木网壳节点半刚性研究

Research on Semi-rigidity of the Joint of Wooden Latticed Shell

木网壳节点多数介于刚接和铰接的一种半刚性节点,选择一种螺栓钢填板节点,进行JD1、JD2两组节点抗弯试验,通过改变节点的螺栓排数体现节点弹性阶段抗弯刚度的不同,得到其荷载-位移曲线和弯矩-转角曲线。在此基础上,建立节点多段梁模型,根据力法计算模型弹性段跨中位移理论值。利用Beam189的非线性广义梁截面特征模拟节点域和杆件之间的连接部位,建立有限元模型,得到分析值,将其结果与试验值和理论值对比,验证简化模型的合理性。最后将多段梁模型运用到木网壳半刚性模型中,考虑节点刚度对网壳极限承载力的影响。

Most of the reticulated timber shells ar connected by a semi-rigid connection between rigid and articulated joints. In this paper,a kind of bolt-steel-plate joint was selected to carry out the bending test of JD1 and JD2, and the load-displacement curve and the bending-moment curve are obtained. The number of bolts was changed to reflect different flexural rigidity. A multi-section beam model is established based on the experiment,and the theoretical value of the displacement is calculated according to the force method. The nonlinear finite element model of Beam189 is used to simulate the connection between the node domain and the bar. The analytical results are compared with the experimental and theoretical values to verify the rationality of the simplified model. Finally, the muhi-section beam model is applied to the semi-rigid model of reticulated timber shell, and the effect of the joint stiffness on the uhimate bearing capacity of the shell is considered.