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        Cross-Section Properties and Elastic Lateral-Torsional Buckling Capacity of Steel Delta Girders

        Omar Y. El Masri,Eric M. Lui 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3

        In this paper, the behavior of slender steel delta girders (SDG) is investigated both analytically and numerically. In the analytical analysis, closed-form equations for cross-section properties of SDG are derived. They are then compared with solutions obtained numerically. Using these cross-section properties, the theoretical elastic lateral-torsional buckling (LTB) strength of these girders are determined and compared with results obtained from a fi nite element analysis. The results show that the theoretical LTB equation derived for general open monosymmetric I-sections can be applied to these delta girders. Additionally, it is shown that a simplifi ed expression for the coeffi cient of monosymmetry x derived for I-sections can be used in the computation of LTB strength for SDG. A parametric study is then performed to demonstrate the eff ectiveness of SDG in achieving a favorable strength-to-weight ratio when compared to standard I-section members. Based on the results of this parametric study, it is recommended that the height and width of the delta region of the cross-section be equal to two-fi fth the height of the web and three-quarter the width of the compression fl ange, respectively.

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