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Experiments on Blast Protective Systems using Aluminum Foam Panels
윤누리,신동훈,Sung-Woong Ji,심창수 대한토목학회 2014 KSCE Journal of Civil Engineering Vol.18 No.7
Aluminum foams are lightweight energy absorption materials that are used to mitigate impact or shock pressure. In this paper, a blast-protection system which includes sacrificial panels and blast doors constructed using aluminum foams is described. Aluminum alloy foam was developed to enhance the mechanical properties of this system for improved blast pressure mitigation. Two blast tests were performed on aluminum foam panels, concrete walls with sacrificial claddings, and a lightweight blast door in order to evaluate the performance of the blast protection system. Due to the limited tensile strength of the foam, it should be used as sacrificial claddings. The infilled aluminum foam can decrease the permanent deformation of the panels, and decrease the plastic deformation by increasing the foam density. If the panels are properly anchored at the ends, they can have excellent blast resistance, even for localized high blast pressures, due to plastic deformation of the foam and membrane action of the cover plates. Test results of concrete walls strengthened by sacrificial claddings showed that the aluminum foam reduced blast pressure significantly. Even though the proposed blast resistant door is much lighter, it provided adequate protection to secure building occupants.
11.15 지진 사례를 통한 지진피해 시설물 위험도 평가 체계 개선
강형구,윤누리,김다위,이정한,김혜원,오금호 한국지진공학회 2018 한국지진공학회논문집 Vol.22 No.3
Post-earthquake risk assessment technique in Korea is developed in 2013 by National Disaster Management Research Institute, at the same time, related manual and standard regulation is distributed to every local government by National Emergency Management Agency. The objectives of this research are to investigate and evaluate the post-earthquake risk assessment of 9.12 Earthquake (M5.8, Gyeongju City, 2016) and 11.15 Earthquake (M5.4, Pohang City, 2017). To suggest and improve the assessment process of post-earthquake risk, first post-earthquake risk assessment method of advanced foreign countries including US, New Zealand and Japan are compared, and post-earthquake evaluation activities in 9.12 Earthquake and 11.15 Earthquake are analyzed. From the results, it is needed to expand the adapted building and structure types and strengthen the earthquake disaster response capacity of local government.
심창수,윤누리 한국지진공학회 2010 한국지진공학회논문집 Vol.14 No.1
주요 구조물의 방호를 위해 에너지 흡수 능력이 뛰어난 알루미늄 폼을 갖는 희생부재를 제안하였다. 근거리 폭발에 의한 집중된 폭파하중의 압력 저감에 대한 외연적 유한요소해석을 통한 변수 연구를 수행하였다. 폭발하중의 규모는 Z=0.48~0.95 수준으로 설정하였고 경험적 폭발하중을 이용하였다. 알루미늄 폼의 해석 변수는 밀도와 두께로 설정하였고 덮개 여부를 고려하였다. 해석 결과로 부터 밀도가 낮고 두께가 두꺼울수록 전달압력의 수준을 알루미늄 폼의 항복강도 수준으로 제어할 수 있고 폭발의 규모가 증가하면 높은 밀도의 두꺼운 희생부재가 필요함을 보였다. 덮개는 두께의 영향이 뚜렷하고 폭발압력을 분산시키는 효과를 나타내었다. 폭발의 수준에 따라 희생부재의 에너지 소산의 정도가 달라지기 때문에 이를 고려한 희생부재의 설계변수 설정이 필요하다. A sacrificial member with aluminum foam of excellent energy absorption capacity was proposed for the protection of significant structures. Parametric studies of explicit finite element analyses were performed to investigate the pressure mitigation of close-range air-blasts. The scaled distance of the blast had a range of Z=0.48~0.95 and an empirical blast load function was utilized. The analytical parameters of the aluminum foam were density, thickness and the existence of a cover sheet. Analytical results showed that the transmitted pressure can be controlled to have a similar level of yield values of the foam by using a foam with low density and higher thickness. As the blast load increased, the sacrificial member needed to have higher density and thickness. A cover sheet of the foam clearly showed its effect on the wider distribution of blast pressure. It is necessary to determine the design parameters of sacrificial foams considering different energy dissipation capacities according to the scaled distance.