摘要
通过对单铺作、两铺作、四铺作模型的低周反复荷载试验,研究了枓栱侧向刚度的退化规律。试验得出了单铺作、两铺作、四铺作的力-位移滞回曲线及骨架曲线。通过试验可以看出铺作层的变形是以水平滑移为主。摩擦滑移具有耗能、隔振作用,这也是古建筑木结构有着良好的抗震性能的重要因素。试验模型的滞回曲线呈平行四边形,滞回面积饱满。这说明铺作层具有良好的滞回耗能特性。铺作层的力学模型属于线性强化弹塑性模型。根据试验得出的恢复力模型反应了铺作层的恢复力特性及刚度变化规律,适应于同类木结构的静力传递和结构动力分析计算研究。
Through low cyclic loadings of single Dougong,two Dougongs and four Dougongs,the degradation of the lateral stiffness of Dougong was studied.According to the test,the hysteresis curve and skeleton curve of force-displacement were obtained and the formula of resilience model and mechanical model were established.From the experiment,it is by all appearances that slippage is the main deformation of Dougong.Energy dissipation due to frictional slippage is an important reason for the excellent seismic behavior of ancient wooden structures.Hysteretic loops of Dougong give the appearance of parallelogram.Plump area of the hysteretic loop accounts for its excellent ability of energy dissipation performance.The mechanics model of Dougong belongs to linear strengthening elastic-plastic model.Both the fitting equation of force-displacement and resilience model reflect the changes in the stiffness of Dougong,and can be used to the research on static load delivery as well as dynamic structural analysis and calculation of similar wooden structures.
出处
《工程力学》
EI
CSCD
北大核心
2010年第3期74-78,共5页
Engineering Mechanics
基金
国家自然科学基金项目(59878043)
陕西省重点试验室建设项目(05JS17)
关键词
中国古建筑
木结构
枓栱
抗震
刚度
Chinese historic buildings
timber structure
Dougong
aseismic
stiffness
