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Steel and Composite Structures
  Volume 34, Number 3, February10 2020 , pages 423-440

Effect of residual stress and geometric imperfection on the strength of steel box girders
Eun-Ji Jo1a, Quang-Viet Vu and Seung-Eock Kim

    In the recent years, steel box girder bridges have been extensively used due to high bending stiffness, torsional rigidity, and rapid construction. Therefore, researches related to this girder bridge have been widely conducted. This paper investigates the effect of residual stresses and geometric imperfections on the load-carrying capacity of steel box girder bridges spanning 30 m and 50 m. A three – dimensional finite element model of the steel box girder with a closed section was developed and analyzed using ABAQUS software. Nonlinear inelastic analysis was used to capture the actual response of the girder bridge accurately. Based on the results of analyses, the superimposed mode of webs and flanges was recommended for considering the influence of initial geometric imperfections of the steel box model. In addition, 4% and 16% strength reduction rates on the load – carrying capacity of the perfect structural system were respectively recommended for the girders with compact and non-compact sections, whose designs satisfy the requirements specified in AASHTO LRFD standard. As a consequence, the research results would help designers eliminate the complexity in modeling residual stresses and geometric imperfections when designing the steel box girder bridge.
Key Words
    residual stress; geometric imperfection; steel box girder; nonlinear inelastic analysis; ABAQUS
Eun-Ji Jo1a and Seung-Eock Kim: Department of Civil and Environmental Engineering, Sejong University, 98 Gunja-dong, Gwangjin-gu, Seoul 05006, South Korea
Viet Vu: Institute of Research and Development, Duy Tan University, Danang 550000, Vietnam

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