考虑三维地震动作用下振动台试验隔震层简化

基于等效原则、相似理论,考虑三维地震动作用下振动台试验中原型结构隔震层的简化,并对模型结构隔震层进行系统研究。针对不同高宽比隔震结构,提出完全等效简化方法和部分等效简化方法,包括隔震垫等效、模型支座参数及坐标确定、相似关系确定等。利用不同高宽比隔震结构振动台试验,结合有限元数值模拟,进行方法验证。理论推导与数值模拟证明简化方法具有良好的准确性,且在误差允许范围内,简化后的隔震层所获得的加速度、速度、位移等动力特性与简化前相同,可以用于振动台试验模型设计。

Simplified method of isolation layer in shaking table test considered three-dimensional seismic effect

The method of that isolation layer of prototype structure simplified to model structure in shaking table test was systematically researched based on equivalent principle, similarity theory, and considered three-dimensional seismic effect. Aimed at isolated structure in different aspect ratio, complete equivalent and part of equivalent simplified method were proposed. Equivalent of isolation layer, model''s parameters of isolation bearings, coordinate certainty, similarity theory and so on were included in the method. the method was verified with shaking table tests of isolated structure with different aspect ratio, and combined with finite element numerical simulation, Theoretical derivation and numerical simulation were certified that the simplified method possessed well accuracy. And within the error allowed, the same dynamic characteristics of acceleration, velocity, displacement of isolation layer before simplification could be obtained. Therefore, the method could be used in shaking table test of model design.