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中文摘要：
振动台试验中如何考虑无限地基辐射阻尼是结构动力试验中的一个难题。该文采用实时耦联动力试验（RTDHT）方法,在试验系统的数值子结构中引入地基集总参数模型,将地基的数值模型计算与结构的物理模型试验实时耦联,从而实现了考虑结构-地基动力相互作用（SSI）的结构振动台动力试验。利用该方法,对一个双层结构考虑结构-地基动力相互作用的动力反应问题进行了振动台试验,并对软土地基、硬土地基两种情况下双层结构的加速度反应、层间剪力等进行了分析比较,讨论了结构-地基动力相互作用对结构动力反应的影响。试验结果与远置边界有限元计算的数值精确解进行了对比,结果表明试验具有较高的精度,能够准确反映结构-地基动力相互作用对结构动力反应的影响。基于集总参数模型的实时耦联动力试验是解决振动台试验中无限地基辐射阻尼问题的一个可行的途径。
英文摘要：
The radiation damping of infinite foundation is difficult to treat in shaking-table tests.In this paper,a lumped parameter model of soil foundation is employed in the numerical substructure of real time dynamic hybrid testing（RTDHT）.By coupling foundation calculation and structure model testing,this method obtains the structural response of the whole system considering soil-structure interaction（SSI）.A two storey structure mounted on soil foundation has been tested on shaking table using RTDHT test method.The structural dynamic responses,including acceleration and shear force are obtained under soft soil and hard soil conditions.The RTDHT results are compared with results from the finite element method,demonstrating that RTDHT based on the lumped parameter soil foundation model can achieve satisfactory precision for experimental tests considering SSI effects.The effect of SSI on structural dynamic responses can be precisely obtained by RTDHT tests.
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