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Steel and Composite Structures
  Volume 8, Number 2, April 2008 , pages 159-178

Buckling of restrained steel columns due to fire conditions
Tomaz Hozjan, Igor Planinc, Miran Saje and Stanislav Srpcic

    An analytical procedure is presented for the determination of the buckling load and the buckling temperature of a straight, slender, geometrically perfect, axially loaded, translationally and rotationally restrained steel column exposed to fire. The exact kinematical equations of the column are considered, but the shear strain is neglected. The linearized stability theory is employed in the buckling analysis. Behaviour of steel at the elevated temperature is assumed in accordance with the European standard EC 3. Theoretical findings are applied in the parametric analysis of restrained columns. It is found that the buckling length factor decreases with temperature and depends both on the material model and stiffnesses of rotational and translational restraints. This is in disagreement with the buckling length for intermediate storeys of braced frames proposed by EC 3, where it is assumed to be temperature independent. The present analysis indicates that this is a reasonable approximation only for rather stiff rotational springs.
Key Words
    restrained steel column; inelastic buckling; Reissner beam; high temperatures; critical temperature.
Tomaz Hozjan1,2*, Igor Planinc1, Miran Saje1 and Stanislav Srpcic1;
1University of Ljubljana, Faculty of Civil and Geodetic Engineering, Jamova 2, SI-1115 Ljubljana, Slovenia
2Trimo d.d., Prijateljeva cesta 12, 8210 Trebnje, Slovenia

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