earticle

영어

Much of the previous research has concentrated on developing new strengthening material system to strengthen the deteriorated reinforced concrete structures. Worldwide ageing infrastructure has arrested the interest of many researchers and organisations to find alternative materials and techniques to restore deteriorating and deficient structures. Advanced composites have received great attention as materials for choice for a variety of applications in repair and strengthening projects. In order to examine the effects of Glass fiber-Steel plate composite Plate on shear capacity of strengthened beam, systematic experimental investigations were performed for 3 control and 20 strengthened beams. The experimental results showed that strengthened beams with Glass fiber-Steel plate composite Plate considerably increased in shear capacity compared with the control ones. Main parameters considered were concrete strength, the internal shear reinforcement ratio, and Glass fiber-Steel plate composite Plate's amount, thickness, depth ratio, and yield strength. A formula to compute the shear strength of strengthened beams with Glass fiber-Steel plate composite Plate was proposed by adding up the concrete strength, shear reinforcement and the Glass fiber-Steel plate composite Plate contribution. The validity of proposed formula was checked against the results from parametric study and experiments. It was found that the proposed formula predicts the ultimate shear strength of beams strengthened with web-bonded Glass fiber-Steel plate composite Plate.

한국어

본 연구에서는 기존의 보강공법의 단점들을 보완하며, 장점을 최대한으로 이용할 수 있는 신소재를 사용하여 RC보의 전단보강에 관한 실험을 하였다. 본 연구에서 사용되는 신소재는 강성이 뛰어난 유리섬유를 연성능력이 좋은 얇은 강판에 함침 시켜 만든 유리섬유-강판 복합재료(Glass fiber-Steel composite Plate:이하 GSP)이다. GSP는 앵커를 사용하여 콘크리트에 완전 부착시키는 공법이므로 조기탈락 방지에 효과적이며, 얇은 강판은 큰 하중으로 인한 보강재 슬립현상 때문에 앵커가장자리의 유리섬유 찢어짐을 방지하는 효과가 있다. 따라서 본 연구에서는 GSP로 전단보강한 철근콘크리트 보의 전단파괴실험을 수행하고, 분석된 실험결과를 바탕으로 GSP로 보강된 RC보의 전단강도 추정식을 제안하였다. 제안식으로부터 구한 값과 실험값의 비교를 통해 본 연구에서 제안한 추정식의 타당성을 입증하였다.