为了探究宋式传统摇摆木构架的结构受力特征,对1∶2宋式四柱四梁木构架缩尺模型进行了水平低周往复试验,基于滞回曲线、骨架曲线、刚度退化曲线的变化特征,采用滞回环屈服刚度、位移恢复系数和层间位移集中系数探究其恢复性。结果表明:各狭长S型带状滞回环具有相似性,其等效刚度退化显著;水平位移超过屈服位移后,滞回环屈服刚度趋于整体屈服刚度;位移恢复系数介于0.6~0.8之间,木构架具有良好的位移恢复能力;木构架的层间位移集中系数在1.08~1.65之间,水平变形集中在柱架层,柱架层是木构架恢复性的来源。研究成果是建立传统木构架理论分析模型的基础,可为现存古建筑木结构的现状评估以及加固修缮提供参考。

In order to explore the structural stress characteristics of rocking timber frame inSong Dynasty, the scale model of 1∶2 Song-style four-column four-beam wood frame was testedby horizontal low-cycle reciprocating test. On the basis of the change characteristics of hysteresiscurve, skeleton curve, and stiffness degradation curve, the yield stiffness of hysteresis loop,recoverycoefficient of displacement, and inter-story displacement concentration factor were used toexplore the recoverability of timber frame. The results show that the narrow S-shaped band hystereticloops are similar, and their equivalent stiffness values degrade significantly. When thehorizontal displacement exceeds the yield displacement, the yield stiffness of hysteresis loop approachesoverall yield stiffness; The displacement recovery coefficient is between 0.6 and 0.8,and the timber frame has good displacement recovery ability. The inter-story displacement concentrationcoefficient of the timber frame is between 1.08 and 1.65, and the horizontal deformationis concentrated in the column frame layer, which is the source of timber frame resilience.The research results are the basis of establishing the theoretical analysis model of traditional timberframe, and can provide reference for the current situation evaluation and reinforcement and repair of existing ancient wooden structures