2014 Volume 52 Issue 2 Pages 151-156
Seismic evaluations of existing RC buildings have been extensive in Japan since the earthquake of 1995. According to some reports, seismic evaluations found many RC buildings of very low concrete strength, i.e. less than half of the design concrete strength. It is necessary for evaluation and retrofitting to clarify the mechanical characteristics of low strength concrete and seismic performance of low strength concrete members and frames. This report presents the results obtained from experimental studies on low strength concrete. In conclusion, the importance of investigating the characteristics of existing buildings before retrofitting them needs to be emphasized and made a standard practice.
