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6. Analysis
PyNite can perform a static analysis using the FEModel3D.Analyze(check_statics=True) command.
PyNite can perform P-Δ analysis on framed structures using the FEModel3D.Analyze_PDelta(max_iter=30, tol=0.01) command. It doesn't yet support P-Δ effects on plate structures. The P-Δ analysis should not be confused with a P-δ analysis. The AISC 360 specification and commentary (a free download at AISC's website) discusses the difference between the two types of analyses. P-δ effects (if significant) can be included by further breaking members into series of smaller members.
By default, PyNite checks for a convergence tolerance within 1%. Also by default, if convergence doesn't occur within 30 iterations analysis stops and PyNite reports divergence. These values can be customized by providing alternate values for max_iter and tol when the FEModel3D.Analyze_PDelta() method is called.