The effect of steel beam used reinforcement plate to the beam flange in progressive collapse

Abstract

Progressive failure is a phenomenon in which an initial local failure or destruction from one element to another causes the collapse of the entire structural system or a large part of the structure. Considering that the behavior of structures in progressive failure can be related to various factors, including the way of transferring loads in nodes, therefore, the type of connections and their behavior can be very effective in progressive failure of the structure. In this research, we investigated one of the most widely used methods of steel beam reinforcement, reinforcement using steel sheets, and we investigated the effect of this type of reinforcement in progressive failure as one of the control measures to prevent local destruction. In this research, three geometrical parameters, including the length, width and thickness of the reinforcement plate in the wing of the beam, were investigated with the help of the Sap2000 software, in accordance with the guidelines of the 10th chapter of the National Building Regulations in a 5-story steel building. The performance of retrofitted steel buildings against progressive failure has been evaluated using nonlinear dynamic analysis and nonlinear static analysis methods, and finally, the effect of this type of retrofitting on the seismic performance of the structure has also been investigated.