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为考察基于子结构隔震的巨型框架结构的实际振动控制效果,对一巨型框架结构和采用子结构隔震的巨型框架结构进行数值分析和振动台试验。介绍了巨型框架结构原型,采用有限元方法对巨型框架结构和采用子结构隔震的巨型框架结构进行分析,研究子结构隔震技术对外部主框架和内部子框架的地震反应控制效果。介绍了缩尺模型结构及其试验方案,对其进行了模拟地震的振动台试验,测量和分析了主框架和子框架的地震反应。有限元分析和振动台试验结果表明:子框架隔震后,巨型框架结构的基本周期得到延长,但隔震结构前6阶振型的振动都是以子框架振动为主,而非隔震结构前6阶振型的振动都是以主框架的振动为主。子框架隔震后,主框架和子框架的地震反应都显著减小,位置较低的子框架2的地震反应及其隔震效果一般要比上部子框架3的大。隔震子框架的变形主要集中在隔震层上,但隔震层变形小于主、子框架间的隔震缝宽度。
In order to investigate the actual vibration control effect of mega-frame structure based on sub-structure isolation, numerical analysis and shaking table test of a mega-frame structure and mega-frame structure with sub-structure isolation were carried out. The prototype of mega-frame structure is introduced. The mega-frame structure and mega-frame structure with sub-structure isolation are analyzed by finite element method. The seismic response control effect of sub-structure seismic isolation technology on external main frame and internal sub-frame is studied. The structure of scale model and its test scheme are introduced. Shaking table tests of simulated earthquakes are carried out. The seismic responses of the main frame and the sub-frame are measured and analyzed. The results of finite element analysis and shaking table test show that the basic cycle of the mega frame structure is prolonged after the sub frame is isolated. However, the vibration of the first 6 modes of the isolated structure is based on the sub frame vibration rather than the isolated structure The vibration of the first 6 modes is dominated by the vibration of the main frame. After sub-frame isolation, the seismic responses of the main frame and the sub-frame are significantly reduced. The seismic response and the isolation effect of the sub-frame 2 with a lower position are generally larger than those of the upper sub-frame 3. The deformation of the isolator frame mainly concentrates on the isolation layer, but the deformation of the isolation layer is less than the width of the isolation slot between the main frame and the sub-frame.