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박정천 ( Park Jeong-cheon ),권형오 ( Kwon Hyung-o ),김효범 ( Kim Hyo-beom ),김성배 ( Kim Sung-bae ),남진원 ( Nam Jin-won ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1
In thermal power plant, steam is made by boiler. As it rotates turbine, electric power is generated. Thermal power plant has a high-rise structure that has a boiler and other equipment. Thermal expansion of the boiler is large because combustion temperature is high. The boiler vibrates easily because it is suspended from the top of the support structure in order not to restrict deformation by thermal expansion. Thus, the boiler structure supported by the hanger is very vulnerable to earthquakes. In this study, numerical analysis was carried out in order to investigate behavior of the boiler structure in the thermal power plant under earthquakes.
박정천(Park, Jeong-Cheon),김태균(Kim, Tae-Kyun),최우석(Choi, Woo-Seok),최헌(Choi, Heon),김성배(Kim, Sung-Bae) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2
The objective of this study is to investigate bond strength of fire resistance panel. The bond strength tests were conducted pull-off test and fatigue tests with an application of repeated loading. The pull-off result showed the average 0.51MPa of bond strength and the fatigue test result showed undeboned fire resistance panel from concrete slab after 2,000,000 of cycle loads. Therefore, fire resistance panel can be applied to underground roadway and tunnel without debonding due to bond strength deficiency.
박정천(Park, Jeong-Cheon),김태균(Kim, Tae-Kyun),최헌(Choi, Heon),최홍식(Choi, Hong Shik),김성배(Kim, Sung-Bae) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2
In this study, the performance of precast RC slabs with fire resistance panel for fire resistance of tunnel system was evaluated by experimentally. The fire test was performed in fire resistance(electric) furnace according to RABT(Richtlinien fur die Ausstatung und den Betrieb von Straβentunneln) time heating temperature curve. The test results showed that the measured temperatures at the t=0mm depth of RC slab with precast fire resistance panel during a fire was maximum temperature 367℃, lower than 308℃, when damage occurs. Also, at the t=25mm, the maximum temperature was 239℃, which was lower than the damage temperature of rebar, 250℃. From the results, the use of precast fire resistance panel improves fire resistance of RC structures.
박정천(Park Jeong Cheon),이상원(Lee Sang Won),김성배(Kim Sung Bae),김장호(Kim Jang-Ho Jay) 대한토목학회 2011 대한토목학회논문집 A Vol.31 No.6A
본 연구에서는 경질형 폴리우레아로 보강된 RC 슬래브의 보강성능과 파괴거동을 파악하기 위한 실험적 연구를 수행하였다. 보강성능을 평가하기 위해 경질형 폴리우레아를 도포한 시험체와 기존의 보강재로 사용되는 탄소섬유시트와 유리섬유시트를 부착한 시험체 무보강 시험체를 제작하여 실험을 수행하였으며 구조물의 보강성능에 큰 영향을 미치는 부착성능 평가도 수행하였다. 휨 성능 평가결과로는 경질형 폴리우레아를 도포한 시험체는 무보강 시험체보다 높은 휨 성능을 보였지만 섬유시트를 부착한 시험체보다는 다소 낮은 휨 성능을 나타내었다. 하지만 경질형 폴리우레아를 도포한 시험체는 탄성범위를 넘어선 소성구간에서의 연성거동은 우수한 것으로 나타났다. 부착성능 결과에서는 모든 시험체의 부착성능이 표준부착 강도인 1.5 ㎫ 이상의 값으로 높게 나타났다. 또한 경질형 폴리우레아를 도포한 시험체는 섬유시트의 보강방법에 사용되는 에폭시 레진을 사용하지 않아도 인장용 지그와 경질형 폴리우레아의 탈락이 일어나지 않고 콘크리트 모재와의 탈락이 발생한 것으로 나타나 경질형 폴리우레아를 콘크리트의 보강재로 사용 할 경우 부착성능의 저하로 인한 보강효과의 성능저하는 일어나지 않을 것으로 확인되었다. ; ;An experimental study was performed to evaluate the possibility of using stiff type PolyUrea(PU) on RC slab as a strengthening material. Stiff type PU(STPU) was sprayed on the bottom surface of the slab specimens which were then attached with CFRP or GFRP sheets. Also the evaluation of the bond capacity the single most influential parameter on strengthening of RC structures was carried out the flexural capacity evaluation test results showed that the load carrying capacity of the PU specimen was greater and less than the unstrengthened and FRP sheet attached specimens respectively. The STPU specimens showed a ductile flexural behavior in the plastic displacement range. With respect to bond capacity the bond strength of all of the specimen exceeded the code required bond strength of 1.5 ㎫. Also the STPU sprayed specimen without using epoxy resin did not peel off when the tensile grip was applied for testing. The stability of the PU bond failure indicate a good bond strength of PU when applied to concrete.