Study of Steel I Beam with the Trapezoidal Corrugated Versus Flat Web For LTB With Respect To Linear and Non-Linear FEM.

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Addis Ababa University


Steel beams with corrugated web are widely used because of their high load-carrying capacity and optimized configuration to resist lateral-torsional buckling (LTB). The purpose of this thesis is to provide a comparative study of elastic buckling analysis and linear FE analysis and nonlinear FE analysis as well as hand calculation. The author focuses on LTB of plate girders with trapezoidal corrugated and flat webs. This comparative study is performed through two groups of plate girders with corrugated and flat webs under consideration four types of steel classes. While in the numerical study, the elastic-plastic material model, residual stress distribution, and geometrical imperfections factors are considered for both flat and corrugated web. Thirty individual data types of different sample dimensions were examined for two types of girders, one girder with flat webs and an identical girder with the corrugated web. The samples are 15 flat web beams with three slenderness categories and 15 corrugated web beams with the same three slenderness categories. For the sake of control, the expected outcome, initial random crosssection dimensions are generated concerning three values of non-dimensional slenderness ratio ranges: 0.4, 0.6, and 1.2, corresponding to very stocky, intermediate, and very slender slenderness properties respectively to draw a sample which represents a total population. Besides, the comparison considers one type of plate girder with flat and an identical corrugated web within particular engineering parameters. To carry out a comparative study into the behavior of trapezoidal corrugated steel and flat webs, an advanced finite element analysis has been employed to understand buckling problems and to investigate the behavior of beams. FE-simulations are performed to represent the conditions of reality as good as possible and empirical hand calculations are made to verify the results. The corrugated web has an increased load capacity and stiffness by (32-67%), (12-31.3%) and (0.058%-0.418%) for very slender, intermediate, and very stocky respectively than flat web beams. A comparison study between flat web with web stiffeners and corrugated web I beam is suggested as a topic for future research.



Corrugated web, Flat web, Lateral torsional buckling (LTB), slenderness ratio