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Special Issue

Protective Design Concept and Calculation of Blast Load Estimation for Internal Explosion

내부 폭발에 대한 방호설계 개념 및 폭발하중 산정

Sangwoo Park1*
,
Hyeon-Jong Hwang2
,
Jang-Woon Baek3
,
Sangyoung Han4
,
Kukjoo Kim5
박 상우1*
,
황 현종2
,
백 장운3
,
한 상영4
,
김 국주5
1Professor, Department of Civil Engineering and Environmental Sciences, Korea Military Academy, Seoul, 01805, Rep. of Korea
2Associate Professor, School of Architecture, Konkuk University, Seoul, 05029, Rep. of Korea
3Associate Professor, Department of Architectural Engineering, Kyung Hee University, Gyeonggi, 17104, Rep. of Korea
4Assistant Professor, Department of ICT Integrated Ocean Smart City Engineering, Dong-A University, Busan, 49315, Rep. of Korea
5Protective Structure Analysis Engineer, Department of Facility Standards, Defense Installations Agency, Seoul, 04353, Rep. of Korea
1육군사관학교 토목·환경학과 교수
2건국대학교 건축학부 부교수
3경희대학교 건축공학과 부교수
4동아대학교 ICT융합해양스마트시티공학과 조교수
5국방시설본부 방호시설발전과 연구원
*Corresponding Author
13 May 2025. pp. 91-102
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Abstract

Recently, the number of high-energy industrial facility installations has been increasing, leading to a growing demand for protective design against internal explosions. Protective design for internal explosions requires a different approach compared to that for external explosions. First, when an explosion occurs inside a facility, multiple reflections between structural components result in increased peak overpressure. Moreover, due to unvented gases, internal pressure is sustained, which extends the duration of the blast load. Second, unlike typical high-explosive detonations, internal explosions involve a wide range of scenarios depending on factors such as the concentration of flammable materials, ignition sources, and surrounding environmental conditions, etc. These factors must be taken into account when determining the blast load. Finally, the primary protection target shifts from personnel and assets on the opposite side of the structure to those located outside the facility, who may be affected by pressure leaking from the internal explosion. Among these different approaches, this study introduces a method for determining the explosion design load caused by internal explosions. In addition, practical examples based on UFC 3-340-02 and ASCE guidelines are presented to assist engineers in determining internal explosion design loads in simple cases.

Keywords
High-energy industrial facility explosion
Internal explosion
Confined explosion
Interior shock pressure
Design load for Internal explosion

최근 고에너지 산업 시설의 설치 사례가 늘어남에 따라 내부 폭발에 대한 방호 설계 수요 역시 증가하고 있다. 내부 폭발에 대한 방호 설계는 외부 폭발에 대한 방호 설계와는 다른 접근 방식을 필요로 한다. 첫째, 시설 내부에서 폭발이 발생하면 구조 요소 간 다중 반사가 발생하여 최대 과압이 증가한다. 또한, 배출되지 않은 가스로 인해 내부 압력이 유지되면서 폭발 하중 지속 시간이 길어진다. 둘째, 일반적인 고밀도 폭약과는 다르게 산업시설에서의 폭발은 가연성 물질의 농도, 발화원, 주변 환경 조건 등 다양한 요인에 따라 다양한 시나리오를 수반한다. 따라서 폭발 하중을 결정할 때 이러한 요인들을 반드시 고려해야 한다. 마지막으로, 주요 방호 대상은 구조물 반대편의 인명 및 자산이 아닌 내부 폭발로 인한 압력의 누출에 대한 외부의 인명 및 자산으로 변경된다. 이러한 다양한 접근 방식 중, 본 연구에서는 내부 폭발로 인한 폭발 설계 하중을 결정하는 방법을 소개하였다. 또한, UFC 3-340-02와 ASCE 설계 기준에 따른 예제를 제시하여 실무자가 내부 폭발 설계 하중을 결정하는 데 도움이 될 수 있도록 하였다.

키워드
고에너지 산업시설 폭발
내부폭발
구속폭발
내부충격압력
내부폭발 설계하중
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Information
  • Publisher :Korea Protective Facility Institute
  • Publisher(Ko) :한국방호시설학회
  • Journal Title :Protective Facility
  • Journal Title(Ko) :방호시설
  • Volume : 2
  • No :2
  • Pages :91-102
  • Received Date : 2025-04-14
  • Accepted Date : 2025-04-23
  • DOI :https://doi.org/10.23310/PF.2025.2.2.091
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