宋式木构架模型动力特性试验研究

摘要

宋代八架椽分心斗殿堂是一类重要的古建筑大木作,其柱架的连接方式为倒梯形燕尾榫卯连接,这种结构在中国各个历史时期广泛应用,现在则作为古建筑文物受到专门保护.以宋代八架椽分心斗殿堂为原型结构,根据相似原理,制作了3榀相似比为1∶4的木构架模型,测试了木材的材料性质和木构架模型在空载、半载和满载3种工况下的动力参数,根据幅频峰值法和实频-虚频峰值法得到了宋式木构架模型的1阶频率和阻尼比.研究宋代八架椽分心斗殿堂结构在动力作用下的力学行为以及地震作用下古建筑木结构的抗震能力有一定的实际意义.%The royal style palace with eight rafters built during the Chinese Song Dynasty is one of the popular types of Chinese traditional timber structures.Its beams are connected to columns using the inverted-trapezoid sectioned dovetail mortise-tenon joint,and the structure had been widely used during the ancient China.And in the contemporary era,the structure is preserved as ancient legacy.Based on the prototype of the royal style palace,three 1 ∶ 4 scaled specimens were fabricated,and the dynamic parameters of the specimens were tested under three working conditions (the zero load,the half design load and the design load).The material features of the timber members were measured,and the first-order model frequency and damping ratio of timber specimens were obtained by the amplitude-frequency method and real-frequency and imaginary-frequency method.It is practically useful to research the mechanical behavior of the royal style palace under dynamic loads and to estimate the seismic capability of the ancient timber structure after earthquake attacks.