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Research Paper

Numerical Simulation of 72m-Long Ultra High Performance Concrete Pre-Stressed Box Girder

72m 초고강도 콘크리트 프리스트레스트 박스 거더의 수치 해석

Viet-Chinh Mai1
,
Sang Mook Han2*
마이 비엣 징1
,
한 상묵2*
1PhD Student, Department of Civil Engineering, Kumoh National Institute of Technology, Gumi, 19177, Korea
2Professor, Department of Civil Engineering, Kumoh National Institute of Technology, Gumi, 19177, Korea
1금오공과대학교 토목공학과 박사과정
2금오공과대학교 토목공학과 교수
*Corresponding Author
30 April 2022. pp. 73-82
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Abstract

The study presents a three-dimensional approach to simulate the nonlinear behavior of a 72 m long Ultra High Performance Fiber Reinforced Concrete (UHPFRC) pre-stressed box girder for a pedestrian bridge in Busan, South Korea. The concrete damage plasticity (CDP) model is adopted to model the non-linear behavior of the UHPFRC material, in which the material properties are obtained from uniaxial compressive and tensile tests. The simulation model based on the proposed stress-strain curve is validated by the results of four-point bending model tests of a 50 m UHPFRC pre-stressed box girder. The results from the simulation models agree with the experimental observations and predict the flexural behavior of the 50 m UHPFRC pre-stressed box girder accurately. Afterward, the validated model is utilized to investigate the flexural behavior of the 72 m UHPFRC pre-stressed box girder. Here, the load-deflection curve, stress status of the girder at various load levels, and connection details is analyzed. The load-deflection curve is also compared with design load to demonstrate the great benefit of the slender UHPFRC box girder. The obtained results demonstrate the applicability of the nonlinear finite element method as an appropriate option to analyze the flexural behavior of pre-stressed long-span girders.

Keywords
ultra-high performance fiber reinforced concrete(UHPFRC)
pre-stressed girder
box girder
shear key
segmental girder

이 논문은 72m 초고강도 콘크리트 섬유보강 콘크리트 프리스트레스트 박스거더의 비선형 거동을 해석하는 3차원 해석방법을 제시하였다. UHPC재료의 비선형 거동을 나타내기 위해 콘크리트 손상소성(CDP)모델을 채택하였다. 제시된 응력-변형률 관계 곡선에 근거한 수치해석 모델은 50m UHPC 프리스트레스트 박스 거더 휨실험결과로 검증하였다. 검증된 해석모델을 사용하여 72m UHPC 프리스트레스트 박스거더의 휨거동을 파악하는데 적용하였다. 각 하중단계에 따른 하중 변위관계, 응력상태 및 연결부분 상세를 해석하였다. 하중-변위관계 곡선과 설계하중 및 극한하중 비교 결과는 UHPC 박스거더 휨거동을 해석하는 적절한 수단으로써 비선형 유한요소법의 적용성을 입증하고 있다.

키워드
초고강도 콘크리트
섬유보강 콘크리트
박스 거더
프리스트레스트 거더
전단키
분절 거더
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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 : 35
  • No :2
  • Pages :73-82
  • Received Date : 2021-12-03
  • Revised Date : 2022-01-27
  • Accepted Date : 2022-02-21
  • DOI :https://doi.org/10.7734/COSEIK.2022.35.2.73
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