GFRP DSCT 보의 휨거동 특성에 관한 실험적 연구 KCI

GFRP DSCT 보의 휨거동 특성에 관한 실험적 연구
Alternative Title
Experimental Study on the Bending Behavior of GFRP DSCT Beam
홍혜민; 김성원; 김정중; 한택희
KIOST Author(s)
Kim, Sungwon(김성원)Han, Taek Hee(한택희)
Publication Year
본 연구에서는 Glass Fiber Reinforced Polymer Double-Skinned Composite Tubular (GFRP DSCT) 보의 성능을 실험적으로 확인하고 실제 구조물에의 적용 가능성을 살펴보았다. 거동 실험 결과를 기존 연구에서 유사제원을 갖는 Internally Confined Hollow Reinforced Concrete (ICH RC) 보의 성능시험결과와 비교하여 GFRP DSCT 보의 성능 수준을 확인하였다. 4점 재하실험을 수행하여 보의 휨거동 특성을 분석하였으며, KS F 4306에 나타나있는 휨 강도 시험방법을 참고하였다. 실험은 시험체의 중앙부에 순수휨모멘트가 작용하도록 가력하여 Drift ratio를 증가시키는 변위제어방법으로 진행하였다. 실험 결과는 하중, 변위, 소산에너지, 연성도 등으로 나타내었으며, GFRP DSCT 보 시험체 실험 결과, 하중-변위 포락곡선을 통해 약 980.0 kN의 하중이 가력된 이후에 곡선의 기울기가 980.0kN의 하중이 가력되기 이전보다 확연히 감소하는 것을 확인하였다. 최대 변위 및 최대 하중은 각각 145.0 mm, 1,303.4 kN으로 나타났다. GFRP DSCT 보 시험체의 항복강도 및 극한강도는 기존의 ICH RC 보 시험체 대비 각각 123.3%, 125.9%로 높게 발생하였으며, 본 실험을 통하여 GFRP DSCT 보의 실제 구조물 적용 가능성을 확인하였다.

This study conducts a bending test of a glass fiber reinforced polymer double-skinned composite tubular (GFRP DSCT) beam, and the applicability of the beam to an actual submerged floating structure was examined. The result of the bending test was compared with the result of a previous test assessing the bending performance of an internally confined hollow reinforced concrete (ICH RC) beam with similar dimensions. Additionally, a four-point loading test was conducted to evaluate the behavior of the GFRP DSCT beam. The test method followed standard KS F 4306, and the load was applied by increasing the drift ratio to produce a pure moment acting in the middle of the specimen. As a result of the test, a load-displacement envelope curve was produced, and load, displacement, dissipation energy, and ductility were calculated. The slope of the curve became gradual after the load reached approximately 980.0 kN, which means that the stiffness of the specimen evidently decreased with increase in displacement. The maximum displacement and load of the GFRP DSCT beam specimen were measured as 145.0 mm and 1,303.4 kN, respectively. The yield strength and ultimate strength of the GFRP DSCT beam were higher at 123.3% and 125.9% compared with the ICH RC beam, which means that the GFRP DSCT beam can be adopted as a main member of a civil structure.
Bibliographic Citation
한국방재학회논문집, v.19, no.5, pp.167 - 175, 2019
GFRP; DSCT; Composite Material; Submerged Floating Tunnel; Beam; 유리섬유; 이중관; 복합재료; 해중터널; 보
Related Researcher
Research Interests

Ocean Engineering,Structural Engineering,Renewable Energy,해양공학,구조공학,신재생에너지

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