大高宽比高层结构基础隔震应用与研究

Base-isolated Application and Research on Large Height-width Ratio High-rise Structures

目前隔震技术在多层建筑中应用越来越广泛,国内在高层结构中的应用范例不多。一方面由于隔震支座拉应力不易控制,另一方面高层结构的倾覆问题也对建筑高度和高宽比带来限制,本文首先对一栋大高宽比高层结构进行了隔震设计,并分析了隔震方案的可行性以及隔震效果。结果证明方案可行,隔震效果明显。探究了适用于高层结构的支座布置规律,为高层结构隔震设计积累了经验,并证明隔震技术在高层结构中的适用性。最后从能量角度,通过功率谱密度表征原地震时程和滤波时程的能量变化,分析可知滤波原理实际为能量过滤,进一步延伸了滤波原理并从新的角度认识了隔震层工作机理。

Nowadays, the isolation technology is widely used in multi-storey buildings, while the application of isolation technology on the high-rise structure is few. Due to the uncontrollable tensile stress of isolation bearing and the risk of structures overturning, the architectural structure aspect ratio is limited. In this paper, firstly, a base=isolated high-rise structure with large height-width ratio is designed and the feasibility of this isolation scheme and the isolation effect are analyzed. The results show that the isolation scheme is reliable and the isolation effect is obvious. Secondly, the suitable bearing arrangement rule for high-rise structures is explored, and the applicability of isolation technology used in high-rise structures is confirmed. Lastly, from energy point of view, the power spectral density characterization of original seismic time history and the energy changes of filtering schedule are studied. According to the analysis results, the filtering principle is actually energy filtering. In addition, the filtering principle is further extended and the mechanism of vibration isolation is comprehended from a new perspective.