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对透榫节点进行单调加载试验,获得其弯矩-转角关系曲线以及破坏形态,并运用有限元软件ABAQUS对榫头的变形状态和应力分布进行数值模拟.结合试验研究和数值模拟,建立了节点弯矩-转角关系的简化力学模型.研究结果表明:透榫节点正、反向加载时的破坏形态分别为榫头变截面处顺纹撕裂破坏和榫头下侧的受弯破坏;节点正向加载时的受弯承载力和极限转角小于反向加载时的受弯承载力和极限转角;节点的抵抗力矩主要由小出部位与卯口之间的相互作用来提供;榫头上侧缝隙对节点的初始滑移段影响显著;节点正、反向加载时的弯矩-转角关系均可简化为三折线模型.
The monotonous loading test of the mortise and tenon joints was carried out to obtain the curve of moment-rotation angle and the failure mode, and the finite element software ABAQUS was used to simulate the deformation state and stress distribution of tenon joints. Combined with experimental research and numerical simulation, Moment-angle relationship.The results show that the failure modes of the through-tenon joint in normal and reverse loading are the rupture of the rupture along the grain tenon and the bending damage of the underside of the tenon, respectively. When the node is loaded in the forward direction The flexural capacity and the limit rotation angle are less than the flexural bearing capacity and the limit rotation angle in the reverse loading; the resistance moment of the joint is mainly provided by the interaction between the small part and the mouth; The influence of slip section is significant. The bending moment-rotation relation of nodes in positive and negative loading can be simplified to the tri-fold model.