【摘要】 为保护古建筑,采用低周反复加载试验方法,基于故宫太和殿某开间梁柱尺寸,制作了1∶8的缩尺比例的4梁4柱模型,考虑榫卯节点形式为燕尾榫,进行了低周反复加载试验,研究了古建筑榫卯节点的抗震性能。通过试验,获得了榫卯节点的M-θ滞回曲线,分析了节点的骨架曲线、耗能能力、刚度退化及延性性能,归纳了节点恢复力拟合曲线计算公式。结果表明,古建筑榫卯节点的M-θ滞回曲线以Z形为主,具有明显的捏拢特性;随着节点转角增大,其骨架曲线趋于平缓,体现了良好延性;节点承载力较小,耗能能力及刚度随着转角增大而降低。更多还原

【Abstract】 To protect Chinese ancient building,aseismic behaviors of Chinese ancient tenon-mortise joint are studied.Based on actual sizes of some part of Tai-He Palace in the Forbidden City,wooden frame models with a scale of 1:8 of the prototype structure are built considering Yan-wei type of tenon-mortise connections.By low cyclic reversed loading tests,M-θhysteretic curves as well as skeleton curves of the joints are obtained;the energy dissipation capability,stiffiness degradation and deformation performance are analyzed,then restoring force model is also studied.Results show thatM-θhysteretic curves of tenon-mortise joint are mainly of Z shape with obvious rheostriction property.With the increase of joint rotation angle,its skeleton curve tends to be flat which reflects its good ductility performance;however its energy dissipation capability and stiffiness decrease,and the tenon-mortise joint has low bearing capability.更多还原