INELASTIC BEHAVIOR OF MULTISTORY STEEL FRAMES.

The research work described deals with the inelastic behavior of multistory, planar steel frames. The study includes a review of different types of formulation for stability and strength analyses. A method to compute elastic buckling loads for multistory frames is discussed. A general approach to the elastic and inelastic nonlinear analyses of multistory frames is presented and a finite element formulation is developed. A technique to determine the load-deformation characteristics of frames, using the finite element equations is discussed. The inelastic analysis includes the effect of axial loads on the stiffness of the frame, gradual penetration of yielding in the cross section, and the spread of inelastic zones along the member length. The effects of residual stresses and strain hardening have been taken into account in the analysis.