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Benchmark problems from the AISC 2010 Specification for Structural Buildings (commentary, page 16.1-276) have been reproduced in ETABS. The intention of AISC benchmark problems is to indicate whether or not an analysis software is capable of performing rigorous second order analyses which include P-Δ and P-δ effect.

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 segments and subjected to compression.


Figure 1 - P-δ response


Figure 2 - P-Δ response

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