摘要
为解决双曲拱桥拱上建筑诸多病害问题,提升双曲拱桥承载及使用性能,在传统双曲拱桥加固施工技术应用的基础上,提出了一种改变结构受力体系加固双曲拱桥的技术,即通过将原双曲拱桥拱上建筑(立墙、腹拱、实腹段填料)拆除后,新建柱梁式拱上建筑(立柱、横梁、预制桥面板)。采用Midas有限元建立双曲拱桥整体模型,对双曲拱桥加固改造施工过程分别进行强度、刚度和稳定性分析,并对双曲拱桥改造施工过程进行变形及应力监测,以验证该技术的可行性。结果表明:1)双曲拱桥加固改造施工过程中的各项数值模拟数据均满足设计要求;2)变形及应力现场监测值均与数值模拟计算值相接近;3)桥梁加固改造完成后,主拱圈截面最大压应力和最大挠度均较改造前有所降低,而改造后的稳定安全系数较改造前则大幅度增加。通过采用框架式结构来降低双曲拱桥拱上建筑自重,以实现改变结构受力体系加固双曲拱桥,效果显著,该技术可供双曲拱桥加固改造施工与设计参考。
To solve various structural defects in the spandrel structure of double-curved arch bridges and improve their load-bearing capacity and service performance,this study proposes a reinforcement technique that modifies the structural force-bearing system,based on application of traditional reinforcement construction technologies for double-curved arch bridges.That is,after removing the original spandrel structures of the double-curved arch bridge(vertical walls,abdominal arches,solid web segment fillers),a new column-beam type spandrel structure(columns,crossbeams,precast bridge decks)is constructed..A global finite element model of the double-curved arch bridge was developed using Midas software to analyze the strength,stiffness,and stability during the reinforcement process.Deformation and stress monitoring was conducted during construction to validate the feasibility of this technique.The results indicate that:1)All numerical simulation data during the reinforcement process meet design requirements;2)Field-measured deformation and stress values are close to computational results;3)After reinforcement,the maximum compressive stress and maximum deflection of the main arch ring section are both lower than those before the reconstruction,while the stability safety factor after the reconstruction is significantly increased compared with that before the reconstruction.By adopting a frame-type structure to reduce the self-weight of the spandrel construction,this technique effectively modifies the structural load-bearing system,achieving remarkable reinforcement outcomes.The proposed method provides reference for the design and construction of double-curved arch bridge rehabilitation projects.
作者
王志金
WANG Zhijin(China Railway Major Bridge Bureau Wuhan Bridge Special Technology Co.,Ltd.,Wuhan 430205;State Key Laboratory for Health and Safety of Bridge Structures,Wuhan 430056)
出处
《公路交通技术》
2025年第3期69-79,共11页
Technology of Highway and Transport
基金
中铁大桥局集团有限公司科学技术研究与开发项目(2022-重点-24)。
关键词
双曲拱桥
加固
改变结构受力体系
有限元
拱上建筑
装配式
数值模拟
施工监控
double-curved arch bridge
reinforcement
alteration of structural force system
finite element
superstructure
prefabricated
numerical simulation
construction monitoring
