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    Lateral-Torsional Buckling of Stepped Beams

    Source: Journal of Structural Engineering:;2003:;Volume ( 129 ):;issue: 011
    Author:
    Jong S. Park
    ,
    J. Michael Stallings
    DOI: 10.1061/(ASCE)0733-9445(2003)129:11(1457)
    Publisher: American Society of Civil Engineers
    Abstract: Continuous multispan beams with stepped cross sections at the interior supports are common in construction of steel buildings and bridges. Design equations for lateral-torsional buckling (LTB) resistance in the American Institute of Steel Construction LRFD Specifications in 1998 account for only prismatic and web-tapered beams. A study of LTB capacity of stepped beams was performed and simple design equations are proposed. Finite-element method buckling analysis results for stepped beams under uniform moment were used to develop new design equations that account for the change in the cross section of stepped beams. Traditional moment gradient factors for prismatic beams were reviewed and were found to be sufficiently accurate for some stepped beam cases. A new moment gradient factor equation was developed from the finite-element analysis results and is proposed for the determination of the LTB resistance of stepped beams under general loading conditions.
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      Lateral-Torsional Buckling of Stepped Beams

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    contributor authorJong S. Park
    contributor authorJ. Michael Stallings
    date accessioned2017-05-08T20:58:32Z
    date available2017-05-08T20:58:32Z
    date copyrightNovember 2003
    date issued2003
    identifier other%28asce%290733-9445%282003%29129%3A11%281457%29.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/33955
    description abstractContinuous multispan beams with stepped cross sections at the interior supports are common in construction of steel buildings and bridges. Design equations for lateral-torsional buckling (LTB) resistance in the American Institute of Steel Construction LRFD Specifications in 1998 account for only prismatic and web-tapered beams. A study of LTB capacity of stepped beams was performed and simple design equations are proposed. Finite-element method buckling analysis results for stepped beams under uniform moment were used to develop new design equations that account for the change in the cross section of stepped beams. Traditional moment gradient factors for prismatic beams were reviewed and were found to be sufficiently accurate for some stepped beam cases. A new moment gradient factor equation was developed from the finite-element analysis results and is proposed for the determination of the LTB resistance of stepped beams under general loading conditions.
    publisherAmerican Society of Civil Engineers
    titleLateral-Torsional Buckling of Stepped Beams
    typeJournal Paper
    journal volume129
    journal issue11
    journal titleJournal of Structural Engineering
    identifier doi10.1061/(ASCE)0733-9445(2003)129:11(1457)
    treeJournal of Structural Engineering:;2003:;Volume ( 129 ):;issue: 011
    contenttypeFulltext
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