广府古建筑木结构箍头榫节点 弯矩-转角关系理论分析

广府祠堂木结构节点多采用箍头榫形式，其受力性能与已有的直榫、燕尾榫等均存在差异，为研究箍头榫节点的受力性能，开展了箍头榫节点的受力机理分析，推导了弯矩-转角理论计算公式，并通过试验结果验证了理论计算公式的正确性；基于理论计算公式，对影响箍头榫节点弯矩-转角关系的各个因素进行分析.分析结果表明，在所计算的参数范围内，节点初始转动刚度和极限弯矩随着柱直径、榫宽度、摩擦系数、榫头侧面和卯口间挤压宽度的增大而增大，节点极限弯矩随着梁高增大而增大，而节点初始转动刚度受梁高的影响不大.所得结果可为广府地区古建筑木结构的受力分析及抗震性能研究提供理论依据.
Hoop head tenon-mortise joint is extensively adopted in an ancient timber structure in Guangfu, which is different from straight tenon-mortise joint or dovetail tenon-mortise joint in terms of mechanical performance. To analyze the mechanical properties of hoop head tenon-mortise joint，mechanism analysis was carried out and the moment-rotation calculation formulae were also derived, while the formulae were verified by experimental results. Using the formulae，the factors affecting the relationship of moment-rotation of hoop head tenon-mortise joint were investigated. The results indicate that within the range of parameters, the initial rotational stiffness and ultimate bending moment increase with the increase of the column diameter, mortise width, friction coefficient and unilateral compression width between tenon and mortise，while the ultimate bending moment increases with the increase of beam height, but the initial rotational stiffness is only slightly affected by the beam height. The results of this study can serve as a theoretical foundation for mechanical analysis as well as for seismic research of ancient timber structures in Guangfu.