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쉴드 터널용 프리캐스트 세그먼트 콘크리트 라이닝의 내화성능
한병찬,하라다카즈노리,권영진,김윤용,Han, Byung-Chan,Harada, kazunori,Kwon, Young-Jin,Kim, Yun Yong 대한토목학회 2014 대한토목학회논문집 Vol.34 No.1
철근콘크리트 쉴드 터널 라이닝은 대형화재 등과 같은 고온에 노출될 경우, 구조체에의 급격한 온도 전달 및 내하력 저하로 구조체 붕괴의 원인이 될 수 있기 때문에 내화성능을 확보해야 한다. 이 연구는 쉴드터널의 프리캐스트 RC 세그먼트 라이닝에 대한 내화성능을 평가하고자 실험/해석적 연구를 수행하였다. 실험적 연구에서는 프리캐스트 RC 세그먼트내의 열적 취약부위를 실험변수로 하여 6개의 실 대형 실험체에 대한 내화실험을 실시하였으며, 화재조건은 RABT 곡선에 의한 온도이력을 이용하였다. 내화실험결과 이 연구에서 제시된 쉴드형 터널의 PP섬유 혼입콘크리트 충전부위는 폭렬이 발생하지 않는 우수한 내화성능을 나타내었다. 해석적 연구에서는 온도의존성을 고려한 재료의 열특성을 고려하여 비정상 유한요소 온도분포해석 기법을 이용하였는데, 실험결과를 잘 모사하는 것으로 검증되었다. Reinforced concrete (RC) shield tunnel lining must be designed for fireproof performance because the lining is sometimes exposed to very high temperature due to traffic accidents. Both experimental and numerical studies are carried out to evaluate fire resistance performance of precast RC tunnel lining systems. In the experimental studies, six full-scale precast RC tunnel segments are exposed to fire in order to examine the influence of various parameters on the fire resistance performance of precast RC tunnel lining. We used the temperature curve of the RABT criteria, which are severe conditions of fire temperatures. The fire test showed that the explosive spalling was not observed by substituting concrete to PP fiber reinforced concrete. A transient heat flow analysis was carried out in consideration of the material properties that change with temperature, and the results showed good agreement with the test results.
결손된 전단부위를 숏크리트로 충전한 철근콘크리트 보의 전단거동에 관한 실험적 연구
한병찬 ( Han Byung-chan ),최창식 ( Choi Chang-sik ),윤현도 ( Yun Hyun-do ),정수영 ( Chung Soo-young ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
This paper concentrates on the most common repair technique in which in the course of applying the repair materials, the cover and steel/concrete bond over shear regions of the damaged RC elements is in-filled by shotcrete prior to the application of the strengthening the repair materials. This research work addresses two major concerns. The first is to examine the effectiveness of in-filled shotcrete in shear regions with different patterns of replacing damaged RC beams. The second is to study the validity of the currently used recommendations for shear design of shotcrete-repaired beams, tight beams were tested to determine their diagonal cracking and ultimate shear capacities. The variables in the test program were the extent of removal of steel/concrete bond; the compressive strength of concrete; the percentage of the shear reinforcement. Two of the beams were unrepaired original beams, Three beams were repaired by removing the cover concrete to 50mm, and the last three were repaired by removing the bottom layer to a depth equal to 100mm. The repaired beams were compared to the original beams with respect to cracking, deflection, ultimate strength, shear deformation, and mode of failure. Test results show that the most significant strength loss occurred in the cases where there was no shear reinforcement. However, inn the case of all specimens with web reinforcement, the reduction in the strength of the repaired beams was not affect in either 50mm or 100mm layer repaired specimens.