Abstract
According to some reports of seismic evaluations of existing reinforced concrete buildings, the presence of RC buildings with low strength concrete has been confirmed. To evaluate residual seismic performance of those RC buildings accurately, it is necessary to clarify the ultimate strength and the restoring force characteristics of low strength concrete members. In this study, half-scale three column specimens with low strength concrete and plain bars were tested until they came up to ultimate collapse. Based on resistance mechanism of RC columns without bond, it was proposed to formulate the flexural strength, the shear strength and the restoring force characteristics up to ultimate collapse of low strength concrete columns. The restoring force characteristics of low strength concrete columns calculated by the proposed method showed a good agreement with experimental results.
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