中文摘要：

现存古建筑木结构中均存在不同程度的残损，榫卯节点的松动属于其中典型的一种．为研究不同程度的节点松动对透榫节点的抗震性能影响，参照清《工程做法则例》以1：3．2缩尺比，制作了6个透榫节点模型，其中1个完好节点和5个不同松动程度节点．通过低周往复加载试验，得到了完好节点与不同松动程度节点的破坏形态、弯矩一转角滞回曲线与骨架曲线、强度与刚度退化曲线、变形及耗能能力等力学性能．结果表明：透榫节点榫颈截面处木材纤维拉断，出现裂缝并斜向榫头端部延伸，发生弯曲破坏；各节点滞回曲线形状均由S形过渡到Z形，且随着松动程度增大，捏拢效应越明显；松动节点的转动弯矩、刚度和耗能能力均比完好节点低，且随着松动程度增大不断降低；各个节点的变形能力均较好，但松动节点的极限转角要大于完好节点，并随节点松动程度的增大而增大．

英文摘要：

Different degrees of damage exist in ancient wooden building, in which the looseness of mortise-tenon joints is typical. In order to study the influence of looseness with different degrees on the seismic performance of penetrated mortise-tenon joints, six 1：3.2 scale penetrated mortise-tenon joints models that are made complying with Engineering Fabrication Methods of Qing Dynasty were tested under low-cycle reversed loading. One of these joints is complete,while the other 5 have defects of different degrees of looseness. The behaviors of joints such as the failure characteristics, hysteretic loops and skeleton curve, degradation of rigidity and energy dissipation capacity were studied. The results indicate that the wood fiber at the bottom of the tenon is snapped and the crack extends to the other end. The shape of hysteretic loops of all joints transfers from S shape to Z shape and the gathering effect becomes more obvious with the increase of loose degree. The rotation capacity, stiffness and energy dissipation capacity of the loose joints are lower than the intact one significantly and reduce gradually as the loose degree increases. Each joint exhibits good deformation performance. The ultimate rotation of the loose joints are higher than the intact one and increase gradually as the loose degree increases.