Shear experiments on mortise and tenon joints with top and bottom notches in the beam end were conducted with the length of the tenon as a variable. In addition, material experiments were performed to investigate the structural performance of the fracture modes of the joint. The experimental results show that when the lower notch at the beam end experiences splitting, the shear forces were identical for different tenon lengths and did not decrease. In addition, the deformation performance of the joint up to yielding was largely due to the compressive deformation perpendicular to the grain of the wood on the sides of the tenon. Based on the theory of the calculation method of the splitting strength of a notched beam, a formula for the splitting strength when the end of the beam is moment-resisting was proposed. It was confirmed that the proposed formula could estimate the shear force that caused the splitting fracture of the lower notch. In addition, the increase in shear force after the lower notch experienced splitting fracture was due to the increase in clamping force of the beam end due to rotational deformation.

中文翻译：

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梁端有上下缺口的榫卯节点抗剪性能验证

以榫头长度为变量，对梁端有上下缺口的榫卯节点进行剪切试验。此外，还进行了材料实验以研究接头断裂模式的结构性能。实验结果表明，当梁端下槽口发生劈裂时，不同榫头长度的剪力相同，且没有减小。此外，接头直至屈服的变形性能主要是由于榫头侧面垂直于木材纹理的压缩变形。基于缺口梁劈裂强度计算方法的理论，提出了梁端部抗弯时劈裂强度的计算公式。证实了所提出的公式可以估计导致下缺口劈裂断裂的剪切力。此外，下部缺口发生劈裂后剪切力的增加是由于梁端的夹紧力因旋转变形而增加。