土-结构相互作用对消能减震结构动力特性的影响
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摘要
基于系统化的集总数模型来表示土体的动力特性,建立土-消能减震结构相互作用体系的运动方程,采用复模态理论研究2个关键参数(土体剪切波速、结构高度与基础特征宽度的比值)对不同周期、不同阻尼比的减震结构动力特性的影响。研究表明:考虑土-结构相互作用后,非减震结构体系随着土体剪切波速的下降会加大整个体系的第一模态阻尼比;对于减震结构比,体系随着土体剪切波速的下降会削弱整个体系的阻尼比,且减震结构阻尼比越大,其削弱程度越明显。因此与普通结构相比,减震结构更需要考虑土-结构相互作用效应对其产生的不利影响。
The effects of soil-structure interaction(SSI) on dynamic characteristics of energy dissipating structures were investigated.Motion equations of soil-structure interaction energy dissipating structure were established with the soil dynamic characteristics described by systematic lumped-parameter model.Two parameters,such as soil shear wave velocity and the ratio of building height to foundation width,were used to investigate the effects on the dynamic characteristics energy dissipating structures under different periods and damping ratios by complex mode theory.It could concluded that,when SSI is considered,the first mode damping of structures without energy dissipation devices,increases when soil shear wave velocity decrease,while the contrary is the case for the structures with energy dissipation devices.Therefore,SSI had more effects on building with energy dissipation devices than building without devices.
The effects of soil-structure interaction(SSI) on dynamic characteristics of energy dissipating structures were investigated.Motion equations of soil-structure interaction energy dissipating structure were established with the soil dynamic characteristics described by systematic lumped-parameter model.Two parameters,such as soil shear wave velocity and the ratio of building height to foundation width,were used to investigate the effects on the dynamic characteristics energy dissipating structures under different periods and damping ratios by complex mode theory.It could concluded that,when SSI is considered,the first mode damping of structures without energy dissipation devices,increases when soil shear wave velocity decrease,while the contrary is the case for the structures with energy dissipation devices.Therefore,SSI had more effects on building with energy dissipation devices than building without devices.
引文
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[2]周福霖.工程结构减震控制[M].北京:地震出版社,1997.
[3]Chopra A K,Gutierrez J A.Earthquake response analysis of multi-story building including foundation interaction[J].Earthquake Engineering and Structural Dynamics,1974,3(1):65-77.
[4]Novak M.Effect of soil on structural response to wind and earth-quake[J].Earthquake Engineering and Structural Dynamics,1974,3(1):79-96.
[5]Constantinou M C,Kneifat M.Dynamics of soil-base-isolated structure systems[J].Journal of Structural Engineering,ASCE,1988,114(1):211-221.
[6]宋和平,吕西林.土体-结构相互作用对消能减震结构的影响[J].地震工程与工程振动,2009,29(1):162-168.
[7]张兆超.土-结构动力相互作用在消能减震控制中的作用探讨与研究[D].长沙:湖南大学,2009.
[8]Wu W H,Lee W H.Systematic lumped-parameter models for founda-tions based on polynomial-fraction approximation[J].Earthquake Engineering and Structural Dynamics,2002,31(7):1383-1412.
[9]Chuanromanee O.The influence of soil-structure interaction on the seismic response of structures with high damping[D].Michi-gan:University of Michigan,1995.
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