampers on long-span connected structures are studied under multi-dimensional and multi-supported earthquake excitation.The optimal control force is first derived with linear quedratic regulator(LQR)active control theory,and then a simulation example is given under both uniform and multi-dimensional and multi-supported excitations.Simulation results show that the viscous damper can efficiently reduce the responses and enhance the aseismic safety of the structure.However,results also show that the control efficiency may vary a lot due to earthquake spatial effect.Therefore,simulation should be performed under different earthquake inputs when we design the control scheme.
引文
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[2]陈学伟,韩小雷,林生逸,等.中洲中心二期结构抗震性能分析[J].建筑结构学报,2010,31(1):101-109.
[3]中国住房和城乡建设部.JGJ3—2010高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2010.
[4]Wang J,Cooke N,Moss P J.The response of a 344mlong bridge to non-uniform earthquake ground motions[J].Engineering Structures,2009,31(11):2554-2567.
[5]Ohsaki M.Sensitivity of optimum designs for spatially varying ground motions[J].Journal of Structural Engineering,2001,127(11):1324-1329.
[6]林伟,陈尚鸿,祁皑,等.多维多点激励下大跨度连体高层结构地震反应分析[J].福州大学学报:自然科学版,2011,39(6):923-929.
[7]Ha D,Park J H,Park K S,et al.Optimization of complex dampers for the improvement of seismic performance of long-span bridges[J].KSCE Journal of Civil Engineering,2009,14(1):33-40.
[8]Carvalhal R,Lopes V J,Brennan M J.An efficient modal control strategy for the active vibration control of a truss structure[J].Shock and Vibration,2007,14(6):393-406.
[9]Jung H J,Spencer B F Jr,Ni Y Q,et al.State-of-the-art of semiactive control systems using MR fluid dampers in civil engineering applications[J].Structural Engineering and Mechanics,2004,17(3/4):493-526.
[10]李忠献,林伟,丁阳.多维地震激励下空间结构MR阻尼器半主动控制[J].天津大学学报:自然科学版,2007,40(5):512-518.
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