Investigation of Steel I-Beams Strengthened Using CFRP and BFRP Sheets under Torsion

Torsional demand acting on beams can significantly effect structural behavior and cause high-local stresses. The torsional resistance of be potentially increased by using fiber-reinforced polymer (FRP) sheets. In this study, basalt (BFRP) carbon (CFRP) fabrics with different layouts are used to strength the steel I-beams, enhancement in is investigated experimentally numerically. First, 12 specimens reinforced BFRP CFRP bonded web I-beams three carry out experimental study. total, 14 tested under torsion including two reference beams. Second, a numerical model developed capture web-reinforced After verified satisfactorily, parametric study conducted evaluate FRP strengthening for flange-only full reinforcement alternatives. experiments, fully web-bonded configuration achieved 18% 14% increase capacities sheets compared reference, respectively. last, it discovered that flanges achieve up 43% increase.