Life-cycle performance of concrete-filled steel tubular column subjected to corrosion and impact

A finite element analysis (FEA) model was established to simulate the life-cycle performance of a concrete-filled steel tubular (CFST) column under the coupling effects of progressive and shock degradations. The imposed effects on the composite column covered a wide range of factors that may deteriorate its mechanical performance during the entire life-cycle, including construction issues (preload, residual stress, and imperfection), sustained load (axial load from upper structure), progressive degradation (chloride corrosion) and shock degradation (impact load). The numerical model was stage-by-stage verified with experimental results and showed good accuracy. It was then employed to analyze the performance of CFST column under the coupled degradations. Particularly, the effect of the coupled effects on the remaining capacity of the column was evaluated, which highlights the importance of the life-cycle design and assessment for the CFST columns.