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Lateral-torsional buckling of vertically layered composite beams with interlayer slip under uniform moment
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2012 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 34, 505-513 p.Article in journal (Refereed) Published
Abstract [en]

The lateral-torsional stability of vertically layered composite beams with interlayer slip is investigated in this paper, based on a variational approach. Vertically layered elements are typically used in timber engineering but also in case of laminated glass elements. Both across-longitudinal or vertical slip due to rotation and longitudinal or horizontal slip due to lateral deflection are discussed. The theoretical framework of the lateral-torsional buckling problem is given, and some engineering closed-form solutions are presented for partially composite beams under uniform bending moment. Simplified kinematical relationships neglecting the axial and vertical displacements of the sub-elements give unrealistic values for the lateral-torsional buckling moment. Refined kinematical assumptions remove this peculiarity and render sound buckling moment results. Inclusion of the horizontal and vertical slips significantly affect the lateral-torsional buckling moment of these vertically laminated elements. A single lateral-torsional buckling formulae is derived, depending on both the horizontal and the vertical connection parameters. (C) 2011 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2012. Vol. 34, 505-513 p.
Keyword [en]
lateral-torsional buckling, layered wood beams, partial interaction, composite beams, sandwich beam, interlayer slip, laminated glass beams
National Category
Engineering and Technology
URN: urn:nbn:se:umu:diva-52026DOI: 10.1016/j.engstruct.2011.10.004ISI: 000299150200045OAI: diva2:495536
Available from: 2012-02-09 Created: 2012-02-08 Last updated: 2012-02-09Bibliographically approved

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Girhammar, Ulf Arne
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