超限高层建筑结构振动台试验模型设计的研究

STUDY OF MODEL DESIGN OF HIGH-RISE STRUCTURE BEYOND THE CODE-SPECIFICATION IN SHAKING TABLE TEST

针对超限高层建筑高度高、层数多、整体结构复杂等特点,依据一致相似率对一超限高层建筑进行振动台试验模型设计。通过计算探讨超限高层建筑结构模型分别采用人工质量模型、忽略重力模型、欠人工质量模型三种方式的合理性。研究结果表明:欠人工质量模型的设计是合理可行的,可以通过附加人工质量来调整加速度相似比至合理水平,以利于振动台试验的实施。通过合理的配重模型设计,可以减小重力失真效应造成的不利影响,从而使振动台试验更加准确地反映原型结构在地震作用下的动力响应和动力特性。

The uniform similitude law was applied to design the model of high-rise buildings beyond the code- specification in shaking table test in consideration of transfinite height, multiple layers, overall complexity and other characteristics of the structure. Three kinds of weight models were used in design calculation to discuss the rationality, namely, the model with artificial masses, the model neglecting gravity forces and the model without enough artificial masses. The results showed that out of these three models, the model without enough artificial masses was feasible, and the similar ratio of acceleration was controlled within reasonable range by adjusting the artificial masses in order to facilitate the implementation Of the shaking table test. The model without enough artificial masses could reduce the adverse impact of the gravity distortion effect, therefore the dynamic response and dynamic characteristics of the prototype structure in the earthquake could be reflected accurately in shaking table test.