Development of R/C structures with columns an shear walls using un-bonded reinforcing bars

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The aim of this study is to develop the reinforced concrete buildings whose residual lateral drift was decreased after severe earthquake excitation by using the R/C columns with un-bonded high strength longitudinal reinforcing bars. Also, this study intend to improve the lateral drift capacity of framed shear walls failed in flexure by using the un-bonded longitudinal reinforcing bars in their edge columns. The followings were concluded.(1)Relation between the experienced lateral drift angle, Ro, and the residual one, Rr, on the R/C columns failed in flexureThe relation between Ro and Rr was obtained by the experimental data mentioned in the technical papers of AIJ annual meeting printed in 1993-1993. The residual lateral drift increased gradually at the stage where the experienced lateral drift was over 1%.(2)Hysteresis response of R/C columns with un-bonded longitudinal reinforcing barsThe increase of the residual lateral drift of the columns with un-bonded high strength bars was less than that of the columns with bonded normal ones under the large drift. The self-centering hysteresis response was observed in the specimens with the un-bonded longitudinal reinforcing bars. The residual lateral drift of columns with un-bonded bars was small at the stage where the experienced lateral drift angle was 3%.(3)Hysteresis response of R/C framed shear walls with their edge columns reinforced by un-bonded longitudinal reinforcing barsThe lateral drift capacity of shear walls was improved by using the un-bonded longitudinal reinforcing bars. The end of edge column in the compression side required the confinement bars in order to improve more the deformation capacity.(4)Hysteresis response of cross type sub-assemblage frame with the column reinforced by the un-bonded barsThe residual drift of the frame was larger than that of the columns because the plastic deformation of the beam-column joint and the beams occurred.