Geometric investigation of perforated delta plate girder under shear force

Because of space limitation, it is unavoidable to pass the installations pipes, equipment, electric cables, and ventilation pipes among the web of plate girders. Therefore, the researchers have paied attention to the analysis of this plate girder behavior on the effect of bending and shear, and their strength with preparation holes in the web. In this case, investigations are performed to study the function of bending and shear capacity of plate girder with delta stiffener. The purpose of this paper is to analyze the delta plate girders with a circular hole in the web under shear force by the finite element method. The finding of the simulation is compared with the findings of the experiment to assure the accuracy of modeling. Then, a parametric study is done to analyze the effect of rigidity, slenderness, and also height and thickness parameters. Also, it was concluded that the optimum height parameter (ratio of stiffeners connection distance from the intersection at the web to upper flange, than to total height of plate girder) is 0.25, the optimum thickness parameter (ratio of stiffener thickness to the thickness of plate girder web) in range of 0.9 ~ 1.20, the optimum slenderness (ratio of plate girders height to the thickness of plate girder web) in range of 200 ~ 210, and the optimum rigidity (ratio of flanges thickness to thickness of plate girders web) in range of 0.9 ~ 1. Finally, it shows that the shear strength of the plate girder is increased by an increase in flange rigidity.