木结构钢插板螺栓连接节点刚度及力-位移关系数学模型

Mechanical Model of Stiffness and Load-Displacement Relationship of Timber Bolted Connection with Slotted Steel Plate

摘要:

为研究木结构钢插板螺栓连接节点的力?位移关系，对24个顺纹试件进行了单调加载试验，考虑了螺栓直径、木材厚度以及两者比值的影响。试验结果表明，节点的变形能力较强，加载过程中经历了线性阶段、弹塑性阶段、塑性发展阶段和破坏阶段。基于曲线拟合，节点的力?位移关系可归纳为承载力、弹性刚度的两参数力学模型；通过理论分析，提出了节点承载力、弹性刚度的理论计算公式。最后，通过理论公式和力学模型，对钢插板螺栓连接节点的力?位移关系曲线进行了计算，理论计算曲线与试验曲线吻合较好。

Abstract:

In order to study the load-displacement relationship of the timber bolted connection with slotted steel plate， monotonic tests were performed on 24 specimens in the direction parallel to timber grain， considering the bolt diameter， the dowel bearing length and the slender ratio. The experimental results show that the connection undergoes the elastic stage， elastic-plastic stage， plastic-developing stage and failure， performing well in terms of deformation. Based on the curve fitting， a two-parameter （i.e.，strength and elastic stiffness） mechanical model was proposed and theoretical formulas of the two parameters were derived. Finally， with the theoretical formulas and mechanical model， a calculation was conducted to obtain the load-displacement relationship curves of the specimens， which was found to be in good agreement with the test results.