A Macro Model for Simulating Strength Degradation in Shear-Critical RC Columns

Yousok Kim

doi:10.7734/COSEIK.2026.39.1.71

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2026 Vol.39, Issue 1 Preview Page

Research Paper

A Macro Model for Simulating Strength Degradation in Shear-Critical RC Columns 전단파괴형 RC 기둥의 내력저하 거동 재현을 위한 매크로 모델

28 February 2026. pp. 71-79

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Abstract

Shear failure followed by axial collapse in reinforced concrete (RC) columns with insufficient transverse reinforcement represens a critical structural failure mode. Conventional analytical models often fail to accurately capture flexural-shear-axial interaction effects, whereas detailed finite element methods entail substantial computational cost. This study proposes a novel macro-element model that integrates material-level accuracy with the computational efficiency of line elements. The column is discretized into three elements along the longitudinal axis. Plate elements are formulated using a four-node plane-stress model incorporating the modified compression field theory (MCFT) to represent biaxial stress states and concrete compression softening. A double-nested iteration scheme is developed to satisfy equilibrium conditions. Validation against experimental data demonstrates that the proposed model accurately reproduces post-peak strength degradation and shear failure behavior, thereby addressing the key limitations of conventional fiber-based models.

Keywords

RC column

shear failure

macro-model

modified compression field theory (MCFT)

flexural-shear-axial interaction

전단 보강근이 불충분한 철근콘크리트(RC) 기둥에서 발생하는 전단 파괴 및 이에 따른 축 붕괴는 매우 치명적인 파괴 유형이다. 기존의 모델들은 힘 모멘트-전단력-축력 간의 복잡한 상호작용을 모사하는 데 한계가 있는 반면, 정밀 유한요소해석법은 전체 골조 해석에 적용하기에는 연산 비용이 높다는 단점이 있다. 이에 본 연구에서는 재료 수준의 정밀도와 선요소의 해석 효율성을 결합한 새로운 매크로모델을 제안한다. 제안된 모델은 기둥을 3개의 요소로 분할한다. 면요소에는 수정 압축장 이론(MCFT)을 도입한 4절점 평면 응력 정식화를 적용하여, 콘크리트의 2축 응력 상태와 압축 연화(Compression Softening) 효과를 고려하였다. 또한, 해석의 수렴성과 평형 조건을 만족시키기 위해 이중 중첩 반복 계산 알고리즘을 개발하였다. 실험 데이터와의 검증 결과, 제안 모델은 기존 파이버 모델의 한계를 극복하고 최대 강도 이후의 내력 저하 및 전단 파괴 거동을 성공적으로 예측함을 확인하였다.

키워드

철근콘크리트 기둥

전단파괴

매크로모델

수정압축장이론

휨-전단-축력 상호작용

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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 : 39
No :1
Pages :71-79
Received Date : 2026-01-06
Revised Date : 2026-01-06
Accepted Date : 2026-01-06
DOI :https://doi.org/10.7734/COSEIK.2026.39.1.71

Journal of the Computational Structural Engineering Institute of Korea ISSN:1229-3059(Print) 2287-2302(Online) 한국전산구조공학회 논문집

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