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CFRP 스트립으로 표면매립 휨 보강된 RC보의 수치해석
한상훈 ( Sang Hoon Han ),홍기남 ( Ki Nam Hong ),정규산 ( Kyu San Jung ),이병로 ( Byung Ro Lee ),권용길 ( Young Gil Kwon ) 한국안전학회(구 한국산업안전학회) 2013 한국안전학회지 Vol.28 No.7
Experiment and Numerical Analyses were performed in this study to assess the flexural strengthening capacity of reinforced concrete(RC) members strengthened by near surface mounted(NSM) technique, which is drawing attention as an alternative to the cabon fiber reinforced polymer(CERP) bonding strengthening technique. The variables such as tensile reinforcing bar ratio (0.4%, 0.68%, 0.98% and 1.42%) and a number of CFRP strips (one line, two lines and three lines) were considered. Through the testing scenarios, the effect of each test variable on the failure mode and the flexural strengthening capacity of the RC beams strengthened by the NSM technique were assessed. Compared test results with analysis results. Ls-Dyna, Rigid-body-spring-network(RBSN) and Opensees were used for analyses. Test results show that the RC beams strengthened by the NSM technique go to failure as a result of the partial CFRP fracture accompanied by crushing of the concrete in the compression zone and that the CFRP reinforcement area as well as the section geometry have the greatest effect on the strengthening capacity. The numerical analysis methods proposed in this study appropriately predict the flexural strength and the load-displacement response of the RC members strengthened the NSM technique, respectively.