Behavior of Steel Plate Girders with Web Openings Loaded in Shear


The structural behavior of three steel plate girders under shear is studied. The firstone is the reference plate girder (G) which is prepared without web openings, and thesecond one (GO) is fabricated to contain circular opening at the center of each web panel,the diameter of the opening is 60% of the web depth, while the third plate girder (GOR)is with reinforced strip welded around the circular web openings. The aspect ratio of thepanels is one and they all have the same dimensions. The experimental results obtainedfrom second and third plate girders have been compared with those obtained from thereference plate girder. The comparison indicates that the reduction in the ultimate shearload for plate girder with web opening is 51% and for the plate girder with reinforcedweb opening is 35%. Also through the experimental results, new formulas are presentedto predict the ultimate shear load of perforated steel girders with large openings.A nonlinear finite element analysis is carried out for the tested plate girders using thepackage software program (ANSYS V.11). The analytical results contain the ultimateshear capacity and Von Mises stress distribution. The results of finite element models arecompared with results of experimental tests. The difference in ultimate shear load was10%, 9% and 1.5% for plate girders GO, GOR and G, respectively. Also a parametricstudy with varying size of the reinforcement around the web openings is performed byusing the ANSYS program, and it is found that the thickness of the reinforcement striphas higher effect than its width on the ultimate shear capacity of perforated plate girder.