Analysis of steel fiber reinforced concrete wall-column connection using headed bars subjected to blast loading

The rising frequency of terrorist attacks and accidental explosions in recent years has underscored the necessity of incorporating blast-resistant design considerations into structural engineering. Blast loads, though uncommon, are highly dynamic in nature and can cause catastrophic failure in conventional reinforced concrete structures if not properly accounted for. This study focuses on analyzing the structural behavior of precast steel fiber reinforced concrete (SFRC) wall-column connections utilizing headed bars as the primary connection mechanism when subjected to blast loading. Four connection configurations are examined: (1) conventional dowel bar connections, (2) headed bar connections, (3) dowel bar connections with steel fibers, and (4) headed bar connections with steel fibers. The inclusion of steel fibers is intended to enhance ductility, energy absorption, and crack resistance under extreme loading. Numerical modeling and simulation are performed using ANSYS Workbench, employing nonlinear dynamic analysis to evaluate response parameters such as displacement, stress distribution, and failure mode under varying charge weights and standoff distances. Results are expected to demonstrate that SFRC with headed bar connections provides superior blast resistance compared to conventional systems due to improved anchorage, reduced stress concentration, and enhanced post-cracking behavior. The findings aim to contribute to the development of efficient, blast-resistant connection systems for precast structural elements, improving overall safety and resilience in modern construction practices.