Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Buckling Analysis using Fictitious Axial Forces and Its Application to Cable-Stayed Bridges with HSB800 Steel

가상축력을 이용한 좌굴해석 및 HSB800 강재를 적용한 사장교에 대한 적용성 분석

  • Choi, Dong Ho (Dept. of Civil and Environmental Engineering, Hanyang University) ;
  • Yoo, Hoon (R&D Center, Hyundai Engineering and Construction) ;
  • Gwon, Sun Gil (Dept. of Civil and Environmental Engineering, Hanyang University) ;
  • Lim, Ji Hoon (Dept. of Civil and Environmental Engineering, Hanyang University)
  • 최동호 (한양대학교, 건설환경공학과) ;
  • 유훈 (현대건설, 연구개발본부) ;
  • 권순길 (한양대학교, 건설환경공학과) ;
  • 임지훈 (한양대학교, 건설환경공학과)
  • Received : 2015.11.26
  • Accepted : 2016.10.11
  • Published : 2017.02.28
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Abstract

System buckling analysis is usually used to determine the critical buckling load in the buckling design of cable-stayed bridges. However, system buckling analysis may yield unexpectedly large effective lengths of the members subjected to a relatively small axial force. This paper proposes a new method to determine reasonable effective lengths of girder and tower members in steel cable-stayed bridges using fictitious axial forces. An improved inelastic buckling analysis with modified tangent modulus is also presented. The effective lengths of members in example bridges calculated using the proposed method are compared with those obtained using the conventional buckling analysis method. The proposed method provides much more resonable effective lengths of the members. When girder and tower members are built with HSB800 steel instead of conventional steel, the effective lengths of the members under a small axial force slightly decreases in the inelastic buckling analysis without fictitious axial forces, while the proposed method that considers fictitious axial forces provides almost no changes in such lengths.

사장교의 부재별 임계좌굴하중 산정에는 일반적으로 시스템 좌굴해석이 사용된다. 그러나 기존의 시스템 좌굴해석은 압축력이 미소한 부재에 대하여 과도하게 긴 유효좌굴길이를 산정하는 문제점을 내포하고 있다. 본 연구에서는 가상축력을 이용하여 강사장교 부재의 유효좌굴길이를 합리적으로 결정할 수 있는 좌굴해석 방법을 제안하였다. 또한, 수정된 유효접선탄성계수를 이용한 개선된 비탄성 좌굴해석방법을 제시하였다. 제안방법을 예제 사장교 모델에 적용하여 해석결과를 기존의 좌굴해석 방법과 비교 검증하였다. 검증결과, 제안된 방법은 강사장교 거더와 주탑의 유효좌굴길이를 합리적으로 예측할 수 있었다. 그리고 거더와 주탑에 일반강재 대신 HSB800 강재를 적용하였을 경우, 가상축력을 고려하지 않은 제안된 비탄성 좌굴해석에서는 유효좌굴길이가 축력이 작은 부분에서 약간 감소하였으나, 가상축력을 적용한 제안된 비탄성 좌굴해석에서는 유효좌굴길이의 변화가 거의 나타나지 않았다.

Keywords

References

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