Abstract:The tests on thirteen specimens of casing joints of square steel tube were conducted to investigate the flexural behavior of the joints. At the same time, the numerical simulation studies on that of the joints were carried out by using finite element analysis software ANSYS/LS-DYNA with consideration of geometric nonlinearity, material nonlinearity and contact nonlinearity. On this basis, the effects of tube wall thickness, tube edge length, and inserting depth on failure mode, ultimate flexural capacity and deformation of casing joint of square steel tube was discussed. The results show that there are two types of failure modes, i.e., inside tube yield failure and outside tube shear failure, when the joints are subjected to lateral load. Ultimate flexural capacity and rigidity of casing joint of square steel tube increased with the inserting depth increasing. The ultimate flexural capacity of the joint is proportional to tube shear strength, tube wall thickness, inserting depth, and tube edge length. The fruits are useful to the design and application of casing joints of square steel tube.
For the damage location in the existing damage identification methods, this paper adopts the progressive partition method in view of the modal strain energy to locate and evaluate the bars’ damage degree in the K8 single-layer reticulated shell model. Through the correlation between damage identification index and damage degree, the location and damage degree of damage element can be precisely determined. Meanwhile, this method can effectively improve the anti-noise performance in the damage identification of structural, and determine the key elements for the overall stability of single-layer reticulated shells under specific loads. The research provides a basis for the diagnosis and reinforcement of damaged structure.
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