基于毫米波雷达测控的桥梁状态评估与数值仿真分析

Bridge state evaluation and numerical simulation analysis based on millimeter-wave radar measurement and control

为研究悬臂施工的特大桥关键施工节点及结构的自动化监测技术,在悬臂施工桥段的沉降变形及受力阶段开展0#块雷达测控、施工节段沉降变形监测及整桥力学响应监测.将实际施工中受力和沉降变形的测控数据与仿真数据进行对比分析,通过两者的吻合度来判断施工过程中桥段的安全状态.借助数理统计方法,对比雷达测控数据与传统监测数据的精确性.研究结果表明:雷达测控可在全天候开展工作,并能够结合施工日志,对云图中典型波动进行分析;毫米波雷达测控0#块沉降变形值的拟合值为0.05144,优于传统监测手段的0.00632,与数值模拟曲线相关性更强;施工全周期内,整桥各节段受力及沉降变形的监测数据围绕理论值波动,且波动幅度较小,连续梁始终处于安全状态.

To investigate the automatic monitoring technology of key construction nodes and structures of super-large bridges constructed with cantilever,the 0#block radar measurement and control,the settlement monitoring of construction sections and the mechanical response monitoring of whole bridge were carried out during the deformation and stress stages of the cantilever construction bridge section.The measurement and control data of stress and deformation in actual construction and simulation data were compared and analyzed,and the safety state of bridge section during construction was judged by the coincidence.By the mathematical statistics method,the accuracy of radar monitoring data was compared with that of traditional monitoring data.The research results show that radar monitoring can work around the clock and can analyze typical fluctuations in cloud images in combination with construction logs.The fitting value of millimeter-wave radar monitoring block 0#deformation data is 0.05144,which is better than 0.00632 of the traditional monitoring method and has stronger correlation with the numerical simulation curve.During the whole construction period,the monitoring data of the force and deformation of each segment of the whole bridge fluctuate around the theoretical values with small fluctuation range,and the continuous beam is always in safe state.