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提出对网壳结构中节点的一种新的分类体系。为了确定分类体系,考虑了节点的刚度和抗弯能力,以及网壳结构的整体结构性能。根据新的分类体系,网壳中的节点可以分为:刚性、半刚性或者铰接。刚性节点有较高的抗弯刚度和承载力,而铰接节点的相对较低,半刚性节点的刚度和承载力大小处于二者之间。基于节点的刚度和极限弯矩,给出了系数α和β的值。这些系数用于确定清晰的分类界限。一些数值结果证实了分类体系的有效性。最后,提出了一个有效的设计程序,用于帮助设计人员为网壳结构选择合适的节点形式。
A new classification system of nodes in the shell structure is proposed. In order to determine the classification system, the stiffness and bending resistance of the joints are considered, as well as the overall structural performance of the reticulated shell structure. According to the new classification system, the nodes in the reticulated shell can be divided into: rigid, semi-rigid or hinged. Rigid joints have higher flexural rigidity and bearing capacity, while the hinged joints are relatively low, and the stiffness and bearing capacity of the semi-rigid joints are in between. Based on the node stiffness and the ultimate bending moment, the values of the coefficients α and β are given. These coefficients are used to establish a clear classification threshold. Some numerical results confirm the validity of the classification system. Finally, an effective design procedure is proposed to help designers select the appropriate node form for the reticulated shell structure.