黏弹性阻尼器增强传统木结构燕尾榫节点试验研究

为研究村镇传统木结构燕尾榫节点在不同摩擦力工况下，以及节点安装阻尼器前后的耗能情况，采用杉木和松木共制作12个燕尾榫节点试件，通过改变榫卯节点侧面紧密程度来改变榫头与卯口间的摩擦力，同时提出了一种黏弹性阻尼器增强节点，将增强前后的节点进行低周反复加载对比试验。研究结果表明：木材种类和榫卯间摩擦力大小对节点的抗震性能有较大影响；燕尾榫节点滞回曲线捏缩效应明显，同级加载位移下承载力退化主要发生在第二循环，而刚度退化曲线表现出明显的不对称性，其负向加载时具有更好的抗震性能；在安装阻尼器后，节点的耗能能力、刚度和承载力有显著提高，且负向加载时提高更为显著。

Experimental study on dovetail mortise-tenon joints with viscoelastic dampers in traditional timber structures

In order to study the seismic behavior of dovetail mortise-tenon joints in traditional timber structures in rural areas under different friction conditions and whether to install dampers,12 dovetail joints specimens made of Chinese fir and pine were prepared,and the frictional forces between tenon and mortise were changed by changing the tightness of side of the dovetail joints. A new viscoelastic damper was also proposed to enhance the seismic behavior of the joint.The joints before and after reinforced by viscoelastic dampers were subjected to low-cycle reversed loading tests. The results show that the type of wood and different frictional forces between the tenon and mortise have a great influence on the seismic behavior of the mortise-tenon joint. The pinching of hysteresis curves of the dovetail joint is obvious,and the strength degradation under the same level of displacement mainly occurs in the second cycle. The rigidity degradation curve shows obvious asymmetry,and better seismic behavior is exhibited under negative loading. After the damper is installed,the energy consumption,rigidity and bearing capacity of mortise-tenon joint are significantly improved,especially under negative loading.