Abstract
The article deals with the verification of resistance of torsionally restrained hot-rolled beam-columns of H or I cross-sectional shape and also of the perpendicular hollow cross-section subjected to the biaxial bending and axial compression. Results of analysis of the beam-column resistances according to methods of former STN 73 1401 [1] and the current STN EN 1993-1-1 [2] are compared with results of numerical approaches. The observed members are subjected to the normal force and to the transverse loads uniformly distributed along the length of both axes. The cross-sections of HEB 300, IPE 300 and RHS 300x200x10 were chosen to compare obtained results.
Highlights
Nowadays, the development of new materials creates a competitive environment for the use of steel as a structural material in constructions
The beam-column subjected to combination of bending moments and axial compression is an example of this problem
The resistance of member subjected to the combined biaxial bending and axial compression was verified by means of formulas according to STN 73 1401 [1]
Summary
The development of new materials creates a competitive environment for the use of steel as a structural material in constructions. In the case of the torsionally restrained beam-column along its length, i.e. the member whose effects of lateral-torsional buckling are eliminated by the relevant supporting, and considering the initial deflection in the direction of the y-y axis only, the system of differential equations (1) can be rewritten into the following elementary pair of independent differential equations, describing the buckling resistance of beam-column respecting the above mentioned cross-sectional shape and load.
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