عنوان مقاله [English]
Long span beams with heavy load require increasing the thickness of web and in many cases using a number of stiffeners needs to improve the lateral buckling difficulty. Development and application of corrugated steel web provides facilities to modify the web thickness of beam girders in the design and construction procedure. The attractiveness for using corrugated webs in bridges and composite sections has been increased in recent years. The new system combines the usage of either corrugated steel plates as webs or steel or reinforced/ prestressed concrete slabs as flanges.The application of corrugated steel web may reduce the thickness of webs and restricts it between 2 to 5mm while increases the portion of height/thickness of corrugated web girders in industrial structures up and about 260 and even for long span bridges up to 400.Manufacturers have produced different corrugated profiles such as sinusoid, trapezoid and other forms. The investigations show that the most significant weakness of application of the corrugated web beams is failure due to shear stress. The flanges are assumed to provide the flexural strength of the girder with no contribution from the corrugated web, which is assumed to provide the entire shear capacity of the girder. The corrugated web is thus, subjected to an “almost” pure shear stress state. Failure of a corrugated steel web plate may occur by the classical steel yielding of the web under a pure shear stress state. It may also occur by web buckling due to either local instability of any “panel” between two folds or overall instability of the web over two or more panels. An interactive failure mode between these different failure criteria represents another possibility of failure and so many researchers have considered global, local and semi global buckling in phenomena due to shear strength in their research work. In this paper nonlinear 3D Finite Element Model with regarding buckling modes phenomena for shear analysis of different profile shape of available manufacture corrugated webs is intended. The model is verified with published experimental results and sensitivity of the involved parameters is investigated. As presented in the following figure, the post-buckling strength of girders with corrugated steel webs could be investigated by this model.