stručni rad
In this paper derivation of differential equation describing buckling of a column with initial geometrical imperfections and variable cross – section is presented. The column geometry (the cross section) is changeable (variable), for the purpose of achieving higher load carrying capacity at given load set with optimizing the material quantity. A solution of the differential equation has been obtained by the collocation method. The assessment of safety (carrying capacity) of such a loaded column is carried out comparing the extreme stress in the deformed column with the material limit stress value with a dictated safety factor. Side loads, such as the wind pressure, is condensed into a side force at the column tip. The vertical loads act twofold on the columns ; directly compressional and indirectly flexural through the horizontal beam and column joint due to flexing of horizontal beam. The results show improvement in safety by adding simple widening of hot rolled standard HE profiles by inserting distance plates and welding.
safety, column, frame structure, buckling, geometrical imperfection.
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