马口铁加固古建筑抗震试验

采用试验方法,研究了马口铁加固古建筑榫卯节点后木构架的抗震性能.基于故宫太和殿三次间的相关尺寸,制作了1∶8的4梁4柱榫卯连接木结构空间框架模型,采用人工加载方式,进行了低周反复加载试验,获得了加固前后构架的力-侧移滞回曲线和骨架曲线,分析了加固前后的构架耗能能力、刚度退化规律及变形能力.结果表明,马口铁加固榫卯节点后,马口铁对榫卯节点的约束作用在一定程度上减小了节点拔榫量,提高了构架的侧移刚度及承载力;加固后的构架刚度退化不明显,变形能力较强,但是耗能能力减弱.

Aseismic Behavior of Chinese Ancient Wooden Structure Strengthened by Iron-hook

To protect Chinese ancient buildings,aseismic behaviors of wooden structure strengthened by iron-hook are studied through experiments.Based on actual sizes of the 3rd frame of Tai-He Palace in the Forbidden City,three wooden frame models with a scale of 1∶8 of the prototype structure were built considering tenon-mortise connections.Low cyclic reversed loading tests were carried out by manual loading means and means of load-displacement hysteretic curves and skeleton curves of the structures were obtained.By analyzing their energy dissipation capability,stiffiness degradation and deformation performance were studied.Results show that after the structure is being strengthened by iron-hooks and with their embedding effects,tenon pulled out of the mortise becomes less,stiffness and strength of the structure are enhanced,stiffness degradation of the structure is not obvious,and its deformation performance is still good,however its energy dissipation capability decreases.