| Abstrakt: |
In order to study the impact of axial compression ratio on the seismic performance of embedded steel tube concrete columns with T-shaped steel, ABAQUS finite element analysis software was used to model and analyze existing experiments. The reliability of the model was verified through indicators such as hysteresis curve, skeleton curve, and ultimate bearing capacity. Expansion analysis of different axial compression ratios was conducted on the basis of the verified model. The results show that the loading and unloading stiffness of the hysteresis curve of the model specimen are basically consistent with the experimental results, the skeleton curve is basically consistent, and the error of the ductility coefficient and positive and negative horizontal loads is within 5%. The simulated specimen exhibits stress concentration and concrete crushing damage at the column foot that is consistent with the experimental results; Stress analysis and mechanism analysis indicate that longitudinal reinforcement and compression/tension side T-shaped steel have significant constraints on the core concrete, while internal steel ribs mainly provide lateral stiffness. As the axial compression ratio increases, the specimen undergoes a transition from flexural failure to compressive shear failure, with a maximum degradation of about 10% in shear capacity and 51.9% in ductility. The critical axial compression ratio of the specimen is between 0.7 and 0.8, so it is recommended to design below 0.7. [ABSTRACT FROM AUTHOR] |
