種々の方法で耐震補強された低強度コンクリートRC柱の補強効果に関する研究

抄録

This paper present and discusses experimental results on the seismic performance retrofitted low concrete strength R/C column. In order to investigate this objective and to evaluate ultimate shear strength, test results of 9 columns retrofitted by various methods were examined under cyclic lateral loads. The main finding is that, those columns retrofitted with steel plate only and steel plate as well as aramid fiber sheets were superior in seismic performance. On the other hand, when shear capacity of existing low strength concrete R/C column is evaluated, it is necessary to consider not only current design in seismic assessments but also design equation for the bond splitting strength. In addition, seismic retrofitted R/C columns could be evaluated by using the compressive strength of concrete in consideration of confinement effect. It was clarified that the calculated values using the above formula agreed well with experimental results for shear capacity and failure modes.