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http://dx.doi.org/10.7781/kjoss.2018.30.1.001

Strength and Lateral Torsional Behavior of Horizontally Curved Steel I-Girders Subjected to Equal End Moments  

Lee, Keesei (School of Civil, Environmental and Architectural Engineering, Korea University)
Lee, Manseop (Bridge International, COWI A/S, Kongens Lyunby)
Choi, Junho (Department of Ocean Engineering, Texas A&M University)
Kang, Youngjong (School of Civil, Environmental and Architectural Engineering, Korea University)
Publication Information
Journal of Korean Society of Steel Construction / v.30, no.1, 2018 , pp. 1-12 More about this Journal
Abstract
A curved member should resist bending and torsional moments simultaneously even though the primary load is usually supposed to be gravitational load. The torsional moment causes complicate stress state and also can result in early yielding of material to reduce member strength. According to analysis results, the strength of a curved member that has 45 degrees of subtended angle could decrease more than 50% compare to straight girder. Nevertheless, there have been very few of researches related with ultimate strength of curved girders. In this study, various kinds of stiffness about bending, pure torsion and warping were considered with a number of models in order to verify the main factor that affects ultimate behavior of curved girder. Lateral and rotational displacement of curved member were introduced as lateral-torsional-vertical behavior and bending-torsional moment interaction curve was derived. Finally, a strength equation for ultimate moment of horizontally curved steel I-girders subjected to equal end moments based on the interaction curves. The equation could take account of the effect of curvature, unbraced length and sectional properties.
Keywords
Steel; Curved girder; Nonlinear; Strength; Torsion;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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