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针对振动台试验中无限地基难以模拟和数值分析中流-固耦合作用难以计算两个难题,将最近发展的实时耦联动力试验方法引入土-结构-流体动力相互作用问题的研究。以一个渡槽结构为例,其中渡槽-水体作为物理子结构,采用振动台进行物理试验,而无限地基作为数值子结构,采用集总参数模型进行数值模拟。两个子结构之间实时交换数据,联合评估整个耦合体系的动力响应。试验结果和有限元数值模拟结果吻合良好,表明该试验方法具有较高精度。对不同特性地基土进行的试验对比分析结果表明:对于软土地基,考虑土-结构相互作用(SSI)的结构反应幅值明显减小,周期延长;随着地基土变硬,SSI效应逐渐变弱,结构反应最终收敛至刚性地基解。
In view of the difficulty of simulating infinite foundation in shaking table test and the difficulty of calculating fluid-solid interaction in numerical analysis, two problems are solved. The recent development of real-time coupled dynamic test is introduced into the study of soil-structure-fluid dynamic interaction. Take an aqueduct structure as an example, the aqueduct - water body is taken as a physical substructure, and the shaking table is used for physical experiments. The infinite foundation is used as numerical substructure, and the lumped parameter model is used for numerical simulation. Real-time exchange of data between two substructures to jointly evaluate the dynamic response of the entire coupling system. The experimental results are in good agreement with the numerical simulation results of the finite element method, indicating that the test method has high accuracy. The results of comparative tests on different soil properties show that for soft ground, the amplitude of structural response considering soil-structure interaction (SSI) decreases obviously and the period increases. With the hardening of foundation soil, the SSI effect gradually changes Weak, structural response eventually converges to rigid foundation solution.