Displacement Monitoring of I-35W Saint Anthony Falls Bridge with Current Vibration-Based System

Since the opening of the I-35W Saint Anthony Falls Bridge in 2008, over 500 sensors have been collecting data to better understand the behavior of post-tensioned concrete box girder structures. Recent research in the accelerometers installed on the bridge indicates they can be effectively used in a vibration-based structural health monitoring system, but previous studies have shown that natural frequency alone may not be sufficient to determine the performance of the structure. Vertical displacements were believed to be a simpler performance measure as direct comparisons can be made with design calculations and maintenance guidelines. To avoid the shortcomings of conventional displacement measurement options, this study focuses on using the currently installed accelerometers to estimate the vertical displacements of the southbound bridge. The proposed technique utilizes up-to-date modal parameters within a dual Kalman filter to estimate the vertical displacements of the structure from noisy acceleration measurements. When applied to the I-35W Saint Anthony Falls Bridge, it was found that the dual Kalman filter approach captures only dynamic displacements due to relatively slow loading (e.g., traffic loading and thermal loading) and the corresponding low-frequency static displacements are likely too small for GPS measurements due to the high stiffness of the structure.

• Record URL:
  • https://hdl.handle.net/20.500.14153/mndot.3169
• 
• Corporate Authors:

  University of Minnesota, Twin Cities

  Department of Civil, Environmental and Geo-Engineering
  500 Pillsbury Drive SE
  Minneapolis, MN  United States  55455

  Minnesota Department of Transportation

  Minnesota Local Road Research Board
  Research Services & Library, 395 John Ireland Boulevard, MS 330
  St. Paul, MN  United States  55155-1899
• Authors:
  • Brown, Riley J
  • Gaebler, Karl O
  • Shield, Carol K
  • Linderman, Lauren E
• Publication Date: 2019-1

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 72p

Subject/Index Terms

• TRT Terms: Accelerometers; Box girder bridges; Dislocation (Geology); Estimation theory; Kalman filtering; Sensors; Structural health monitoring; Vibration
• Identifier Terms: Interstate 35W Bridge
• Geographic Terms: Saint Anthony Falls (Minnesota)
• Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation;

Filing Info

• Accession Number: 01696156
• Record Type: Publication
• Report/Paper Numbers: MN/RC 2019-05
• Contract Numbers: (c) 99008 (wo) 237
• Files: TRIS, ATRI, STATEDOT
• Created Date: Feb 26 2019 9:41AM