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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。
How to consider infinite foundation radiation damping in shaker test is a difficult problem in structural dynamic test. In this paper, the method of real-time coupled dynamic test (RTDHT) is used to introduce the ground-based lumped parameter model into the numerical substructure of the test system, and the numerical model calculation of the foundation is coupled with the physical model test of the structure in real time, Structural Shaking Table Dynamic Test of Foundation Dynamic Interaction (SSI). Using this method, a shaking table test is conducted on the dynamic response of a two-story structure considering the dynamic interaction of structure-foundation. The acceleration responses of two-story structure under two conditions of soft ground and hard ground, Etc. The effects of the structural-foundation dynamic interaction on the structural dynamic response are discussed. The experimental results are contrasted with the numerical exact solutions of the finite element analysis of the remote boundary. The results show that the experiment has high accuracy and accurately reflects the influence of the structural-foundation dynamic interaction on the structural dynamic response. Real-time coupling dynamic test based on lumped parameter model is a feasible approach to solve the infinite base radiation damping problem in shaker test.