Local buckling of RHS members under biaxial bending and axial force

Luís Vieira, Rodrigo Gonçalves, Dinar Camotim

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This paper aims at providing an in-depth analysis of the local plate buckling coefficients for thin-walled rectangular hollow sections (RHS) subjected to biaxial bending and/or axial force. For the determination of these coefficients, a computational efficient Generalised Beam Theory formulation is implemented in a MATLAB code, capable of calculating accurate local buckling loads with a very small computational cost and, therefore, making it possible to conduct extensive parametric studies in a very short period of time. Taking advantage of the small longitudinal half-wavelength nature of the local buckling mode, semi-analytical solutions using sinusoidal half-wave amplitude functions may be employed for the GBT cross-section deformation modes. The code then computes the lowest local buckling load by varying the member length and using the “golden-section search” algorithm. Although most of the paper is devoted to cross-sections without rounded corners, the code is also capable of handling rounded corners and a preliminary study concerning its effect on the buckling coefficients is also presented.
Original languageEnglish
Title of host publicationProceedings of the 8th International Conference on Thin-Walled Structures (ICTWS 2018)
Place of PublicationLisbon
PublisherUniversidade de Lisboa
Number of pages20
Publication statusPublished - 24 Jul 2018
Event8th International Conference on Thin-Walled Structures (ICTWS 2018) - Lisbon, Portugal
Duration: 24 Jul 201827 Jul 2018
Conference number: 8th


Conference8th International Conference on Thin-Walled Structures (ICTWS 2018)
Abbreviated titleICTWS 2018


  • Local buckling
  • Rectangular hollow sections
  • Axial force
  • Biaxial bending
  • Axial force and biaxial bending
  • Generalized Beam Theory


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