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This paper expounds the mechanical performance of beam bridges and summarizes the basic parameters of beam bridge design. Taking the long-span continuous steel box girder with a mid-span of 97 m as the research background, seven different working conditions were designed. Through the change of the ratio of the height to the span of the girder, the variation laws of the bending moment, stiffness, stress, plate thickness and steel consumption of the key sections of the steel box girder were studied. Through the analysis of the calculation results, it can be seen that increasing the beam height at the fulcrum of the continuous beam bridge can reduce the positive bending moment in the span, thus reducing the steel used in the bridge and increasing the steel utilization rate.

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Research on the Design Method of Long-Span Continuous Steel Box Girder

  • 会议论文

  • 发表日期：

    2025年

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  • Peng Liu,
  • Dong Chen,
  • Shanwei Li

摘要

This paper expounds the mechanical performance of beam bridges and summarizes the basic parameters of beam bridge design. Taking the long-span continuous steel box girder with a mid-span of 97 m as the research background, seven different working conditions were designed. Through the change of the ratio of the height to the span of the girder, the variation laws of the bending moment, stiffness, stress, plate thickness and steel consumption of the key sections of the steel box girder were studied. Through the analysis of the calculation results, it can be seen that increasing the beam height at the fulcrum of the continuous beam bridge can reduce the positive bending moment in the span, thus reducing the steel used in the bridge and increasing the steel utilization rate.