东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (3): 391-400.DOI: 10.12068/j.issn.1005-3026.2024.03.011

• 资源与土木工程 • 上一篇    下一篇

基于升降轨SAR数据的连续箱梁桥精细变形

魏恋欢, 王啸天, 敖萌(), 李鑫   

  1. 东北大学 资源与土木工程学院,辽宁 沈阳 110819
  • 收稿日期:2022-10-07 出版日期:2024-03-15 发布日期:2024-05-17
  • 通讯作者: 敖萌
  • 作者简介:魏恋欢(1986-),女,辽宁沈阳人,东北大学副教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(42071453);中央高校基本科研业务费专项资金资助项目(N2201020);辽宁省地质灾害风险普查项目(2022020700179);中欧合作龙计划五期项目(58029)

Detailed Deformation of Continuous Box Girder Bridge Based on Ascending and Descending SAR Data

Lian-huan WEI, Xiao-tian WANG, Meng AO(), Xin LI   

  1. School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China.
  • Received:2022-10-07 Online:2024-03-15 Published:2024-05-17
  • Contact: Meng AO
  • About author:AO Meng, E-mail: aomeng@mail.neu.edu.cn

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.

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

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.

Key words: small baseline subsets, continuous box girder bridge, thermal deformation modeling, data fusion, three-dimensional deformation

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