Dynamic behaviour of laterally-impacted circular CFST columns combined with corrosion defects: Novel simulation and design methods

Concrete-filled steel tubular (CFST) structures are frequently subjected to the detrimental effects of corrosion defects and impact hazards during their service life. Nonetheless, there is a notable gap in research concerning the laterally-impacted performance of CFST members having corrosion issues. To address this, this paper employed MATLAB code programming and stochastic functions to develop a dynamic analysis model for simulating the laterally-impacted responses of the corroded circular CFST columns, incorporating the stochastic distribution characteristics of corrosion defects. The accuracy of the model was subsequently verified through relevant experimental tests. The influence of various parameters, such as the corrosion ratio, the location and energy of the impact, etc., on the development rules of the dynamic impact force, deflection deformation and energy consumption was thoroughly investigated. Furthermore, the characteristic failure forms, impact force diffusion pathways, impact time history curves and interface contact effects of circular CFST columns with corrosion defects under lateral impact were elucidated. Finally, a design methodology for predicting the resistant capacity of the laterally-impacted circular CFST column combined with corrosion defects was proposed based on the energy consumption analysis. The findings implied that the presence of corrosion defects significantly diminishes the lateral impact resistant capacities of circular CFST columns. As the corrosion ratio increases, both the impact force and energy dissipation of the columns decrease markedly, while the lateral deflection increases. Additionally, the severity of denting deformation in the steel tube and the damage to the core concrete under lateral impact become more pronounced with the intensification of corrosion defects.