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本文采用模拟地震振动台试验方法对局域大空间复杂体型高层结构的动力特性、地震反应规律和开裂破坏模式等进行了系统研究,重点分析了地震作用下结构的扭转振动反应及其空间分布规律。研究结果表明:局域大空间对结构的动力学特性具有显著的影响,扭转振型可能成为结构一阶振型;在地震作用下,结构动力反应较大,且具有明显的局域及整体扭转振动,结构局域大空间部位的局部扭转反应可能大于结构顶部的总体扭转反应,易造成大空间部位主要抗侧构件发生扭转破坏。对于此类复杂体型结构,必须采取有效措施增加结构局域大空间部位的抗侧抗扭刚度,以确保结构满足抗震设防要求。
In this paper, the dynamic characteristics, seismic response laws and cracking failure modes of the complex large-scale structures in large-scale local area are systematically studied with the method of simulated seismic shaking table test. The torsional vibration responses and the spatial distribution of the structure under earthquake are analyzed emphatically . The results show that the large local space has a significant influence on the dynamic characteristics of the structure, and the torsional vibration mode may become the first-order mode of structure. Under the action of earthquake, the dynamic response of the structure is large with obvious local and overall torsional The local torsional response of the large space in the vibration and structural area may be larger than the overall torsional response at the top of the structure and easily lead to the torsional destruction of the main anti-side members in the large space. For such complex body structure, effective measures must be taken to increase the lateral torsional stiffness of the large space in the structural area to ensure that the structure meets the seismic fortification requirements.