中国古建筑木结构模型的振动台试验研究

通过一殿堂木结构 1∶3 5 2模型的模拟地震振动台试验 ,研究了结构动力特性及地震反应的变化规律。将榫卯和斗拱的力学模型比拟为变刚度弹簧单元 ,进行了动力时程分析。结果表明 ,由于大震下柱底与础石的滑移和榫卯与斗拱的摩擦阻尼作用 ,大幅度减少了上部结构的地震响应。因此 ,中国古建筑木结构具有良好的耗能与减震性能 ,它所蕴涵的受力机理 ,对现代建筑也有一定的借鉴作用。

STUDY ON THE SEISMIC BEHAVIORS OF CHINESE ANCIENT WOODEN BUILDING BY SHAKING TABLE TEST

A model was made according to the actual Chinese ancient wooden palace with a scale of 1/3.52 of the prototype structure,on which the shaking table experiment was carried out.The dynamic characteristics and the change rules of frequency and damping ratio were tested,and the seismic responses of the model were also obtained.By simulating the state of mortise-tenon joint and Dougong with the unit of varied stiffness spring,time-history responses of the structure were analyzed.It is shown that the seismic responses of the roof are reduced significantly due to the slide between column footing and pier stone,as well as action of friction damping of Dougong and mortise-tenon joint under strong earthquake.Therefore,Chinese ancient wooden buildings exhibit good behaviors of energy dissipation and vibration reduction,the mechanical principles contained in those buildings can be very useful reference for modern buildings as well.