Gap study on concrete filled steel tube (CFST) and concrete filled double steel tube (CFDST) columns subjected to blast loads

Columns are essential structural components that must be assessed for potential hazards, including blast loads. Such loads pose significant risks to both civil and military infrastructure, whether caused by terrorist attacks or accidental explosions. This study conducts a comprehensive review of existing research on the blast response of concrete-filled steel tube (CFST) columns and concrete-filled double steel tube (CFDST) columns. Moreover, it includes recent research on the behavior of RC columns under blast loading, as they are a traditional and common structural shape. Furthermore, it reviews papers that discuss different methods for strengthening and retrofitting RC columns. The presented research focused on the performance of columns under close-in and contact blast loads, as these are considered more damaging and influential for columns than far-range blasting. Previous studies have examined the behavior of these columns using analytical, numerical, and experimental methods. The combined use of experimental and numerical approaches allows for a more thorough understanding of their dynamic response to blast loads. Furthermore, the study identifies key research gaps and suggests directions for future investigations in this field.