Proceedings of the Korea Concrete Institute Conference (한국콘크리트학회:학술대회논문집)
- 2008.04a
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- Pages.325-328
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- 2008
An Experimental Study on the Long-Term Deflection of Concrete Beams with GFRP Rebars
FRP 보강 콘크리트 보의 장기처짐에 관한 실험연구
Abstract
This study is to investigate experimentally the long-term deflection of concrete beams with glass fiber reinforced polymer (GFRP) reinforcing bars subjected to the sustained flexural load for periods of up to 6 months. A total of four beams were tested. All beams were designed with net span of 2,700 mm and rectangular cross-section of 200 mm width and 300 mm depth. From the test results the time-dependent deflection of concrete beams with GFRP bars was about 40 to 70% of the initial deflection. As well as this paper compares the long-term deflection calculated by 440.1R-06 design guide and that of tested beams. The comparison indicated that the calculated long-term deflection overestimate the observed long-term deflection of concrete beams with FRP rebars.
FRP 보강근을 이용한 콘크리트 부재는 균열이 발생하면 강성이 상대적으로 작아지고 이와 같은 부재의 낮은 강성은 사용하중 상태에서 허용처짐량이나 균열폭 등과 같은 사용성이 부재의 설계를 결정하게 되는 주요 요인으로 작용하게 된다
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