[논문]강섬유보강콘크리트의 압축거동 특성을 반영한 기둥의 내폭해석

김재민; 이상훈; 김재현; 김강수

doi:10.11112/jksmi.2023.27.5.105

강섬유보강콘크리트의 압축거동 특성을 반영한 기둥의 내폭해석
Numerical Study on Columns Subjected to Blast Load Considering Compressive Behavior of Steel Fiber Reinforced Concrete 원문보기

한국구조물진단유지관리공학회 논문집 = Journal of the Korea Institute for Structural Maintenance and Inspection, v.27 no.5, 2023년, pp.105 - 112

김재민 (서울시립대학교 건축공학과 스마트시티융합전공) , 이상훈 (서울시립대학교 건축공학과 스마트시티융합전공) , 김재현 (서울시립대학교 건축학부) , 김강수 (서울시립대학교 건축공학과 스마트시티융합전공)

초록
AI-Helper

강섬유보강콘크리트는 일반 콘크리트에 비해 높은 강도 및 우수한 에너지 소산 능력을 보이며, 폭발하중 작용 시 균열 전파 및 파편 발생을 감소시킬 수 있다. 본 연구에서는 유한요소해석 프로그램인 LS-DYNA에 SFRC 재료물성을 구현하고자 콘크리트 비선형 재료모델인 K&C 모델의 파괴 곡면(Failure surface) 및 손상 함수(Damage function)를 정의하는 파라미터를 제안하였다. 제안 파라미터 검증을 위하여 단일요소해석을 수행하였으며, 제안 파라미터가 적용된 재료모델은 SFRC 재료시험 거동을 상당히 유사하게 모사하는 것으로 나타났다. 또한, 강섬유 혼입률에 따른 SFRC 기둥의 성능을 평가하기 위하여 내폭해석을 수행하였으며, KOSHA 규정을 참조하여 섬유 혼입률에 따른 SFRC 기둥의 내폭성능을 정량적으로 분석하였다.

Abstract ▼ AI-Helper

Steel fiber reinforced concrete (SFRC) exhibits enhanced strength and superior energy dissipation capacity compared to normal concrete, and it can also reduce crack propagation and fragmentation of concrete even when subjected to blast loads. In this study, the parameters defining failure surface and damage function of the K&C concrete nonlinear model were proposed to be applied for the properties of SFRC in LS-DYNA. Single element analysis has been conducted to validate the proposed parameters in the K&C model, which provided very close simulations on the compressive behavior of SFRC. In addition, blast analysis was performed on SFRC columns with different volume fractions of steel fibers, and the blast resistance of SFRC columns was quantitatively analyzed with Korea Occupational Safety & Health Agency (KOSHA) guidelines.

주제어

표/그림 (13)

그림 Fig. 1 Failure surfaces in K&C model
표 Table 1 Parameters of failure surface for SFRC
그림 Fig. 2 Structure of ANN model
그림 Fig. 3 Activation functions of ANN model
그림 Fig. 5 Stress-strain curve derived from single element analysis and test
그림 Fig. 4 Single element analysis model
표 Table 2 Ten pairs of EOS parameters for SFRC
그림 Fig. 6 Normalized stress-strain curve
그림 Fig. 7 shock tube test set up (Burrell et al., 2015)
그림 Fig. 8 Details of blast analysis model
그림 Fig. 9 Comparison of displacement-time curves
그림 Fig. 10 Blast analysis results of SFRC columns
표 Table 3 Response limits for RC members presented in KOSHA GUIDE D-65-2018 and Response of SFRC members by blast analysis

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