某公路混凝土箱梁桥维修加固方案研究
Research on Maintenance and Reinforcement Scheme for a Highway Concrete Box Girder Bridge
王文飞1
作者信息
- 1. 安徽省交通控股集团有限公司,安徽 合肥 230001
- 折叠
摘要
腹板和底板裂缝是混凝土箱梁桥中的常见病害之一,结构性裂缝会严重影响结构安全,降低结构的耐久性.文章依托混凝土箱梁桥,在资料搜集及专项检测的基础上,采用有限元软件进行数值模拟分析,对裂缝病害的主要影响因素进行参数敏感性分析,得出预应力损失是导致裂缝病害产生的主要原因.通过采用箱内增设体外预应力、增设钢桁架横隔板及底板粘贴钢板的综合加固措施对箱梁病害进行针对性处治.加固后验算结果表明,采取上述加固措施后,提高了箱梁的承载能力及刚度,改善了主梁断面应力分布,可有效抑制后期裂缝发展.
Abstract
The crack in web and bottom plate is one of the common diseases in concrete box girder bridges.Structural cracks will seriously affect the structural safety and reduce the durability of the structure.Based on the concrete box girder bridge,on the basis of data collection and special detection,the finite element software is used for numerical simulation analysis,and the parameter sensitivity analysis of the main influencing factors of the crack disease is carried out.It is concluded that the prestress loss is the main cause of the crack disease.Through the comprehensive reinforcement measures of adding external prestressing in the box,adding steel truss intermediate diaphragm,and pasting steel plate on the bottom plate,the disease of box girder is treated pertinently.The verification results after reinforcement show that the bearing capacity and stiffness of the box girder are improved and the stress distribution of the main girder section is improved after the above reinforcement measures are taken,which can effectively inhibit the development of cracks in the later stage.
关键词
混凝土箱梁桥/裂缝病害/维修加固/承载能力/体外预应力Key words
concrete box girder bridge/crack disease/maintenance and reinforcement/bearing capacity/external prestressing引用本文复制引用
出版年
2024
NETL
NSTL
万方数据