EVALUATION OF SHEAR STRENGTH FOR LOW STRENGTH CONCRETE MEMBERS

It is often reported that the strength of the concrete cores from the existing reinforced concrete (RC) buildings were less than half of design concrete strength in the seismic evaluations. Those low strength concrete were also lower than the applicable lower limit of 13.5MPa in the Standard for Seismic Evaluation of Existing Reinforced Concrete Building in Japan. Though it is necessary to continue to use the existing buildings provided some retrofitting, the evaluation method for the low strength concrete have not been established clearly. In this research program the experimental investigation were performed to clarify the seismic performance of the RC member with low strength concrete.