A New Approach for Health Monitoring of Structures: Terrestrial Laser Scanning

This paper presents a new approach for the health monitoring of structures using terrestrial laser scanning (TLS). 3-D coordinates of a target structure acquired using TLS can have maximum errors of about 10 mm, insufficient for health monitoring of structures. A displacement measurement model to improve the accuracy of the measurement is offered. The model is tested experimentally on a simply supported steel beam. Measurements were made using 3 different techniques: 1) linear variable displacement transducers (LVDTs), 2) electric strain gages, and 3) a long gage fiber optic sensor. The maximum deflections estimated by the TLS model are less than 1 mm and within 1.6% of those measured directly by LVDT. Although GPS methods allow measurement of displacements only at the GPS receiver antenna location, the proposed TLS method allows measurement of the entire bridge's deformed shape, and thus a realistic solution for monitoring structures at both structure and member level. Furthermore, it can be used to create a 3-D finite element model of a structural member or the entire structure at any point in time automatically. Through periodic measurement of deformations of a structure/structural member and performing inverse structural analyses with measured 3-D displacements, a structure's health can be monitored continuously.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/10939687
• Authors:
  • Park, H S
  • Lee, H M
  • Adeli, Hojjat
• Publication Date: 2007-1

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 19-30
• Serial:
  • Computer-Aided Civil and Infrastructure Engineering
  • Volume: 22
  • Issue Number: 1
  • Publisher: Blackwell Publishing
  • ISSN: 1093-9687
  • Serial URL: http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1467-8667

Subject/Index Terms

• TRT Terms: Bridge engineering; Finite element method; Lasers; Monitoring; Structural analysis; Structural members; Structural models
• Uncontrolled Terms: Laser scanning
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01042250
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 1 2007 8:37AM