昆明新国际机场航站楼A区结构模型振动台试验研究  

Shaking table test of Terminal A structure of Kunming International Airport

作　　者：陆伟东[1] 刘伟庆[1] 吴晓飞[1] 束伟农[2] 王曙光[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京210009 [2]北京市建筑设计研究院,北京100045

出　　处：《建筑结构学报》2011年第6期27-33,共7页Journal of Building Structures

基　　金：云南省科技计划项目(2008CA007)

摘　　要：通过对昆明新国际机场航站楼A区结构1/60模型进行地震模拟振动台试验,分析了结构形式复杂的大跨度基础隔震结构模型的设计方法,分别测试了隔震结构模型和非隔震结构模型的动力特性、阻尼比及其在不同地震动输入时结构的加速度、位移、扭转等动力反应,以及大跨度网架的竖向振动等,研究了结构破坏机理和破坏模式。试验结果表明:基础隔震能够有效延长结构的自振周期、增加结构的阻尼比、提高结构的耗能能力;通过基础隔震,可以将水平地震输入加速度峰值降低到原来的40%,对竖向加速度没有降低作用,但通过对水平加速度的降低有效抑制了大跨度网架的竖向振动;烈度8.2度地震作用下隔震结构的位移、加速度、扭转等反应均比7.5度地震作用下非隔震结构的反应要小,且隔震结构在8.2度多遇和罕遇地震作用下结构的层间最大位移角分别为1/636、1/201。试验表明原型结构设计基本合理,采用基础隔震能够有效提高结构的抗震性能,隔震层以上结构在8.2度抗震设防烈度时的水平地震作用小于非隔震结构在7.5度抗震设防烈度时的对应值。最后针对试验及分析结果对原型结构设计提出一些改进建议。Based on the shaking table test of a 1/60 scale structural model of the Terminal A structure of the Kunming International Airport,the design method for complex isolated structure with large span is investigated.The dynamic characteristics and damping ratio,the acceleration,displacement and torsion responses under different seismic intensities,and the vertical vibration of the large cross-grid,etc.,of the isolated and non-isolated structure models were examined.The failure mechanism and failure modes of the structure were studied.The results show that the base isolated structure could prolong the structural vibration periods efficiently and increase the damping ratio.The energy dissipation of the structure can be improved as well.Moreover,the result also shows that the peak acceleration of horizontal seismic input could be reduced to be 40% of the original values,which can effectively reduce the vertical vibration of the large cross-grid.But the vertical acceleration is not reduced at all.Furthermore,the acceleration,displacement and torsion responses of the structure under 8.2 degree of seismic intensity are less than those under 7.5 degree of seismic intensity.The maximum inter-story drift ratio of the isolated structure under 8.2 degree frequently occurred earthquake and rarely occurred earthquake are 1/636 and 1/201,indicating the design of the prototype structure is basically reasonable.The isolation can improve the seismic performance effectively.The horizontal earthquake action of the structure above isolation layer in 8.2 degree of seismic intensity are les than the corresponding value of the non-isolated structure in 7.5 degree of seismic intensity.Finally,some suggestions are put forward according to the test and analysis results.

关 键 词：大跨度结构 隔震 缩尺模型 振动台试验 动力反应 

分 类 号：TU398[建筑科学—结构工程] TU317.1