基于升降轨SAR数据的连续箱梁桥精细变形
Detailed Deformation of Continuous Box Girder Bridge Based on Ascending and Descending SAR Data
魏恋欢 1王啸天 1敖萌 1李鑫1
作者信息
- 1. 东北大学 资源与土木工程学院,辽宁 沈阳 110819
- 折叠
摘要
针对桥梁精细变形监测问题,提出一种考虑由温度引起的桥梁变形(简称温度变形)的升降轨合成孔径雷达(synthetic aperture radar,SAR)数据融合方法.首先,以连续箱梁桥为研究对象,分别使用升降轨SAR数据集,基于小基线子集干涉测量法(small baseline subsets interferometric SAR,SBAS-InSAR)提取视线向(line-of-sight,LOS)变形;然后,利用最小二乘法构建温度变形模型,分离周期性温度变形与长期性趋势变形;最后,结合桥梁结构特征,基于时空插值和奇异值分解方法实现升降轨数据融合,提取温度变形、纵桥向(即桥梁延伸方向)及垂直向趋势变形,分析桥梁变形机制及变形成因.结果表明,该方法可提取精确的桥梁温度变形及三维变形,为桥梁健康监测提供可靠的方法支撑.
Abstract
An approach was presented for detailed deformation monitoring of bridges,by fusing ascending and descending synthetic aperture radar(SAR)data while considering deformation caused by temperature change(named as thermal deformation).Firstly,taking a continuous box girder bridge as an example,the ascending and descending SAR datasets are analyzed based on small baseline subsets interferometric SAR(SBAS-InSAR)to extract line-of-sight(LOS)deformation.Then,thermal deformation model of the bridge is established based on least squares method to separate the periodic thermal deformation and long-term trending deformation.Finally,by combining the structural characteristics of the bridge,fusion of the ascending and descending data based on space-time interpolation and singular value decomposition is conducted,to extract the thermal deformation,the vertical and longitudinal trending deformation,and the deformation mechanism and causative factors of the bridge is analyzed.The results demonstrate that the proposed approach can extract accurate thermal deformation and three-dimensional deformation of the bridge,providing reliable methodological support for bridge health monitoring.
关键词
小基线子集/连续箱梁桥/温度变形建模/数据融合/三维变形Key words
small baseline subsets/continuous box girder bridge/thermal deformation modeling/data fusion/three-dimensional deformation引用本文复制引用
基金项目
国家自然科学基金(42071453)
中央高校基本科研业务费专项(N2201020)
辽宁省地质灾害风险普查项目(2022020700179)
中欧合作龙计划(第五期)(58029)
出版年
2024
NETL
NSTL
维普
万方数据