| 抄録（英）： |
Seismic retrofitting of existing RC columns has been in progress in Japan, with steel jacket methods being the most commonly adopted. However, such methods are not applicable where space under RC viaducts is in use by stores and offices. The authors have developed a new seismic retrofitting method which is easily implemented in these cases. In this paper, it is proved that this new method of external lateral reinforcement
does not suffer yielding when a gap is left between the reinforcement and the column surface or when the shear-to-flexural-capacity ratio (Vyd/Vmu) is over 2.3. It is also proved that, using this new method, equivalent or better flexural capacity can be obtained with less lateral reinforcement compared to RC columns with normal hoop reinforcement.
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