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2019 Vol.32, Issue 5 Preview Page
Effect of Ground Boundary Condition on Evaluation of Blast Resistance Performance of Precast Arch Structures

지반경계조건이 프리캐스트 아치구조물의 폭발저항성능 평가에 미치는 영향

Jungwhee Lee1
,
Keunki Choi1†
,
Dongseok Kim2
이 정 휘1
,
최 근 기1†
,
김 동 석2
1Department of Civil and Environmental Engineering, Dankook Univ., Yongin, 16890, Korea
2Institute of Technology, Interconstech Co., Ltd., Seoul, 03922, Korea
1단국대학교 토목환경공학과
2(주)인터컨스텍 기술연구소
†Corresponding author: Tel: +82-31-8005-3493; E-mail: ckk0204@dankook.ac.kr
2019. pp. 287-296
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Abstract

In this study, the effect of ground boundary conditions on the evaluation of blast resistance performance of precast arch structures was evaluated by a numerical analysis method. Two types of boundary conditions, namely, fixed boundary conditions and a perfectly matched layer (PML) were applied to numerical models. Blast loads that were much higher than the design load of the target structure were applied to compare the effects of the boundary conditions. The distribution and path of the ground explosion pressure, structural displacement, fracture of concrete, stress of concrete, and reinforcing bars were compared according to the ground boundary condition settings. As a result, the reflecting pressure shock wave at the ground boundaries could be effectively eliminated using PML elements; furthermore, the displacement of the foundation was reduced. However, no distinct difference could be observed in the overall structural behavior including the fracture and stress of the concrete and rebar. Therefore, when blast simulations are performed in the design of protective structures, it is rational to apply the fixed boundary condition on the ground boundaries as conservative design results can be achieved with relatively short computation times.

Keywords
blast resistance
blast simulation
PML
LS-DYNA
precast arch structures

본 논문에서는 지반경계조건의 설정이 프리캐스트 아치구조물의 폭발저항성능 평가에 미치는 영향을 수치해석적 기법을 사용하여 파악하고자 하였다. 지반경계조건은 고정조건과 PML(perfectly matcher layer)을 이용한 경계조건의 두 가지로 적 용하였으며, 폭발하중은 대상 구조물의 설계하중보다 큰 하중을 사용하여 경계조건의 영향을 명확히 비교할 수 있도록 하였 다. 폭발압력의 분포 및 경로, 구조물에 발생하는 변위, 콘크리트의 파쇄여부, 콘크리트 및 철근의 응력을 비교․분석하였으 며, PML을 적용하였을 때 지반 경계면에서 발생하는 반사파를 효과적으로 제거할 수 있음을 확인하였다. 또한, 이로 인해 구조물 기초부의 변위가 감소하는 것으로 나타났다. 하지만, 콘크리트의 파쇄여부, 콘크리트 및 철근에 발생하는 응력을 포 함한 전반적인 구조물의 거동에는 뚜렷한 차이가 발생하지 않았다. 따라서 방호시설의 설계를 목적으로 폭발시뮬레이션을 수행하는 경우에는 지반경계조건에 고정조건을 적용하였을 때 안전측의 결과를 얻을 수 있으며, 해석시간이 단축되는 이점 도 있으므로 이러한 면을 종합적으로 고려하여 지반경계조건을 고정조건으로 적용하는 것이 합리적이라고 판단된다.

키워드
폭발저항성능
폭발시뮬레이션
PML
LS-DYNA
프리캐스트 아치구조물
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Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 32
  • No :5
  • Pages :287-296
  • Received Date : 2019-05-09
  • Revised Date : 2019-05-29
  • Accepted Date : 2019-05-30
  • DOI :https://doi.org/10.7734/COSEIK.2019.32.5.287
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