Nowadays, plate girders with corrugated webs (PGCWs) are mostly used in long span beams and bridges. These girders are composed of flat flange plates and corrugated web plates connected through continuous welding. However, the shear strength and behavior of PGCWs have not yet been clearly explained specially for zigzag corrugated webs (PGZCWs). The objective of this paper is, accordingly, to provide the shear strength and behavior of such girders. Finite element (FE) analysis is generated considering the realistic initial imperfection amplitudes. The ABAQUS software is used to construct a nonlinear FE analysis, including geometric and material nonlinearities, based on realistic dimensions of PGZCWs. To ensure the accuracy of the FE models, they are verified using available experimental results in literature. The available design shear strength formulas, found in the available data base, are proposed for the trapezoidal corrugated webs. However, new design strength for PGZCWs is proposed by cr ,I using the interactive shear buckling strength formula ( t ) as proposed by the current authors.