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접착재 종류와 정착구 유무에 따른 탄소막대 매립보강 RC보의 휨 거동에 관한 실험적 연구
김성원,이형근,여환준,박성무 한국공간구조학회 2014 한국공간구조학회지 Vol.14 No.4
For the last decade many bridges and buildings have experienced flexural strengthening with the fiber reinforced polymer(FRP) bonding system, demands for increasing heavy traffic loads and the changing of the code application. Of the many strengthening systems, NSM(near surface mounted) system with FRP has become attractive and popular way of strengthening for the existed RC structures and many studies and applications of this technique have significantly increased all over the world. Meanwhile, polymer mortar that contains much of the same ingredients as cement but includes the addition of certain polymer resins for enhancing desired physical properties, has been used as an alternative adhesive. This paper focuses on flexural behaviour of CFRP-bar NSM system with variables such as kinds of adhesive, anchorage, sectional aspect ratio. Based on the test results and test-to -predicted ratio, this paper provides researchers and practical engineers a fundamental knowledge and intuition.
CFRP-bar NSM 시스템의 부착거동에 관한 실험적 연구
김성원,김현호,여환준,박성무 대한건축학회지회연합회 2014 대한건축학회연합논문집 Vol.16 No.6
구조물보강에서 전세계적으로 주목받고 있는 NSM시스템은 기존의 콘크리트 구조체에 매립 홈을 형성하고, FRP 보강재를 접착재로 충진하여 일체성확보와 아울러 보강성능을 발현하고자 하는 공법이다. 부착강도예측을 위해 현재까지 전 세계적으로 많은 연구자들이 실험적으로 부착강도모델을 제시하고 있으나 파괴모델에 근거한 제한적 강도모델을 제시하는 경우가 일반적이다. 따라서, 본 연구는 CFRP-bar NSM 시스템의 부착거동에 대한 실험결과를 정량적으로 평가하고, 영향변수별 기여도에 근거하여 부착파괴를 포괄하는 범용적 부착강도모델을 제안하며, 선행연구에 근거하여 제안된 유효부착길이 실험결과를 토대로 종국적으로 최소보강길이에 개념에 대한 유효부착길이의 타당성을 실험적으로 검증하고자 한다. Of the many strengthening systems, NSM(near surface mounted) system with FRP bar has become attractive and popular way of strengthening for the existed RC structures. To effectively apply this method, bond characteristics at the interface need to be fully understood. This paper presents the results of an experimental program to investigate the bond behaviour of CFRP- bar NSM system for strengthening RC beams. The overall experimental program consisted of 16 pull-push tests RC specimens with CFRP-bar NSM system for variables such as strengthening length, sectional aspect ratio of CFRP-bars and grooves, adhesives. The performance of each NSM strengthened beams is presented, discussed, and compared in terms of failure mode, ultimate load, load-slip relationship, and test-to-predicted ratio. Based on the test results, this paper provides researchers and practical engineers a fundamental knowledge and intuition about the bond behaviour of CFRP-bar NSM system.
접착재 종류와 정착구 유무에 따른 탄소막대 매립보강 RC보의 휨 거동에 관한 실험적 연구
김성원,이형근,여환준,박성무,Kim, Sung-Won,Lee, Hyung-Geun,Yeo, Hwan-Jun,Park, Sung-Moo 한국공간구조학회 2014 한국공간구조학회지 Vol.14 No.4
For the last decade many bridges and buildings have experienced flexural strengthening with the fiber reinforced polymer(FRP) bonding system, demands for increasing heavy traffic loads and the changing of the code application. Of the many strengthening systems, NSM(near surface mounted) system with FRP has become attractive and popular way of strengthening for the existed RC structures and many studies and applications of this technique have significantly increased all over the world. Meanwhile, polymer mortar that contains much of the same ingredients as cement but includes the addition of certain polymer resins for enhancing desired physical properties, has been used as an alternative adhesive. This paper focuses on flexural behaviour of CFRP-bar NSM system with variables such as kinds of adhesive, anchorage, sectional aspect ratio. Based on the test results and test-to-predicted ratio, this paper provides researchers and practical engineers a fundamental knowledge and intuition.