碳纤维布加固透榫木构架抗震性能试验

Seismic performance of through-tenon joint strengthened with carbon fiber reinforced polymer in wood structure

榫卯节点在地震中极易损坏,加固榫卯节点成为加固木结构建筑的关键。通过对3榀按照《中国古建筑木作营造技术》制作的透榫木构架,分别采用3种不同碳纤维(CFRP)布加固方案加固的构架进行水平低周反复加载试验,得到未加固构架和3种不同加固构架的破坏模式、拔榫量、P-Δ滞回曲线、骨架曲线、刚度退化及耗能能力等。通过试验研究表明:经CFRP布加固后,3种不同加固构架的CFRP布破坏程度不一样;拔榫值在加载后期较未加固构架明显减小;加固构架的承载力与刚度提高,其中双层分离式CFRP布加固提高的最多;节点的耗能能力稍有降低。3种CFRP布加固方法均取得了较好的加固效果,双层分离式加固效果最优。

The strengthen of mortise-tenon joints was the key to strengthen wood structure because they were extremely easy to be destroyed under earthquakes.Low-cyclic reversed loading tests were conducted on six wood frame models,including three non-reinforced models made with Chinese ancient wood construction technology,and three models strengthened with carbon fiber reinforced polymer （CFRP） by different construction methods.Their behaviors,such as failure characteristics,node pull tenon size,P-Δ hysteretic curves,skeleton curves,energy dissipation capacity,and degradation of stiffness,were analyzed.Experimental results indicated that each of the three different CFRP reinforced models appeared different failure degrees.The node pull tenon values of the models strengthened with CFRP reducd obviously than the normal structure during the late loading period ; and the bearing capacity and the stiffness of reinforced models improved,in which double CFRP reinforced models improved obviously.While the energy dissipation capacity had a little decrease;All these three strengthening methods,especially the method for double CFRP strengthening method,were obviously effective.