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Journal of the Korean Society of Hazard Mitigation 2011;11(6):83-90.
Published online December 31, 2011.
고온에 노출된 탄소섬유보강근의 계면전단강도 및 휨강도
문도영
Inter-laminar Shear and Flexural Strength of CFRP Rebar Subjected to Elevated Temperatures
Do-Young Moon
Abstract
In this experimental study, a reduction in mechanical properties of CFRP reinforcing bars, which is domestically produced, subjected to elevated temperatures was investigated. The inter-laminar shear and flexural tests were conducted on the rebar specimens conditioned in a chamber for specified times at high temperatures. The rebar specimens were exposed to the temperatures, range $100^{circ}C{sim}400^{circ}C$, for 0.5 hr~4 hr. Based on the obtained results, linear equations were presented for evaluation of the reduced properties due to the applied conditions. It is predicted that the critical temperature and exposure time were $250^{circ}C$ and 2.5 hr, respectively.
Key Words: High temperature; exposure time Inter-laminar shear strength; Flexural strength; CFRP rebar
요지
본 연구에서는 국내에서 생산된 탄소섬유보강근의 고온하에서의 성능변화를 실험적으로 고찰하였다. 실험에서 고온전기로에서 일정시간동안 고온에 노출된 탄소섬유보강근 실험편의 계면전당강도 및 강성, 휨강도 및 강성을 고찰하였다. 실험편의 노출온도 범위는 $100^{circ}C{sim}400^{circ}C$, 노출시간은 0.5시간~4시간으로 하였다. 실험결과를 통해 노출온도와 노출시간을 고려한 간단한 평가식을 제안하였으며, 이를 이용하여 임계노출온도와 임계노출시간을 평가한 결과, $250^{circ}C$와 약 2.5시간인 것으로 나타났다.
핵심용어: 고온; 노출시간; 계면전단강도; 휨강도; CFRP 보강근


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