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ETABS captures both sources of nonlinear geometry with great accuracy, well within the 3% and 5% limitation of AISC. This capability is validated in the benchmark-problem results, shown below, in which a column is divided into two segments and subjected to compression and uniform lateral load. Meshing the column is may be required to improve accuracy of P-δ effect in pinned condition cases and for axial loads close to buckling.
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