الفهرس 
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Abstract
Plate girders are widely used in bridge design as well as industrial building. It has been known that their design is largely governed by buckling behavior of the web because of its large depth to thickness ratio. Thus,in the design of plate girder web panels, it is required to evaluate accurately the elastic buckling strength under shear, whether or not the post-buckling strength is accounted for. The analysis of these structures are also become more difficulty if the webs containing cutouts. These cutouts are often provided for inspection, maintenance and services purposes. The size and the position of these cutouts could be significant. Currently, in most specifications, buckling stresses are calculated by assuming conservatively that the web panels are simply supported at the juncture between the flange and web. However, depending upon the geometry and the properties of the plate girder, the elastically restrained supports of the web at flanges may behave rather closer to a built-in support.
This research is directed to determine the buckling stresses in web panels subjected to shear force containing web cutouts assuming that the boundary conditions along the junction between the webs and the flanges as built-in. The other boundary conditions along the position of the vertical stiffeners are assumed to be simply supported due to the relatively small stiffness of the stiffeners.
The proposed analysis is derived using the minimum potential energy concept in order to obtain a direct equation from which buckling shear stress can be deduced for different sizes of cutouts and also different positions.
Pursuing the importance of obtaining a convenient design procedure for the design of web with cutouts, many graphs are presented in order to obtain the maximum theoretical shear loading for such webs.