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K-UHPC 교량의 긴장재 부식에 관한 신뢰성 기반 성능 평가 및 예측
권기현 ( Kihyon Kwon ),박성용 ( Sung Yong Park ),조근희 ( Keunhee Cho ),김성태 ( Sung Tae Kim ),박종범 ( Jong Beom Park ),김병석 ( Byung Suk Kim ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.3
Tendon corrosion reliability in KICT-ultra high performance concrete (K-UHPC) bridges is assessed and predicted considering uncertainties in flexural bending capacity and corrosion occurrence. In post-tensioning bridge systems, corrosion is a one of most critical failure mechanisms due to strength reduction by it. During the entire service life, those bridges may experience lifetime corrosion deterioration initiated and propagated in tendons which are embedded not only in normal concrete but also in K-UHPC. For this reason, the time-variant corrosion performance has to be assessed. In the absence of in-depth researches associated with K-UHPC tendon corrosion, a reliability-based prediction model is developed to evaluate lifetime corrosion performance of tendon in K-UHPC bridges. In 2015, KICT built a K-UHPC pilot bridge at 168/5~168/6 milestone on Yangon-Mandalay Expressway in Myanmar, by using locally produced tendons which post-tensioned in longitudinal and lateral ways of K-UHPC girders. For an illustrative purpose, this K-UHPC bridge is used to identify the time-variant corrosion performance.