유사동적실험에 의한 기존 R/C 건축물의 프리스트레싱 철골프레임 보강공법의 내진보강효과

Abstract

This research proposed a seismic strengthening technique of Pre-stressing Steel Frame methodology (PSF) for existing R/C buildings in order to enhance the connection performance and constructability. The PSF system, proposed in this study, is a type of strength-enhancing reinforcement systems to easily increase the ultimate horizontal shear capacity of R/C structures without seismic details. The PSF method increased the seismic reinforcement effect and constructability by separating the reinforcement H-frames into two parts for improving the integration of connections between the existing R/C frame and the strengthening member by using pre-stressing technique. Two test specimens of full-size two-story R/C frames were fabricated based on an existing domestic R/C building without seismic details, and then retrofitted by using the proposed PSF seismic system. Pseudo-dynamic testing was conducted to evaluate seismic rehabilitation effects, and the seismic response characteristics of the proposed system, in terms of the maximum shear force, response story drift, and seismic damage degree compared to the control specimen without strengthening frame. Test results revealed that the proposed PSF reinforcement system effectively enhanced the horizontal shear force, resulting in reduced story drift of R/C buildings under the maximum design earthquake level designated in KDS 41.