To study the force–displacement relations of bolted timber joints with slotted-in steel plates, we performed a monotonic loading test parallel to the grain on 24 specimens. The influences of the bolt diameter, timber thickness, and their ratio were considered. As shown by the test results, the joints had a high deformation capacity and experienced a linear stage, a stiffness degradation stage, a yield plateau stage, and a failure stage during loading. Based on the curve fitting and parameter identification, the force–displacement relations of the joints were summarized in a mechanical model with two parameters, i.e., the bearing capacity and the elastic stiffness. Based on theoretical analysis, we proposed a theoretical calculation formula for the bearing capacity and elastic stiffness of the joints. Finally, we calculated the force–displacement relation curves of bolted timber joints with slotted-in steel plates using the mechanical model and the theoretical formula. The calculated curves fitted well with the experimental curves.

中文翻译：

---

带有平行于木纹的开槽钢板的螺栓连接的木材关节的力-位移关系

为了研究带有开槽钢板的螺栓连接的木节的力-位移关系，我们在24个样本上进行了平行于谷物的单调加载试验。考虑了螺栓直径，木材厚度及其比例的影响。如测试结果所示，接头在加载过程中具有较高的变形能力，并经历了线性阶段，刚度退化阶段，屈服平稳阶段和破坏阶段。基于曲线拟合和参数识别，在具有两个参数的力学模型中总结了关节的力-位移关系，即承载力和弹性刚度。在理论分析的基础上，提出了节点承载力和弹性刚度的理论计算公式。最后，我们使用力学模型和理论公式计算了开槽钢板螺栓连接的木节的力-位移关系曲线。计算曲线与实验曲线吻合得很好。