Seismic Retrofit of Rectangular RC Columns Using CFRP Wrapping and CFRP Anchors

• Main Authors: Ying-Han Wu, 吳穎涵
• Other Authors: Chih-Tsung Lin
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/7hnd58

碩士 === 國立臺北科技大學 === 土木與防災研究所 === 96 === External confinement by the wrapping of CFRP sheets (or CFRP jacketing) provides a very effective method for the retrofit of reinforced concrete (RC) columns subject to either static or seismic loads. Research result showed that retrofitting of rectangular columns by CFRP wrapping was ineffective because of crushed column concrete cause of bulging of column sides, thus, this study propose “CFRP wrapping conjugate CFRP anchors” rehabilitate method. The objective of this study was to research, develop the CFRP Anchor and to evaluate the efficacy of seismic retrofit of rectangular columns by CFRP wrapping and CFRP Anchors. Five specimens of retangular reinforced concrete columns were tested by cyclic lateral force under reversed bending and constant axial load (0.2f’cAg.). Two different techniques of using CFRP wrapping and CFRP Anchors to improve concrete confinement, shear strength and moment strength in these specimens. These specimens were divided into two groups. Two specimens of group 1 were retrofitted shear strength and ductility by CFRP wrapping and CFRP anchors and two specimens of group2 were retrofitted moment strength by longitudinal CFRP sheets and CFRP anchors and shear strength, ductility by CFRP wrapping. From test result of group 1, the behavior and effectiveness indicated that comparing with test conducted on the specomen wrapping by CFRP without anchor, anchoring techniques used were effective in improving the column confinement and in increasing the ability of energy disspation. From test result of group 2, the initial elastic modulus increase cause of logngitudinal CFRP sheets linked the foundation by CFRP anchor. But it’s failure in linking mechanism of CFRP anchors by low cycle fatigue to do justice to moment strength. The research and develop of CFRP anhor in this study of it’s used methods and theorem in rehabilation had reinforcement effect.The study of CFRP anchor is referable for seismic retrofit engineerings.