Abstract
A matrix formulation to account for P− Δ effects in computer seismic analysis of multistory buildings is presented. The method employs a linear solution approach requiring no iteration and can be used for static or dynamic elastic analyses. Amplified P− Δ effects resulting from inelastic displacement levels which may occur during a major earthquake can be accounted for in an approximate manner. The method has been implemented in a computer program and sample seismic analyses of a 31-story building are presented. Observations on the appropriate use and interpretation of analyses are made.
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