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为研究空间网壳相贯节点的受力性能,采用有限元软件ABAQUS建立非线性杆系、实体有限元模型,深入探讨了圆筒相贯、直接相贯两种不同相贯形式节点在轴力、弯矩、剪力复合作用下的复杂应力、变形分布以及应力集中现象;利用两种不同方式,对节点域初始刚度进行评价;计算了节点的承载能力以及安全储备,并探讨了改进节点性能的设计方法。有限元分析结果表明:两种连接形式在应力、变形、承载力等方面基本一致,极限荷载约为设计荷载的2.04倍,具有较大的安全储备;圆筒相贯节点应力集中现象较直接相贯节点有一定缓解,应力集中现象可能会导致局部屈服,存在安全隐患,可通过加厚相贯区域、在此区域进行倒角处理等措施予以解决;圆筒相贯节点比直接相贯节点刚度大,直接与圆筒相连的杆件比既与圆筒相连又与旁边杆件相连的节点刚度大,根据欧洲规范的分类方法以及与杆系模型对比分析,两种形式节点在工程中可以视为刚性连接。
In order to study the mechanical behaviors of the reticulated joints of space reticulated shell, finite element software ABAQUS was used to establish the nonlinear rod system and solid finite element model. In-depth discussion was made on the relationship between two different coherent forms , The complex stress, deformation distribution and stress concentration under combined action of bending moment and shearing force. The initial stiffness of the node is evaluated by two different methods. The bearing capacity and safety reserve of the node are calculated, and the performance of improving node performance Design method. The results of finite element analysis show that the two connection forms are basically the same in terms of stress, deformation and bearing capacity, and the ultimate load is about 2.04 times of the designed load, which has a large safety margin. The stress concentration at the joints of the cylinder is more serious than the direct phase The nodes have some relief, stress concentration may lead to partial yield, there are potential safety problems, which can be thickened through the area, chamfering in this area and other measures to be resolved; cylindrical cross-section node than the direct stiffness of the junction Large, directly connected with the cylinder than the two connected with the cylinder and the adjacent rod stiffness of the node, according to European norms of classification and comparison with the rod model analysis, the two forms of nodes can be seen in the project For rigid connection.