DPT 실험을 이용한 고온노출된 강섬유보강콘크리트의 인장강도 평가

Do-Young Moon; Soo-Ho Chang; Gyu-Jin Bae; Gyu-Pil Lee; Hee-Sung Kim

doi:10.9711/KTAJ.2013.15.1.001

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2013 Vol.15, Issue 1 Next Page

DPT 실험을 이용한 고온노출된 강섬유보강콘크리트의 인장강도 평가

31 January 2013. pp. 1-11

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Abstract

강섬유 보강콘크리트는 NATM 터널의 숏크리트와 세그먼트 등 라이닝에 주로 적용된다. 터널화재시 라이닝은 화재에 직접적으로 노출되기 때문에 고온노출시 SFRC의 성능변화는 매우 중요하다. 본 연구에서는 고온에 노출된 강섬유보강콘크리트의 인장성능을 DPT 실험을 통하여 검토하였다. 고온 노출온도, 강섬유 혼입률 및 종류가 파괴형태, DPT 인장강도, 실험의 변동계수에 미치는 영향을 분석하였다. 실험결과, 강섬유 보강으로 인한 잔존인장강도의 증가를 확인하였으며, 혼입률이 증가할수록 효과적임을 확인하였다. 그러나, DPT 인장강도는 고온노출로 인한 파괴면의 변화를 고려할 수 없기 때문에 파괴에너지의 고찰이 필요한 것으로 판단된다.

Steel fiber-reinforced concrete (SFRC) is widely used for tunnel lining structure such as shot-crete in NATM tunnel and segment in TBM tunnel. In tunnel fire accidents, structural performance of a lining is very important because the lining is the structure that directly exposed to fire. In this study, the effects of high temperatures, mix ratios and types on failure pattern, DPT tensile strength and coefficient of variation were investigated through Double Punch Tests (DPT) of SFRC subjected to high temperatures. In the results, it is confirmed that the residual DPT tensile strength increases as for SFRC and this is more in SFRC with higher mix ratio. But, the equation for evaluation of DPT tensile strength does not involve the number of failure surfaces SFRC specimens subjected to high temperatures, therefore, it is required to investigate more fracture energy in DPT tests.

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Information

Publisher :Korean Tunneling and Underground Space Association
Publisher(Ko) :한국터널지하공간학회
Journal Title :Journal of Korean Tunnelling and Underground Space Association
Journal Title(Ko) :한국터널지하공간학회 논문집
Volume : 15
No :1
Pages :1-11
DOI :https://doi.org/10.9711/KTAJ.2013.15.1.001

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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