Theoretical and Experimental Behavior of Biaxially Loaded Inelastic Columns

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Abstract
A theoretical and experimental study of the inelastic behavior of biaxially loaded rectangular tubular steel columns is conducted. Test results are compared to those obtained analytically using the column deflection curves approach, with inelastic biaxial moment factors published previously by the authors. Special gimbals were developed to simulate biaxial end hinges, and the column behavior is studied in response to a constant axial load and a gradually increasing biaxial end moment, up to collapse. Test results are shown to be in good agreement with analysis. Also, neglecting column twisting in the analysis is found to be consistent with experimental observations.

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