木结构主次梁新型挂钩件连接节点的受力性能

Mechanical performance of a new hanger joint of secondary beam to primary beam in timber structures

摘要:

为研究新型木结构主次梁新型金属挂钩件连接节点的受力机理,参照ASTM针对挂钩件的测试标准,进行了8个模型的竖向加载静力试验,得到了节点承载力与主、次梁相对变形曲线和2种典型破坏模式.建立了新型挂钩件节点的ABAQUS三维实体有限元模型,与试验结果和试验现象对照,验证了有限元模型的准确性.采用该模型对挂钩件节点进行参数分析,研究了挂钩件翼缘厚度和宽度对节点抗剪极限承载力和刚度的影响.对挂钩件节点进行详细受力分析,提出了该新型挂钩件节点的简化受力模型,推导了节点的极限承载力计算公式和破坏模式的判别方法,与试验结果吻合良好.

Abstract:

To explore the mechanical behavior of a new type of steel hanger joint of secondary beam to primary beam in timber structures, static vertical loading tests of eight specimens using the new hanger joint are carried out based on the ASTM test standards. The load-displacement curves of the joints between the secondary beams and primary beams, as well as two typical failure modes are obtained. By using ABAQUS, three-dimensional solid finite element model of the proposed joint is established. The accuracy of the finite element analysis is verified by comparing with the experimental results. Based on the parametric analysis of the hanger joints, the influence of the thickness and width of the hanger flanges on the shear capacity and stiffness of the joints is studied. Calibrated by the detailed stress analysis and the test results, a simplified mechanical model is proposed, and prediction formulae for the shear capacity and failure modes of the hanger joint are recommended, which are in good agreement with the experimental results.