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Modified Moment Gradient Correction Factor of Nonprismatic Beams  

Park, Jong Sup (상명대학교 토목환경공학부)
Publication Information
Journal of Korean Society of Steel Construction / v.18, no.2, 2006 , pp. 191-201 More about this Journal
Abstract
New design equations for calculating the lateral-torsional buck ling moment resistances of stepped I-section beams with/without continuous lateral top-flange bracing subjected to a point load, a series of point loads, and a uniformly distributed load, are suggested based on the results of elastic finite-element analyses. The new equations presented in this study are compared with the current moment gradient modifiers presented by other researchers and specifications. Although the study paper presents mainly stepped-beam cases subjected to a point load and a uniformly distributed load. The proposed equations include the length-to-height ratio effects for stepped beams with continuous lateral top-flange bracing. The new moment gradient correction factors could be easily used to calculate the lateral-torsional buckling moment resistance of stepped I-beams.
Keywords
Lateral-torsional buckling; beam design; length-to-height ratio; moment gradient correction factor;
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