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Local buckling of RHS members under biaxial bending and axial force
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Orientador(es)
Resumo(s)
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.
Descrição
The authors of this paper gratefully acknowledge the financial support provided by the Research Fund for Coal and Steel project RFCS-2015-709892, “Overall Slenderness Based Direct Design for Strength and Stability of Innovative Hollow Sections – HOLLOSSTAB”.
Palavras-chave
Local buckling Rectangular hollow sections Axial force Biaxial bending Axial force and biaxial bending Generalized Beam Theory