Abstract
Using the approximate a slope-deflection equations in the elastic-plastic range suggested in the previous reports (Part I and II), the elastic-plastic behaviors of three-story frames are analyzed. Computational process in explained and numerical examples of three-story frames pinned and fixed at the bases are shown and discussed. Load-deflection curves for three-story frames with rectangular and H-section members are presented in cases of λ_1=15 and 30, (λ=slenderness ratio of column member), column thrust loads P_8=p, P_2=2P, P_1=3P, and axial column load ratio n_<01>=0.3. From the results of this study it is concluded that all frames under the assumed load conditions and frame geometry reach the stability limit before the collapse mechanism is developed and the critical load becomes considerably lower than the collapse load predicted by simple plastic theory.
