马口铁加固古建筑榫卯节点抗震试验

为保护古建筑,采用试验方法,研究了马口铁加固古建筑榫卯节点后对节点抗震性能的影响.基于故宫太和殿三次间结构原型,制作了1:8缩尺比例的木结构空间框架模型,并考虑梁柱连接为燕尾榫形式,进行了低周反复加载试验,其中未加固构架和马口铁加固构架试验各做了3组.基于试验相关数据,获得了节点的弯矩-转角滞回曲线和骨架曲线,并对比分析了节点加固前后的耗能能力,刚度退化和延性等抗震指标.结果表明:马口铁加固榫卯节点后,虽然节点耗能能力略有下降,但节点拔榫量减小,抗弯承载力提高,刚度退化不明显,且节点仍具有较好的变形能力.因此,马口铁具有较好的加固效果.

Experiments on the aseismic behavior of Chinese ancient architecture mortise and tenon joints strengthened with iron hooks

To protect Chinese ancient architecture, the aseismic behavior of ancient Chinese architecture having ion hook strengthened mortise and tenon joints was studied experimentally. Based on the three frame structure of Tai He Palace in the Forbidden City, three wooden frame models were made on a 1/8 scale. The models were built using Yan wei (swallow tail) type of mortise and tenon connections. Low cycle reversed loading tests were used to get moment rotation hysteretic curves and skeleton curves for the joints. The energy dissipation capability, stiffness degradation and deformation performance were also studied. The results showed that after the joint was strengthened with an iron hook, although the energy dissipation capability of the joint decreased slightly, the chance that the embedded tenon pulled out of mortise also decreased, the stiffness and strength of the joint was enhanced, stiffness degradation of the joint was not obvious, and the joint had good ductility. Thus, iron-hook is good for strengthening mortise and tenon joints in Chinese ancient architecture.