【摘要】 基于一55层巨型框架结构振动台试验模型,给出了相似关系、模型周期、试验测点布置及试验加载制度,利用试验采集的数据,应用峰值法得到不同水准地震作用下试验模型的自振频率和振型.分析结果表明,随着地震动峰值的提高,结构自振频率明显下降,刚度降低,结构处于塑性工作状态;在弹性阶段的1阶振型呈弯剪型,在塑性阶段结构变形剪切型特征愈发明显.更多还原

【Abstract】 Based on the shaking table test for a 55-storey mega frame structure,similarity relation,model period,arrangement of measuring points,and loading system for the test model are presented.Natural frequencies and vibration modes of the test model under different ground motion are obtained by using the peak method with the test data.The analysis results show that the structural frequencies and stiffness reduce with the increase of the peak of ground motion.The first order mode shape is shear-flexural type in the elastic stage,and shear characteristics is apparent in the plastic stage.更多还原