土-结构-TMD体系振动台模型试验与数值模拟对比研究
Comparison between shaking table test and numerical modelling of soil-structure-TMD system
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摘要: 为了分析土与结构相互作用效应(SSI)对结构控制的影响,将地基土、上部结构和调谐质量阻尼器(TMD)组合成4种结构体系,在同一地震激励下,分别对其进行振动台试验。运用土与结构动力相互作用三维有限元分析软件SASSI2000对4种结构体系分别建立模型,并对各种试验工况下的结构地震反应进行了数值模拟计算。计算中,采用三维八结点实体单元模拟结构的基础部分,每个结点有3个自由度;上部结构采用集中质量模型;采用等效线性化模型考虑土的动力非线性影响。对振动台模型试验与数值模拟结果的比较表明,两者得到的SSI效应对TMD减震控制性能的影响表现出相似的规律性,SSI效应对结构的减震控制效果有很大影响。Abstract: In the shaking table test, to research the effect of SSI on structural control, soil, super structure and TMD structure are combined to four sorts of structure system.Each system is tested on shaking table under the same seismic excitation. Numerical modelling of every structure system is performed by SASSI2000 program for 3D finite element analysis of soilstructure interaction in this paper. In the analysis, the foundation of structure is simulated by 3D solid elements with three translational DOFS per node. The super structure is simulated by beam element and 3D mass matrix. The site consists of semiinfinite viscoelatic horizontal layers on a rigid base. The dynamic nonlinear effects of soils are considered by using equivalent linear method. The comparisons between test results and calculated results show that the test and calculation laws of SSI effects on structural control are coincident. SSI effects have an important influence on structure control.
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