الفهرس 
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Abstract
Compressive bending stresses, shear stresses or combination of both m act in simply supported beam, continous beams and cantilevers, when they loaded transversally.
This research is mainly focused on the buckling behavior of the web plate plate girders in the portion of pure bending moment, in the case of sim supported beams subjected to concentrated loads. The aim is to provide reasonable tool for calculating the moment which causes buckling for the we plate taking into account the effect of the boundary conditions along the line junction between the web and the flanges.
In the theoretical investigation, a finite element model was developed usi ANSYS finite element program (Swanson Analysis System, Inc., 1992). T include the effect of large displacements on the behavior, a nonlinear geometr’ analysis was performed. In the experimental phase of this study, four girde were tested. The specimens were subjected to two concentrated loads located equal distances from the end supports causing a uniform bending momen between the loads. The portion of the girders between the applied load. constituted the test region and was designed separately from the end portion. which were heavily reinforced to prevent failure within these regions.
The procedure adopted in this research is directed to suggest some accurate and simple procedures from which a fairly good estimate for the critical moment may be obtained, taking into account the real boundary conditions. Thus, two different suggestions were undeliaken. The first formula can be used to determine the critical moment from practical or theoretical data concerning the relationship between applied loads and out-of plane web deformations. The second approach is concerned with the estimation of the critical moment from a reasonably accurate and simple stress distribution on the cross section.