Elastic Buckling Loads of Hinged Frames by the Newmark Method

Ashraf Badir

Abstract
A numerical method for the solution of the elastic stability of hinged frames is presented. The Newmark iterative procedure to perform elastic buckling analyses for isolated columns is extended for use in computing buckling loads and buckling modes in frames with hinged columns. The method is illustrated in details by means of different cases of single-storey portal frames commonly used in commercial buildings. Comparisons of obtained results with other well known methods show very good agreement.

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