摘要
针对悬臂浇筑大跨桥梁因混凝土徐变与预应力筋流变效应引发的长期挠度问题,提出了一种基于低精度监测数据的挠度函数逆向修正方法。通过建立结构变形与内力的逆向分析模型,解决材料性能退化(混凝土开裂)和边界条件改变(支座沉降)共同作用下的挠度预测难题。通过跨度变形反推结构内力,提出了一种基于低精度大地测量数据的挠度函数修正算法。分析结果表明,该算法显著提高了关键区段挠度计算精度,有效平滑了原始数据中的随机波动,在最大跨度区域表现出良好的适用性。工程案例验证表明,修正后的挠度函数能够准确反映施工阶段结构内力重分布特征。研究成果为桥梁施工监控提供了新的分析工具,其局部修正特性对监测系统的传感器布置具有参考价值,实现了低精度数据在结构性能评估中的有效应用。
Aiming at the long-term deflection problems of cantilever cast-in-place long-span bridges caused by concrete creep and the rheological effect of prestressed tendons,an inverse correction method of deflection function based on low precision monitoring data was proposed.By establishing the inverse analysis model of structural deformation and internal force,the problem of deflection prediction under the joint action of material performance degradation(concrete cracking)and boundary condition changing(bearing settlement)was solved.A deflection function correction algorithm based on low precision geodetic data is proposed by deducing the internal force of the structure through the span deformation.The results show that the algorithm significantly improves the accuracy of deflection calculation in key sections,effectively smoothes the random fluctuations of the original data,and shows good applicability in the maximum span area.The engineering case shows that the modified deflection function can accurately reflect the redistribution characteristics of structural internal force in the construction stage.The research results provide a new analysis tool for bridge construction monitoring,and its local correction characteristics have reference value for the sensor layout of the monitoring system,and make the effective application of low precision data in structural performance evaluation.
作者
冯磊
FENG Lei(Third Engineering Co.,Ltd.,China Railway 18th Bureau Group Co.,Ltd.Zhuozhou 072750,China)
出处
《市政技术》
2025年第8期160-168,共9页
Journal of Municipal Technology
基金
中铁十八局集团有限公司2022年度科研创新项目(C2022-051)
中国铁建股份有限公司2022年度科技研究开发计划及资助课题(2022-C1)。
关键词
大跨度悬臂混凝土桥梁
流变效应
内力反演
数学建模
服役寿命
应力分析
large-span cantilever concrete bridge
rheological effects
internal force inversion
mathematical modeling
service life
stress analysis
