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강균희(Gyun-Hee Kang),하동명(Dong-Myeong Ha) 한국위험물학회 2017 한국위험물학회지 Vol.5 No.1
In order to reduce the accidents in chemical processes, working places and laboratories, it is important to understand the information of on the materials handled in work places. The flash point, fire point, explosion(flammable) limit and autoignition temperature(AIT) are crucial the combustible parameters which need special attention in chemical plants and processes that handle hazardous substances. For the safe handling of isobutylbenzene(IBB) being widely used the chemical industry, the flash point, the fire point and the AIT of isobutylbenzene was experimented. And, the lower explosion limit of isobutylbenzene was calculated by using the lower flash point which obtained in the experiment. The flash points of isobutylbenzene by using the Setaflash and Pensky-Martens closed-cup testers measured 45℃ and 48℃ , respectively. The flash points of isobutylbenzene by using the Tag and Cleveland open cup testers are measured 54℃ and 58℃ . Also, the fire points of isobutylbenzene by the Tag and Cleveland open cup testers are measured 61℃ and 60℃ . The AIT of isobutylbenzene by ASTM 659E tester was measured as 424℃ . The lower explosion limit by the measured lower flash point of isobutylbenzene 45℃ was calculated as 0.84 vol%. In this study, the prediction of explosion limit is possible by using the flash point measured.
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Perfobond rib 전단연결재의 전단강도 및 잔류강도 평가
안진희(Ahn Jin Hee),김상효(Kim Sang Hyo),구현본(Koo Hyun-Bon),강균희(Kang Gyun Hee) 대한토목학회 2007 대한토목학회논문집 A Vol.27 No.2A
본 논문에서는 실험적 연구를 통해 perfobond 전단연결재의 전단거동 특성과 피로하중에 따른 잔류강도 변화를 평가하였다. 이를 위해 총 18개의 perfobond 전단연결재 시험체를 제작하였으며, 이들 시험체에 대한 정적 및 피로 직접전단실험을 실시하여 홀 관통철근콘크리트 다웰효과반복하중 작용 등이 전단강도에 미치는 영향을 분석하였다. 실험결과, perfobond 전단연결재의 전단강도에서 콘크리트 다웰효과는 최대전단강도의 약 65%를 차지하고, perfobond 전단연결재 홀에 배치된 관통철근은 전단강도를 100% 이상 증가시키는 것으로 나타났다. 특히, 홀 관통철근은 전단연결부 파괴시 하중-슬립 거동의 연성을 현저히 향상시키는 것으로 나타났다. 두 종류의 피로하중(도로교설계기준에 명시된 설계하중과 설계하중의 50%)을 일정횟수 반복재하한 후 정적 직접전단실험을 통해 측정한 perfobond 전단연결재의 잔류강도는, 홀 관통철근이 없는 시험체의 잔류강도는 최대전단강도의 약 65% 수준으로 저하되었으나, 홀 관통철근이 설치된 시험체의 잔류강도는 반복재하하중에 의하여 크게 감소되지 않음을 확인할 수 있었다. 따라서, 교량과 같이 피로하중이 빈번히 작용하는 구조물에 perfobond 전단연결재를 사용할 경우, 전단강도의 저하를 방지하기 위해 홀 관통철근 배근이 필요한 것으로 나타났다. This paper deals with the static shear strength and residual strength after cyclic loading of perfobond rib shear connectors. A total of eighteen push-out specimens with perfobond rib shear connectors were fabricated and a series of static and residual push-out tests were conducted. Then, the influences of hole crossing bars, concrete dowel, and cyclic loading on the shear strength were evaluated experimentally. As a results of this study, it is proved that the concrete dowel action is charge of 65% in ultimate shear strength of perfobond shear connectors, and the hole crossing bars increase the shear strength of that in two times. Especially, at the time of failure of shear connectors, the hole crossing bars significantly increase ductility of load-slip behavior. According to the residual push-out tests applying two types of cyclic loadings, design load and 50% of design load specified in Korean Highway Bridge Design Code, the residual strength, which was drawn by static push-out test after cyclic loadings, of the specimens without hole crossing bars were reduced to 65% of ultimate strength. However, the residual strength of the hole crossing bars were not reduced significantly. Therefore, as the perfobond shear connectors are applied to the Bridges which are frequently subjected to the fatigue loadings, it is designable to install hole crossing bar in order to prevent reducing of shear strength by fatigue loadings.
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