Abstract
A bar elastically restrained at both ends against rotation was analyzed based on differencial equation for the elastic bending of axially loaded member and commonly adopted yield conditions. The analytical results were compared with experimental results shown in ref. 11). Furthermore, cyclic behavior of a restrained bar was compared with one of a pin supported bar at both ends having the same slenderness ratio as the restrained bar. And the effects of the eccentricity of axial load on the behavior of a bar were investigated. Analytical results are as follows. 1) The analytical cyclic behavior fairly well predicted the experimental behavior, expect for the maximum compression load at each loading cycle and the initial maximum tensial load of a pin supported bar subjected to eccentrical load. 2) In the elastic-plastic region of the axial load displacement curves, the change of stiffness of a restrained bar was less than one of a pin supported bar having the same slenderness ratio as a restrained bar, especially, deterioration after the maximum compression load of a restrained bar at each loading cycle was less than one of a pin supported bar. 3) Under identical stiffness of restraining, spring, close agreement between analytical and experimental values of magnification a for load carrying capacity at the reversed points was obtained. 4) The effect of the eccentricity of axial load on the cyclic behavior of a restrained bar was very large in the elastic-plastic region of the axial load-displacement curves.
