Abstract
The circular hollow section (CHS) X-joint hysteresis behavior significantly affects the seismic behavior of the steel tubular structure using this type of joint. The hysteresis behavior of this type of joint considering crack growth is studied by tests and numerical simulation. Two CHS X-joints were fabricated and tested under axial cyclic loading until the joints were cracked. The hysteresis curves of the joints, considering the influence of damage and fracture, were obtained, and the hysteresis performance of the joints was evaluated according to the curves. The VUSDFLD subroutine based on the ductile fracture model CVGM (cyclic void growth model) was embedded into ABAQUS, and the FE simulation of the test joints considering crack occurrence and growth was carried out. The test results are compared with the results of FE analysis, revealing that the proposed method accurately simulates the hysteresis behavior of these joints and the crack propagation behaviors under cyclic loads. The difference between the test and simulated crack initiation loads for the two joints is 10.8 % and 5.7 %, respectively.
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