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강섬유 보강 콘크리트 구조물의 해석을 위한 K&C모델의 보정

Modified K&C Model for Numerical Analysis of Steel-Fiber-Reinforced Concrete Structure

이민주|박강규
한국전산구조공학회 (The Computational Structural Engineering Institute Of Korea)|2021.04|한국전산구조공학회논문집 (Journal of the Computational Structural Engineering Institute of Korea)|제34권 제2호|pp. 85-91|DOI https://doi.org/10.7734/COSEIK.2021.34.2.85

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키워드

유한요소해석dynamic analysisfinite element model강섬유보강 콘크리트K&C model동적 해석K&C모델steel-fiber-reinforced concrete

초록

본 연구에서는 섬유보강콘크리트(SFRC) 구조물의 수치해석을 위한 K&C모델의 보정기법을 소개하였다. SFRC 1축 및 3축 압축강도 실험결과를 기반으로 보정을 수행하였으며, 단일요소 해석결과를 실험결과와 비교함으로써 보정 기법의 검증을 수행하였다. 또한, 변형률 속도의 영향을 반형하기 위해 동적증가계수(DIF)를 고려하여 SFRC 구조물의 발사체 관통해석을 수행함으로써 보정기법의 적용 가능성을 확인하였다.

Abstract

This paper introduces a modified Karagozian & Case concrete model (K&C model) for the numerical analysis of a steel-fiber-reinforced concrete (SFRC) structure subjected to projectile impact. The original K&C model was calibrated to consider the effects of steel fibers accurately by modifying the strength surfaces and input parameters. Single element tests were then conducted and compared with uniaxial and triaxial compressive data to verify the modified model. With the application of a dynamic increase factor, the finite element model of the SFRC structure subjected to projectile impact was constructed. Thereafter, the applicability of the modified material model was examined by comparisons with the experimental results.

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