الفهرس 
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Abstract
The corrugated steel plates are widely used as a structural element in many fields of applications because of their favourable properties and have been applied since the 1920s. For the last 20 years they have been increasingly used in aircraft design, shipbuilding for containers, as cold-formed webs for long span roof beams and later for structural engineering applications in building and bridges.
This study aims to discuss the lateral torsional buckling behavior of steel girders with corrugated webs without openings and compare between them and those with openings. The effect of corrugated webs with and without openings on lateral torsional buckling is studied. The warping constant formulas for steel girders with corrugated webs are proposed from the previous studies. Different Parameters that affect the behavior of these girders are studied such as web height, web thickness, flange width, flange thickness, and corrugation width. Also, different shapes of corrugations, as well as different shapes and positions of openings in the corrugated web girders have been studied.
Finite element analysis is performed using ANSYS program and all analyzed girders are simulated using shell element with elastic perfectly plastic material. All studied girders specimens are simply supported beams and subjected to two equal end moments to study the lateral torsional buckling behavior of girders under single curvature.
from the finite element analysis results it was found that the warping constant formula of Moon etal. [10], for plate girders with corrugated webs is more accurate than that of Lindner. J. [1]. Additional, lateral torsional buckling resistance for girders with corrugated webs was increased by increasing: web thickness, web height, flange width, and flange thickness, while it decreased by increasing the corrugation width. Girders with rectangular web corrugations have lateral torsional buckling resistance more than girders with triangular or trapezoidal web corrugations. Euro-code [26] equations for calculating lateral torsional buckling moments for plate girders with corrugated webs give results more conservative results to that from the finite element analysis. The lateral torsional buckling moment for corrugated web girders without openings is very close to those of girders having openings in the web because the critical lateral torsional buckling moments are strongly dependant on the flanges of the girders and not on the web. The lateral torsional buckling moment for corrugated web girders with openings having openings near the tension flange is higher than other girders which have the openings near the compression flange. Lateral torsional buckling moments for corrugated web girders with circular openings are higher than those having square openings. The value of the critical lateral torsional buckling moments for girders decrease with the increase of the opening depth to web height ratio.