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مقاله السیور- application of the equvalent column method for fleural buc

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APPLICATION OF THE EQUIVALENT COLUMN METHOD FOR FLEXURAL BUCKLING ACCORDING TO THE NEW EC3-RULES

Abstract

The rules in EN 1993-1-1 provide an approach for the stability check of members and frames under axial compression and bending with the “equivalent column method”. This method is based on the use of the specific buckling length of the structure and of first order internal forces. In addition, a second approach is provided where individual members are considered like “cut-out members” of the system with end-moments including the second order sway effects. For the check of equivalent members or cut-out members the appropriate moment diagram to be used in the design formula has not been defined in the code yet. The present paper – after explaining the conceptual background of the methods – deals with the application on individual members with different boundary conditions as well as on frame systems of sway type. Comparisons of the results of the code-formulae with numerical calculations were made to illustrate the efficiency of the different methods.

KEYWORDS

Eurocode3-Part 1, flexural buckling, equivalent member, effective length method, amplified sway method, member buckling, frame analysis