明销透榫节点抗弯性能研究

Research on flexural behavior of tenon joint with penetrating pin

为研究我国西南地区民族木结构中的主要榫卯节点——明销透榫节点的抗弯性能及其影响因数,设计了两个足尺节点进行单调加载试验,获得了其弯矩-转角关系曲线以及失效形态,并运用ABAQUS软件对影响节点抗弯能力的因数进行数值模拟分析。研究结果表明,明销透榫节点的失效主要是由于榫头顺纹受压变形与卯口横纹受压撕裂破坏,柱与枋本身较为完好;穿销透榫节点表现出更好的抗拔榫性能;明销透榫节点的抗弯能力的强弱主要取决于枋的横纹受压变形能力的强弱;摩擦系数和榫头高度的增加均可以显著提升节点屈服弯矩,同时榫头高度的增加使得节点的最大弯矩有较大幅度提升。

In order to study the bending performance and its influence factors of the tenon joint with penetrating pin,which are the main mortise and tenon joints of ethnic wood structures in Southwest China,two full-scale nodes were designed for monotone loading tests,and the moment-rotation curves and failure mode were obtained.The finite element software ABAQUS was used to simulate the factors that affect the bending capacity of the joints.The research results show that the failure of tenon and mortise joint with penetrating pin of the transverse groove of the socket is mainly due to the grain compression deformation of the tenon and the cross-grain compression tear failure,and the column and crossbeam are in good condition.The tenon joints with penetrating pin show better resistance to tenon performance.The strength of flexural behavior of the tenon joints with penetrating pin mainly depends on the strength of the cross-grain compression deformation ability of the crossbeam.The increase of the friction coefficient and the tenon height can significantly increase the yield moment of the joint,and the increase of the tenon height can greatly increase the maximum moment of the joint.