【摘要】 在地下结构的振动台试验中,模型箱的设计是影响试验精度的一个很重要方面,本文的试验中采用了层状剪切砂箱,以最大限度地减小模型箱边界效应。而如何在数值计算中对层状剪切砂箱进行模拟成为数值分析要解决的关键问题。本文就是以此为背景展开了探讨,提出用变刚度的方法来近似模拟层状剪切砂箱,通过数值模拟结果与试验结果的对比发现,效果较好。在自由场计算的基础上,对综合管廊结构的振动台试验进行了数值模拟,计算结果与试验结果对比较好,说明本文建模计算方法是正确的,为后续的研究提供了基础。更多还原

【Abstract】 In the shaking table test of underground structures,the design of the model box is a very important aspect to affect the accuracy of the test results.Laminar shear box was adopted in our test to reduce the effect of the boundary of the box.This paper discusses the finite element simulation method of laminar shear box.The varying stiffness model to simulate the laminar shear box was put forward.The feasibility and efficiency of the proposed FEM model was validated by comparing the predicted responses with experimental measurements in terms of time history and the Fourier amplitude spectrum.Based on the free field simulation,the shaking table test with structure was analyzed with FEM.The results of the analysis and the test agree well,which indicate the numerical model is adoptable and provide a basis for the subsequent research.更多还原