الفهرس 
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Abstract
Corrugated plates are gaining increased attention from researchers based on their recent extensive use in structural engineering, thanks to their numerous merits. For example, corrugated webs provide lighter and more economic structures, increasing flexure strength (due to the increase in the warping constant) and good appearance. Generally, to increase the cross-sectional efficiency of the girder to out-of-plane bending, the cross-sectional elements would better be placed furthest from the neutral axis. On the other hand, increasing the depth of the cross-section, the web becomes slender and may buckle easily due to shear buckling. Accordingly, to decrease the slenderness ratio of the web without reducing the web height or increasing the web thickness, corrugated web becomes the best choice to provide the stability against elastic buckling of the web. However, tests on the flexural behaviour of plate girders with trapezoidally corrugated web (PGCWs) are still scarce in the literature. Accordingly, the purpose of this research is to provide the fundamental behaviour and strength of laterally-unrestrained trapezoidally PGCWs by experimental and numerical investigations. In the experimental test the middle parts of the specimens, where the corrugated webs exist, are loaded in pure bending moment by adopting the four-point loading process. Three PGCWs are tested experimentally by changing the flange width and web height, with corrugation dimensions kept the same. The flange width varies from 80mm to 100mm and the web height changes from 300mm to 400mm. The girders are found to fail by the lateral-torsional buckling mechanism without any local flange buckling or web distortion. After that, ABAQUS software is used to explore the influence of different.