Abstract
Authors proposed a seismic retrofi tting technique for existing RC columns with cast-in-place RC sidewall using polymer-cement mortar (PCM). In the technique, additional shear reinforcement (hoops of column and/or horizontal shear reinforcement of sidewall; prefabricated reinforcing unit) is adhered to the surfaces of existing RC columns with RC sidewall by applying PCM. The strengthened area (additional reinforcement and PCM) and existing member are strongly joined by the high adhesive strength of the PCM. The design / construction guideline of this seismic retrofi t technique obtained the technology assessment of the Japan Building Disaster Prevention Association. The present paper introduces the eff ect of this seismic technique and the outline of the guideline.
