Abstract
The buckling loads of columns with various boundary conditions and portal frames subjected to vertical loads on the top of the columns are calculated on the basis of the Reissner's Principle. In the analysis, the deflection and bending moment are assumed by polynomials. Total nine cases for polynomials are treated. In some cases, the buckling loads are obtained conservatively, comparing with the exact solutions. After that the alternative formula for evaluating an effective length factor of columns in a braced symmetrical frame is proposed. It is shown that the effective length obtained by the proposal formula agrees well and conservatively with the correct value.
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