基础隔震和非隔震结构模型振动台试验对比研究

Research on shaking table test of base isolated and ordinary structure

昆明新国际机场航站楼(A区)结构为目前世界最大单体隔震结构。建立了该建筑1/60缩尺模型,完成了隔震结构模型和非隔震结构模型的振动台对比试验。研究了隔震结构模型和非隔震结构模型的动力特性,以及隔震结构在8.2度多遇、基本、罕遇地震烈度作用下和非隔震结构在7.5度多遇、基本、罕遇地震烈度作用下结构的加速度和位移反应,以及基础隔震对结构顶部大跨网架竖向振动的影响。研究结果表明,基础隔震能够延长结构自振周期,增加结构阻尼比,有效降低隔震层上部结构的地震反应,同时能够有效降低大跨网架结构的竖向振动;发现该建筑进行基础隔震后按照7.5度设防烈度设计能够满足8.2度设防烈度要求,且满足小震不坏、中震可修、大震不倒的抗震设防要求。

Now Kunming New International Airport Terminal（A area） is the biggest single base isolated structure in the world.The scale model of 1∶60 was set,and the shaking table test about the comparison on the isolated and the non-isolated structure model was completed.The dynamic characteristics between the isolated and non-isolated model were researched.The action of the acceleration and the displacement of the isolated structure under frequently-occur earthquake,basic earthquake,rare earthquake as well as the non-isolated structure under these three levels of earthquake was obtained.Meanwhile the effect of base isolation on vertical vibration of the large-span grid was also studied.The results show that the base isolated structure can extend the natural period of the structure,increase the structural damping ratio,and reduce the seismic response of the structure above isolation layer effectively,as well as reduce the vertical vibration of the large-span grid structure.The building for the base isolation design in the accordance with 7.5 degrees fortification intensity can meet 8.2 security requirements,and meet the requirements for the seismic resistance of ＂no damage under minor earthquake,repairable under moderate earthquake and no destruction under large earthquake＂.