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described here includes models for beam-to-column connections having nonlinear moment-rota- tion curves (including unloading composite steel !-shaped treats the cross-secti- as three rectangular elements. All cross-section effects are computed as analytic expressions relative to these rectangular elements and then in terms of overall section sections along the length will experience plastic strains in the presence of axial load and moment. In the regions where plastification predicted, the length of the plastic region as the distance from the point where elastic behavior ceases to the point of moment. the point of