轻木结构正交主轴齿板连接承载力试验及分析

Experimental and Statistical Analysis on Load Carrying Capacity of Metal Plate with Orthogonal Oriented Teeth in Light Wood Frame Construction

为确定轻型木结构正交主轴金属齿板连接节点的受力—变形性能及板齿极限承载力、齿抗滑移承载力,对40个齿板节点试件进行了荷载平行于木纹方向的加载试验.在试验基础上,利用最小二乘原理对数据进行了Foschi公式的曲线拟合,得到该种齿板的荷载—变形曲线;利用概率统计方法对试验数据进行拟合检验,得出该种齿板承载力的概率分布模型,确定了该种齿板的板齿极限承载力标准值和齿抗滑移承载力标准值.分析结果表明,该类节点延性较好,变异性较低.

This paper presents an experimental study on mechanical properties of a new type of metal plate, in which its teeth are orthogonal oriented. Experiment was designed to investigate the load-deformation relationship, ultimate lateral capacity of teeth and ultimate lateral slip capacity of teeth for this type of metal plate connected joints. 40 specimens were tested under tension loading parallel-to-grain. Experimental data of load-deformation were fitted to Foschi model with the least-square method, the goodness of fit was verified by classic statistical method, and the Foschi model being adopted to represent the load-deformation relationship of wood-based connections had been widely accepted and extensively verified by experimental study. Then the probability distribution model for load carrying capacity was determined by goodness of fit test. Based on reliability theory, characteristic values for ultimate lateral resistance and ultimate lateral slip resistance were determined on the basis of the probability distribution model. Analytical results indicate that this kind of joints exhibit high ductility and low variability.