子结构隔震的巨型框架结构地震反应分析与振动台试验研究

Numerical analysis of seismic response and shaking table test of mega frame structure with isolated sub-structure

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 the isolated sub-structure for the mega frame structure,numerical simulation and shaking table test of the（ non-isolated） mega frame structure and the isolated mega frame structure with isolated sub-structure were performed. The prototype structure was introduced, then numerical analyses of the structures were carried out using finite element method,to study the seismic response control effect of the sub-structure isolation technique towards the main structure and the sub-structure. The model structure and its test scheme were introduced. Shaking table tests of the model structures were performed,the seismic responses of the main structure and the sub-structure were measured and analyzed. Analysis and test results indicate that the basic period of the mega frame structure with isolated sub-structure is prolonged. The first six modes of vibration of the mega frame structure with isolated sub-structure are mainly the sub-structure＇s vibration,while the first six modes of vibration of the non-isolated mega frame structure are mainly the main structure＇s vibration. With the sub-structure being isolated,the seismic responses of the main frame structure and the sub-structure are reduced evidently. The seismic responses and control effects of the lower second sub-structure are larger than the third sub-structure. Lateral deformations of the isolated sub-structures are concentrated on the isolation layers,but the displacement of the isolation layers are less than the width of the isolation joint.