Shear resistance of headed studs in modern profiled steel sheeting transverse to supporting beams under elevated temperature

The load-bearing behaviour of headed studs in modern-shaped trapezoidal sheets that span perpendicular to the beams axis has been the focus of several recent research activities. The results have led to new design approaches for the second generation of Eurocode EN 1994-1-1:2024 E [1]. However, these developments also raise key questions regarding the design of headed studs under elevated temperatures. This paper investigates whether the existing design procedures in EN 1994-1-2:2005 [2] are still applicable to modern trapezoidal sheets and how they can be combined with the new design approaches of EN 1994-1-1:2024 E [1]. To address these questions, 18 push-out tests were performed at both ambient and elevated temperatures. Three different modern profiled sheet geometries were tested, including central, paired and staggered arrangements of headed studs. The experimental results were compared with the analytical calculations of EN 1994-1-2:2005 [2] with regard to load capacity and temperature development. A proposal was made for combining the new formulations in EN 1994-1-1:2024 E [1] with the known temperature-dependent reduction factors from EN1994-1-2:2005 [2]. It has been shown that the proposed approach results in a more accurate estimation of the load capacity of head studs under elevated temperature and a closer prediction of the failure mode.