江南地区抬梁木构建筑馒头榫节点受力性能研究

为研究江南地区抬梁式木构建筑馒头榫节点的受力性能，通过节点试验获取该种榫卯节点在低周反复荷载作用下的破坏模式、滞回曲线、骨架曲线、转角刚度。综合考虑馒头榫节点的接触非线性和木材的材料非线性，采用ANSYS非线性有限元方法对其受力性能进行理论分析。结果表明：该种榫卯节点的滞回曲线基本上都呈Z形，具有明显的捏拢特性。该种榫卯试件均经历了弹性阶段、屈服阶段和破坏阶段。此外，ANSYS有限元分析结果和试验结果较为吻合，通过分析，获取了馒头榫节点的平面内（竖向）转角刚度K1、平面外（水平）转角刚度K2和扭转刚度K3的相互关系，可近似归纳为12:1:2。研究结果可为江南地区抬梁式木构建筑的计算分析及保护修缮提供理论基础。

Research on Mechanical Properties of Mantou Mortise-tenon Joints in the Post-and-lintel Constructions of the Traditional Timber Buildings in the South Yangtze River Regions

In order to study the mechanical properties of the Mantou mortise-tenon joints in the post-and-lintel constructions of the ancient traditional timber buildings in the South Yangtze River Regions, the failure modes, the hysteretic curves, the skeleton curves, the rotation rigidities of the Mantou mortise-tenon joints under low cyclic loading were studied with the experimental method. Furthermore, with the consideration of the nonlinear contact influence of the mortise-tenon joint and the nonlinear stress-strain behavior of the timber material, the mechanical properties of the Mantou mortise-tenon joints were analyzed by ANSYS software. The results showed that the hysteretic curves of the Mantou mortise-tenon joints appear to be the Z shape and have the obvious pinch effects. During the process of the test, these mortise-tenon joints orderly pass through the elastic stage, the yield stage and the failure stage. The theoretical results agree well with the experimental results. The relationship of in-plane rotational rigidity K1, the out-of-plane rotational rigidity K2 and the tortional rigidity K3 of the Mantou mortise-tenon joint is achieved and the ratio of them is about 12:1:2. The results could provide the theoretical base for computing analysis and repair design of the traditional timber buildings in the South Yangtze River Regions.