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考虑到地震模拟振动台本身的承载能力限制、土体及边界条件模拟的复杂性、模型缩尺比例不能过小等因素,提出了一种在地震模拟振动台试验中简化考虑土-结构相互作用的方法,并以某海上高耸塔结构为例说明了该方法的可行性。利用有限元软件ETABS9.0.0建立了两个三维有限元模型:考虑土-结构相互作用模型(模型A)和简化模型(模型B)。其中,模型B上部结构与模型A相同,通过模态分析、反应谱分析和时程分析反复调整基础结构形式,使两个模型的上部结构地震反应相同。调整得到的模型B,即为考虑土-结构相互作用的简化模型,可为土-结构相互作用地震模拟振动台试验提供参考。
Considering the limitation of bearing capacity of seismic simulation shaking table itself, the complexity of simulation of soil and boundary conditions, and the scaling ratio of model can not be too small, a new method to simplify soil-structure interaction The method of towering tower was taken as an example to illustrate the feasibility of this method. Two three-dimensional finite element models were established using the finite element software ETABS 9.0.0: The soil-structure interaction model (model A) and the simplified model (model B) were considered. The upper structure of Model B is the same as that of Model A, and the basic structure forms are repeatedly adjusted through modal analysis, response spectrum analysis and time-history analysis so that the superstructure seismic responses of the two models are the same. The adjusted model B is a simplified model considering the soil-structure interaction and provides a reference for the shaking table test of soil-structure interaction.