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2025 Vol.38, Issue 3 Preview Page

Research Paper

Nonlinear Dynamic Response of Reinforced Concrete Members Subjected to Axial and Blast Loads Using a Single Degree of Freedom System

단자유도 시스템을 이용한 축력과 폭발하중을 받는 철근콘크리트 부재의 비선형 동적 응답

Tae-Hun Lim1
,
Seung-Hoon Lee2
,
Han-Soo Kim3*
임 태훈1
,
이 승훈2
,
김 한수3*
1Graduate Student, Department of Architecture, Konkuk University, Seoul, 05029, Korea
2Graduate Student, Department of Architecture, Konkuk University, Seoul, 05029, Korea
3Professor, Department of Architecture, Konkuk University, Seoul, 05029, Korea
1건국대학교 건축학과 석사과정
2건국대학교 건축학과 박사과정
3건국대학교 건축학과 교수
*Corresponding Author
30 June 2025. pp. 147-154
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Abstract

In this study, a single-degree-of-freedom (SDOF) analysis for reinforced-concrete columns subjected to axial and blast loads was performed using the OpenSees program. To verify the accuracy of the analysis, we validated and verified the resistance function of reinforced concrete columns subjected to axial and blast loads. Parametric studies of 192 variables were conducted, incorporating the reinforcement, cross-sectional, and axial load ratios as the parameters. The results indicated that neglecting axial loads could result in discrepancies of up to 50% in predicted displacements. Furthermore, ductility behavior based on a ductility ratio of 3 showed that columns with an axial load ratio below 30% exhibited ductile behavior, whereas those exceeding 30% demonstrated brittle behavior. This study developed an SDOF analysis procedure for reinforced-concrete members subjected to axial and blast loads and blast resistant design criteria based on the axial load ratio, offering useful tools for blast-resistant designs.

Keywords
SDOF
axial load
blast load
nonlinear dynamic analysis
blast-resistant design

본 논문에서는 OpenSees 프로그램을 사용하여 축력과 폭발하중을 받는 철근콘크리트 기둥의 SDOF 해석 절차를 제시하였다. 해석의 정확도를 검증하기 위해 저항함수 검증과 축력 및 폭발하중을 받는 철근콘크리트 기둥의 동적 거동을 비교하였다. 192개 단면에 대해 재료 강도, 철근비, 단면비, 축하중비를 주요 매개변수로 사용하여 매개변수 해석을 수행하였다. 축력을 고려하지 않을 경우 최대 변위에 있어서 최대 50%의 오차가 발생하였다. 연성비 3을 기준으로 축하중비 30% 미만에서는 연성 거동을, 30% 이상에서는 취성 거동을 보였다. 본 연구는 축력과 폭발하중을 받는 철근콘크리트 부재의 SDOF 해석 절차를 개발하고, 축하중비에 따른 내폭 설계 기준을 제시함으로써 내폭 설계에 널리 활용될 수 있다.

키워드
SDOF
축하중
폭발하중
비선형 동적해석
내폭설계
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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 : 38
  • No :3
  • Pages :147-154
  • Received Date : 2024-12-26
  • Revised Date : 2025-02-18
  • Accepted Date : 2025-02-18
  • DOI :https://doi.org/10.7734/COSEIK.2025.38.3.147
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