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摘要
The single-layer reticulated shell structure is a defect-sensitive structure, and the overall stability is the key to structural design. Multiplanar tubular joints can be used in single-layer reticulated shell structures, so it is necessary to carry out three-dimensional solid finite element analysis of the joints, and study the mechanical properties of the joints on this basis. In this paper, the overall stability analysis method of single-layer reticulated shell structure and the three-dimensional solid finite element analysis method of multiplanar tubular joints are summarized. For the special-shaped single-layer reticulated shell structure, the static performance of the structure, the influence of structural grid and building shape on the structural bearing capacity are studied, and the elastic stability bearing capacity and the elasto-plastic stability bearing capacity of the structure are determined. The finite element analysis of multiplanar tubular joints is carried out to obtain the stress distribution of the joints, and the influence of the hidden part of the joints with or without welds on the mechanical properties of the joints is studied. The results show that the curvature change and structure mesh of the special-shaped single-layer reticulated shell have a great influence on the stress of key members, and the stability bearing capacity plays a controlling role in the single-layer reticulated shell structure. The elasto-plastic stability analysis of the special-shaped single-layer reticulated shell shows that the structural safety factor reaches 24. The weld in the hidden part has a great influence on the bearing capacity of the joint, so after setting the weld in the hidden part, the maximum stress of each member of one joint can be reduced by more than 20%. ? 2024 Science Press.
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