基于结构-桩-土相互作用的MR控制
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摘要
对于桩承高层建筑与周围土体组成的相互体系采用样条子域法、半解析无限元法和直梁的弯剪单元模型相耦合的方法进行建模,并结合瞬时最优控制算法,分析了其对结构磁流变(MR)阻尼器控制的影响作用。算例表明,考虑结构-桩-土相互作用与不考虑相互作用的固定端体系的控制计算结果有一定差异,该文计算的差值可达5%以上。考虑相互作用与不考虑相互作用相比,其地震反应减少了。如果不考虑相互作用,将使结构自身的耗能能力起不到相应的作用。在设计高层建筑的控制系统时一定要注意土-结构相互作用的影响,才能取得理想的控制效果。
The interaction system,which includes pi1e-supported tall buildings and the adjacent medium of soil,subject to the impact of earthquake is formulated in terms of the spline subdomain method,semi-analytical infinite element method and the bend-shear model of beam element,respectively.Taking advantage of the instantaneous optimal control algorithm,structure-piles-soil interaction effect on the magneto-rheological(MR) damper control is considered.It is shown that the structure control generates obvious different results between the interaction system and the fixed-end system.The response of the former may be 5 percent or more than the latter.The dissipative capability of the structural self will be omitted largely if the interaction isn't considered.To design the control system,especially for some tall buildings,soil-structure interaction should be taken into consideration.
The interaction system,which includes pi1e-supported tall buildings and the adjacent medium of soil,subject to the impact of earthquake is formulated in terms of the spline subdomain method,semi-analytical infinite element method and the bend-shear model of beam element,respectively.Taking advantage of the instantaneous optimal control algorithm,structure-piles-soil interaction effect on the magneto-rheological(MR) damper control is considered.It is shown that the structure control generates obvious different results between the interaction system and the fixed-end system.The response of the former may be 5 percent or more than the latter.The dissipative capability of the structural self will be omitted largely if the interaction isn't considered.To design the control system,especially for some tall buildings,soil-structure interaction should be taken into consideration.
引文
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[2]Wong H L,Luco J E.Structural control including soil-structure interaction effects[J].Journal of Engineering Mechanics,ASCE,1991,17:2237―2250.
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[5]吴京宁,楼梦麟.土-结构相互作用对高层建筑TMD控制的影响[J].同济大学学报(自然科学版),1997,25(5):515―520.Wu Jingning,Lou Menglin.Influence of soil-structure interaction on tuned mass damper control of high-rising buildings[J].Journal of Tongji University(Natural Science),1997,25(5):515―520.(in Chinese)
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[7]Smith H D,Wu W H,Borja R I.Structural control considering soil-structure interaction effects[J].Earthquake Engineering and Structural Dynamics,1994,23:609―626.
[8]田力.双塔高层建筑—多层地下室—桩—土系统动力相互作用研究[D].天津:天津大学,1996.Tian Li.Investigation on dynamic interaction system of tall building with double towers-multistory basement-pile-soil[D].Tianjin:Tianjin University,1996.(in Chinese)
[9]李忠献,樊素英,史志利,徐龙河.应用MRF-04K阻尼器的大跨连续刚构桥地震反应的半主动控制[J].土木工程学报,2005,38(8):74―79.Li Zhongxian,Fan Suying,Shi Zhili,Xu Longhe.Semi-active control on the seismic responses of long-span continuous rigid-framed bridges using MRF-04K damper[J].China Civil Engineering Journal,2005,38(8):74―79.(in Chinese)
[10]周云,徐龙河,李忠献.半主动磁流变阻尼控制结构的地震反应分析[J].地震工程与工程振动,2000,20(2):107―111.Zhou Yun,Xu Longhe,Li Zhongxian.Analysis for seismic responses of semi-active magnetorheological damping control structures[J].Earthquake Engineering and Engineering Vibration,2000,20(2):107―111.(in Chinese)
[2]Wong H L,Luco J E.Structural control including soil-structure interaction effects[J].Journal of Engineering Mechanics,ASCE,1991,17:2237―2250.
[3]李海岭,葛修润.土-结构动力相互作用影响的TMD控制研究[J].岩土力学,2000,20(1):40―44.Li Hailing,Ge Xiurun.Research on TMD control considering soil-structure interaction[J].Rock and Soil Mechanics,2000,20(1):40―44.(in Chinese)
[4]李海岭,葛修润.土-结构动力相互作用对隔震结构影响的模态分析方法[J].振动与冲击,2000,19(3):63―67.Li Hailing,Ge Xiurun.Modal analysis for seismically isolated structures with soil-structure dynamic interaction[J].Journal of Vibration and Shock,2000,19(3):63―67.(in Chinese)
[5]吴京宁,楼梦麟.土-结构相互作用对高层建筑TMD控制的影响[J].同济大学学报(自然科学版),1997,25(5):515―520.Wu Jingning,Lou Menglin.Influence of soil-structure interaction on tuned mass damper control of high-rising buildings[J].Journal of Tongji University(Natural Science),1997,25(5):515―520.(in Chinese)
[6]Smith H A,Wu W H.Effective optimal structural control of soil-structure interaction system[J].EarthquakeEngineering and Structual Dynamics,1997,26:549―570.
[7]Smith H D,Wu W H,Borja R I.Structural control considering soil-structure interaction effects[J].Earthquake Engineering and Structural Dynamics,1994,23:609―626.
[8]田力.双塔高层建筑—多层地下室—桩—土系统动力相互作用研究[D].天津:天津大学,1996.Tian Li.Investigation on dynamic interaction system of tall building with double towers-multistory basement-pile-soil[D].Tianjin:Tianjin University,1996.(in Chinese)
[9]李忠献,樊素英,史志利,徐龙河.应用MRF-04K阻尼器的大跨连续刚构桥地震反应的半主动控制[J].土木工程学报,2005,38(8):74―79.Li Zhongxian,Fan Suying,Shi Zhili,Xu Longhe.Semi-active control on the seismic responses of long-span continuous rigid-framed bridges using MRF-04K damper[J].China Civil Engineering Journal,2005,38(8):74―79.(in Chinese)
[10]周云,徐龙河,李忠献.半主动磁流变阻尼控制结构的地震反应分析[J].地震工程与工程振动,2000,20(2):107―111.Zhou Yun,Xu Longhe,Li Zhongxian.Analysis for seismic responses of semi-active magnetorheological damping control structures[J].Earthquake Engineering and Engineering Vibration,2000,20(2):107―111.(in Chinese)
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