土-桩基-钢结构振动台试验数值模拟分析

Numerical simulation analysis of shakingtable test of soft soil-foundation-nuclear island plant

采用与商用有限元软件ANSYS对比验证后计算更为高效的土-结相互作用分区分析方法(PASSI,Partitioned Analysis of Soil-Structure Interaction),对土-桩基-钢结构模型的振动台试验进行了考虑土体材料非线性的数值模拟,对比分析了振动台试验结果与数值模拟结果,并进行了相应的分析与总结。输入三种调幅(0.05g, 0.10g以及0.20g)下的RG160,Chichi与Landers地震波,对比分析了振动台试验与数值模拟试验所得土体与结构加速度放大系数、桩身应变以及桩身弯矩,结果表明:该数值模拟方法定性上准确地反映了振动台试验中的试验结果,可为土-桩基-钢结构的抗震设计提供参考依据,但由于数值模拟中未考虑试验中存在的桩土接触非线性以及桩基破坏等问题,试验结果在定量上仍存在一定的差异。

In this paper,the method of Partitioned Analysis of Soil-Structure Interaction(PASSI),which is more efficient than the commercial finite element software ANSYS,is used to simulate the shaking table test of soil-pile-steel structure model considering the nonlinearity of soil material.The results of shaking table test and numerical simulation are compared and analyzed,and the corresponding analysis and summary are carried out.The RG160,Chichi and Landers seismic waves under three kinds of amplitude modulation(0.05g,0.10g and 0.20g)were input,and the acceleration amplification coefficients of soil and structure,pile strain and pile bending moment obtained by shaking table test and numerical simulation test were compared and analyzed.The results show that the numerical simulation method qualitatively and accurately reflects the test results in the shaking table test,which can provide reference for the seismic design of soil-pile foundation-steel structure.However,due to the lack of consideration of the problems of pile-soil contact nonlinearity and pile foundation failure in the test,there are still some differences in the test results quantitatively.