崇东双曲拱桥加固技术研究

目的提出崇东双曲拱桥加固设计方案.方法通过现场调查,检测试验,有限元软件建模内力计算从而掌握桥梁结构的实际工作状态,并对该桥病害进行分析,提出了加固整治该桥的方案.即主跨、边跨拱肋拱顶腹缘粘贴碳纤维布,主跨拱肋侧缘粘钢和主拱圈拱脚附近拱背上缘2个边腹孔内现浇10 cm厚混凝土层,拱上立柱粘钢,腹拱套拱和重新进行桥面铺装等.结果加固后崇东大桥正常使用极限状态,承载能力极限状态均满足规范要求.结论经过加固以后崇东双曲拱桥,提高主拱圈及全桥承载能力,桥跨结构表现出较大的刚度和强度.其承载能力和工作性能满足加固设计的荷载标准和使用要求.

The Research on Technologies of Chongdong Double Curve Arch Bridge Reinforcement

This research mainly focuses on reinforcement design scheme of Chongdong double curve arch bridge.Based on local survey and detecting experiment,finite element software was used to establish FEM model and calculating the real working state of bridge.After extensive analysis of bridge defects,reinforcement scheme was designed.Coating of glue carbon fabric at mid portion of main and side span,glue steel plate at the central main arch rib and the spandrel column were designed to be rehabilitated with steel plate cover.Further,10 cm thick concrete at springing of arch was recommended.On top of that,spandrel arch was designed to rehabilitate with RC concrete and rebuilt for pavement is strongly recommended.The rehabilitated bridge meets the normal working condition and the limiting serviceability condition.It is concluded that after the Chongdong double curve arch bridge are reinforced,the bridge structure bearing capacity is much enhanced,which shows big strength and stiffness,the bearing capacity and work state meet the design and use requirement.