以中国西南地区穿斗式古建筑木结构中常见的直榫节点为研究对象,对其在低周往复荷载作用下的受力机理进行了详细分析,建立了考虑节点拔榫量影响的M-θ力学模型和相应的实现算法,并给出了简化计算公式,最后采用试验数据对该力学模型进行了验证。结果表明,直榫节点的M-θ力学模型的计算结果与试验曲线吻合良好,可为中国古建筑木结构的抗震性能及加固的研究提供理论基础。 Taking the common mortise and tenon joints in the ancient Chinese-style ancient buildings in southwestern China as the research object, the mechanics of the mortise-tenon joint under the low cyclic reciprocating load was analyzed in detail, and the M- θ mechanical model and the corresponding realization algorithm, and the simplified calculation formula is given. Finally, the mechanical model is verified by the experimental data. The results show that the calculated results of the M-θ mechanical model of the straight joint are in good agreement with the experimental curves and provide a theoretical basis for the study on the seismic behavior and reinforcement of ancient Chinese wooden structures.