Research for Development of Energy Dissipating Precast Reinforced Concrete Building

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Flexural restoring force characteristics of reinforced concrete section was analyzed. At the yelding of a section, the shape of compressive stress block depended on stiffness of concrete and no influence of concrete strength was observed on the shape. Curvature of a section at the yielding wassignificantly affected by material prperties of concrete.Deformation capacity of beams was studied xeperimentally. Ductility of beams with normal strength concrete and reinforcement was larger than that estimated by AIJ Desgn Guideline based on Ultimate Strength Concept. The minimum amount of stirrups provided in the Guideline was insufficient for beams withhih strength materals to prevent brittle failure.Experimental results of interior beam-column joint with high strength concrete indicated that the panel with insufficient shear capacity fails in shear after beam yielding due to bond deterioration along beam reinforcement in the center part of the panel. The energy dissipation of a joint was larger than that with the same beam reinforcement ratio and the higher yield strength of the reinforcement. In case of bond index of beam main reinforcement lower than 0.22, good performance in load-deformation characteristics was obtained.Effect of hysteresis rules of beam on the earthquake response of reinforced concrete frame structure was investigated by nonlinear dynamic earthquake resonse analysis. No large differences in the maximum response ductility of beams and the maximum respnse drift of frame were observed between the two cases with Takeda model and with Takeda-slip model.