The use of headed reinforcing bars has been limited to heavily reinforced structures such as offshore oil platforms, but it offers distinct advantages in ordinary reinforced structures such as reducing the required development lengths, enhancing the confinement of joints, and reducing reinforcement congestion, thereby facilitating the placement of reinforcement bars on site and concreting. The primary mode of failure for headed bars is concrete blowout failure which is more critical as cover and spacing between bars are reduced. FprEN 1992-1-1:2023 includes a new formulation to calculate the maximum tensile stress that can be developed in a reinforcing steel bar for a given head geometry and reinforcement layout.