不同类型连梁框架-核心筒结构抗震性能研究

A study on seismic behaviour of a frame-core tube structure with different types of coupling beams

为了研究不同类型连梁对结构抗震性能的影响,利用结构性能评价软件PERFORM-3D对两个设置不同类型连梁的钢筋混凝土框架-核心筒结构进行模态分析、反应谱分析和不同水准地震作用下的动力时程分析。以结构的动力特性、力和位移响应、罕遇地震下结构弹塑性耗能组成和损伤等指标作为性能评估参数,对比分析了不同类型连梁对框架-核心筒结构抗震性能的影响。研究结果表明,不同类型连梁耗能能力相差较大,对框架-核心筒结构的抗震性能有较大影响,设置了弯曲型连梁的框架-核心筒结构在罕遇地震下的塑性耗能主要由连梁提供,核心筒本身具有二道抗震防线,其整体抗震性能优于设置剪切型连梁的结构。

The influence of diffe re nt types of cou pl ing beams on seismic performance of a frame-core tube structure was studied by modal analysis, response spectrum analysis and t ime-h istory analysis o f two RC frame-core tube structures with different types of coupl ing beams under diffe re nt levels o f earthquake ground motions with the aid of the structural analysis software PERFORM-3D . The effects of the type of cou pl ing beams on the seismic performance of the structure were analyzed by comparing the performance parameters such as the structural dynamic charac ter is tic s, displacement, and force responses of the structure, the dissipated energy and the structural damage of the structure under rare earthquake. The study indicates that the energy-dissipation capacity of dif fe re nt types o f coupl ing beams is considerably different, and the type of coupl ing beams has s ig nif ica nt effect on the overal l seismic performance o f the s tructure. The input seismic energy is mostly dissipated by the f lexure-dominant cou pl ing beams so that the core tube itself has dual seismic defense lines. The seismic performance of the structure with the f lexu re-d omin at in g coupl ing beams is bet ter than that of the structure with shear-dominating cou pl ing beams.