DETECTION OF WIND-INDUCED RESPONSE BY WAVELET TRANSFORMED GPS SOLUTIONS

Global positioning system (GPS) solutions offer direct measurements for the dynamic monitoring of long-span and tall civil structures. Timely and correct interpretation of the solutions is essential to improve monitoring and reduce the number of false alarms. This paper develops a new approach that employs the principal component analysis (PCA) of wavelet transformed GPS solutions to detect out-of-control signals. The methodology consists of prefiltering the original GPS solutions via finite infinite response median hybrid (FMH) filter and applying the PCA to Haar wavelet transform of FMH-filtered results. It has been tested off-line using observation data from a tall structure monitoring experiment involving GPS and multisensors. Observation data were collected for about 7 days in February 2000, including 2 strong wind periods. The PCA control chart of the wavelet transformed solutions was found to respond better to the wind periods as compared with that of the "raw" solutions. The proposed method can be applied to monitor wind/earthquake or thermally induced responses in the long-term deformation monitoring of large engineering structures by GPS.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339453
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • OGAJA, C
  • Wang, J
  • Rizos, C
• Publication Date: 2003-8

Language

• English

Media Info

• Features: Appendices; Figures; Photos; References;
• Pagination: p. 99-104
• Serial:
  • Journal of Surveying Engineering
  • Volume: 129
  • Issue Number: 3
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9453
  • Serial URL: http://ascelibrary.org/journal/jsued2

Subject/Index Terms

• TRT Terms: Bridge management systems; Dynamic structural analysis; Global Positioning System; Long span bridges; Sensors; Surveying methods and processes; Wavelets; Wind pressure
• Subject Areas: Bridges and other structures; Design; Highways; Planning and Forecasting; I21: Planning of Transport Infrastructure; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00961634
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 6 2003 12:00AM