【摘要】 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。更多还原

【Abstract】 This paper proposes a simplified method conducting earthquake simulation test on shaking table for high-rise tower structure with consideration of soil-structure interaction to overcome the limitation of the load-bearing capacity,the size of the shaking table and the difficulty in simulating both of the soil foundation and its’ boundary condition in experimental practice.An off-shore high-rise tower structure was taken as the example for developing the proposed simplified method.A 3-D finite element analysis model(Model A) considering the soil-structure interaction and a simplified model(Model B) were built.Both models are equipped with the same upper structure.According to results of numerical modal analyses,response spectrum analyses,and time-history analyses,the form of foundation structure was adjuset repeatedly so that the seismic responses of superstructure of both Model A and Model B are same.Model B is precisely the simplified model considering soil-structure interaction which could be used for shaking table test.更多还原