鋼繊維と横補強筋を併用したコンクリートの圧縮塑性変形挙動

Abstract

The high rotation capacities are required for reinforced concrete members to secure the seismic safety of reinforced concrete structures against such a large earthquake motion as in Japan. It is well known that their plastic rotation capacities are closely related to the stress-strain behavior of concrete under compression. This paper describes the complete stress-strain behavior of steel fiber reinforced concrete confined with lateral reinforcement (confined SFRC). Prismatic column specimens are uniaxially loaded in a new type of high rigidity compression testing machine. The stress-strain curves of confind SFRC up to a large plastic strain are measured, and the effects of the volume fraction of steel fiber, the spacing and the yield strength of lateral reinforcement, the casting direction of concrete and the watercement ratio on stress-strain relationship are examined in detail.