基于异型件连接的胶合木网壳节点受力性能研究

Research on mechanical behavior of joints based on special-shaped connection in reticulated glulam shell

为了减轻节点自重同时提高结构美观性,有必要开展新型木网壳节点连接形式研究。以已提出的新型K6网壳销式连接节点作为原始方案,进行2次改进。通过轴压性能试验确定改进方案1的有效性后,对改进节点进行抗弯性能试验。在此基础上提出改进方案2,并采用有限元分析的方法研究因试验条件受限导致的难以同时施加轴压力和竖向荷载的问题。结果表明:改进方案1受安装偏差影响较小,其实际承载力未像原始方案那样低于预期承载力设计值;节点中的异型钢连接件自重较目前应用较多的网壳节点轻20%~50%,在轴压性能试验中具有较好的弹性变形性能,抗弯性能试验中具有一定的塑性变形性能;改进方案2节点在轴压和竖向荷载共同作用时的受力性能明显优于竖向荷载单独作用时,说明轴压力对节点抗弯承载力有利;改进方案2节点抗弯承载力较改进方案1更有优势,经数据优化后提出的钢板厚度建议可为工程设计提供参考。

In order to reduce the self-weight of joints and improve the aesthetics of structures,it is necessary to carry out the research on the new connection form of reticulated timber shell joints.The new pin connection for K6 reticulated shell was taken as the original scheme,and the scheme was improved twice.After the effectiveness of the improved scheme 1 was determined by the axial compression performance test,the flexural performance test of the improved joint was carried out.On the basis,the improved scheme 2 was proposed,and the finite element analysis method was used to research the problem that it was difficult to apply axial pressure and vertical load at the same time due to the limited test conditions.The results show that the improved scheme 1 is less affected by the installation deviation,and its actual bearing capacity is not lower than the expected design value as the original scheme.The self-weight of the special-shaped steel connector in this joint is 20%-50%lighter than that of the reticulated shell joint,which is widely used at present.It has good elastic deformation performance in the axial compression performance test and certain plastic deformation performance in the flexural performance test.The joint mechanical performance of the improved scheme 2 under the combined action of axial compression and vertical load is obviously better than that under the single action of vertical load,which illustrates that the axial pressure is beneficial to the flexural capacity of the joint.The flexural capacity of the joint of improved scheme 2 is more advantageous than that of improved scheme 1.The steel plate thickness suggestion put forward after data optimization can provide reference for the engineering design.