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Title |
Experimental Study on Blast Resistance Improvement of RC Panels by FRP Retrofitting
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Authors |
하주형 ; 이나현 ; 김성배 ; 최종권 ; 김장호 |
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Keywords |
폭발 ; 이격거리 ; CFRP ; BFRP ; 폴리우레아 blast ; standoff distance ; CFRP ; BFRP ; Poly-urea |
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Abstract |
Recently, FRP usage for strengthening RC structures in civil engineering has been increasing. Especially, the use of FRP to strengthen structures against blast loading is growing rapidly. To estimate FRP retrofitting effect under blast loading, blast tests with nine 1,000 × 1,000 × 150 mm RC panel specimens, which were retrofitted with carbon fiber reinforced polymer (CFRP), Polyurea, CFRP with Poly-urea and basalt fiber reinforced polymer (BFRP) have been carried out. The applied blast load was generated by the detonation of 15.88 kg ANFO explosive charge at 1.5 m standoff distance. The data acquisitions not only included blast waves of incident pressure, reflected pressure, and impulse, but also included central deflection and strains at steel, concrete, and FRP surfaces. The failure mode of each specimen was observed and compared with a control specimen. From the test results, the blast resistance of each retrofit material was determined. The test results of each retrofit material will provide the basic information for preliminary selection of retrofit material to achieve the target retrofit performance and protection level.
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