Earticle

초록

영어

The trend toward longer bridge spans has increased the length and slenderness of PSC I-girders, which in turn amplifies the risk that small lateral displacements arising during fabrication and erection may develop into global toppling failures. This study numerically investigates the toppling behavior of long-span girders induced by initial lateral curvature during lifting, and validates the reliability of the analysis model by comparison with theoretical equilibrium equations. Finite element analyses were performed using the general-purpose program Abaqus for PSC I-girders with spans of 40 m, 60 m, and 80 m. The eccentricity due to initial lateral curvature was modeled as a parabolic profile with maximum offsets at midspan of 30 mm, 50 mm, and 100 mm, selected with reference to practical limiting values used in the field. The lifting condition was simulated by explicitly modeling the upper rotation center and the girder connection points so as to reflect the geometric configuration of the lifting wires, while the concrete was assumed to behave linearly elastically using its elastic modulus and unit weight. The analysis results show that, under the critical initial eccentricity condition for each span, the equilibrium rotation angle induced by self‑weight exceeds approximately 1.0°, corresponding to additional horizontal displacements of more than 44 mm at the top of the girder. This rotational response approaches the limit of the available restoring moment, indicating a highly unstable state with very low safety margin against toppling during erection. Furthermore, when the numerically obtained rotation angles were substituted into the static equilibrium equations for overturning and restoring moments, the theoretical and numerical results exhibited close agreement, thereby confirming the reliability of the proposed finite element model.

저자

• Dong-min Song [ Kumoh National Institute of Technology; Korea Expressway Corporation ]
• Youg-ji Park [ Kumoh National Institute of Technology; Korea Expressway Corporation ]
• Won-tae Kim [ Kumoh National Institute of Technology; Korea Expressway Corporation ]
• Seung-won Lee [ Kumoh National Institute of Technology; Korea Expressway Corporation ]
• Seong-kyum Kim [ Kumoh National Institute of Technology; Korea Expressway Corporation ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국재난정보학회 학술발표대회

• 간기

  부정기

• 수록기간

  2005~2026

• 십진분류

  KDC 338 DDC 361