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Experimental Investigation on Seismic Retrofitting of Square RC Columns by Carbon FRP Sheet Confinement Combined with Transverse Short Glass FRP Bars in Bored Holes |
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| Authors: | Yu-Fei Wu Tao Liu Leiming Wang |
| Affiliation: | 1Assistant Professor, Dept. of Building and Construction, City Univ. of Hong Kong, Hong Kong (corresponding author). E-mail: yfwu00@cityu.edu.hk 2Lecturer, Dept. of Civil Engineering, Shanghai Univ., P. R. China. 3Research Student, Dept. of Building and Construction, City Univ. of Hong Kong, Hong Kong. |
| Abstract: | Jacketing is less effective to large square/rectangular RC columns due to the inability of the rectangular-shaped jacket in restraining the dilation of concrete in the middle of a straight side. A new retrofit method is proposed in this work by fiber reinforcing the surface concrete in the middle of a straight side. Fiber reinforcing is achieved by inserting small fiber-reinforced polymer (FRP) bars into the concrete in the plastic hinge zone. The inserted FRP bars act as horizontal reinforcement to increase the ductility of the concrete in a similar way as that in normal fiber-reinforced concrete. When this fiber reinforcing technique is combined with the conventional jacketing, the concrete in all parts of a cross section may be effectively confined. In this work, experimental tests were undertaken to investigate the effectiveness of this new retrofit technique. Six half-scaled columns were tested and the test results demonstrated the effectiveness of the method. |
| Keywords: | Seismic effects Rehabilitation Concrete, reinforced Concrete columns Ductility Fiber reinforced polymers Holes |