Abstract
In part 1 and 2 of this serial paper, we described the experimental results of the scaled models of multi-story, multi-span reinforced concrete frame under monotonic loading in consideration of the effect of axial elongation in bending yield beams. In this study, a cyclic loading experiment of four-story three-span reinforced concrete frame is performed to consider the effect of axial restriction of beam deformation. Finite segment method for the reinforced concrete frame with consideration of axial and bending deformations of beames and columns, shear deformations of beam-column joints and bond-slip effect of steel bars in concrete is used for analyzing the mechanical behaviors of the specimen. Main conclusions are: 1. Horizontal resistance force of this structure increases, because axial restriction imposed by the horizontal stiffness of columns causes the beam bending strength to increase. 2. When a reinforced concrete frame is subjected to loading in the right direction, the elongation of the beam in right span is larger. And loading in the left direction, the elongation of the beam in left span is larger. Then the elongation of the beam in center span is smaller than that of the beams in both-end span. 3. The Ibad deflection relationships obtained from the analysis are almost coincident with the experimental results. The analytical results provided us more detailed information such as bending moments, shear forces of all members.
