Article Article
Monitoring of Sag Deformation in Suspension Bridges Using a 3D Laser Scanner

This study discusses the causes of main cable sag damage on suspension bridges. Although the cable extension caused by the sag is not apparent, it has some important characteristics. One such characteristic is that the cable, being hyperbolic, contains a central region that is strictly level. If an average of points was taken along this central region, inspection accuracy could be increased. With changes in sag, the damage to the cable can be estimated. Three-dimensional (3D) scanners can accurately obtain the cloud points from the main cable of the suspension bridge in real time and in the long term. This, along with visual testing (VT), can be used to verify the study. The results obtained through laboratory and field experimentation in this study were close to the expected theoretical results.

Alampalli, Sreenivas and G. Fu, “Remote Bridge Monitoring System for Bridge Condition,” Report 70, Engineering Research and Development Bureau, New York State Department of Transportation, Albany, New York, 1994. Brown, C., R. Jkaruna, V. Ashkenazi, G. W. Roberts and R. A. Evans, “Monitoring of Structures Using the GPS,” Proceedings of the Institution Civil Engineers, Structural and Buildings, Vol. 134, No. 1, 1999, pp. 97-105. CSMS, Materials Handbook – Steel Material, Chinese Society for Materials Science, 1982. Castellani, A., “The Project for the Bridge over the Messina Strait,” Proceedings of the Conference of Cable Stayed and Suspension Bridge, Deauville, 1994. Chen, K. U. and S. P. Kao, “Tunnel Deformation Detection Using 3-D Laser Scanner,” National Chung Hsing University, Department of Civil Engineering, Masters Dissertation, 2004. Ashkenazi, V., A. H. Dodson, T. Moore and G. W. Roberts, “Monitoring the Movements of Bridges by GPS,” Proceedings of ION GPS, Vol. 2, 16-19 September 1997, pp. 1165–1172. Beer, F. P. and E. R. Johnston, Jr., Vector Mechanics for Engineers Statics 3/e, Boston, Massachusetts, 2003. Gimsing, N. J., Cable Supported Bridges-Concept & Design, John Wiley &Sons Ltd., England, 1997. Guo, J. and S. Ge, “Research of Displacement and Frequency of Tall Buildings Under Wind Load Using GPS,” Proceedings of ION GPS, 1997, pp. 1385–1388. Lin, J.T., Suspension Bridge of Taiwan, National Taiwan Historica, 2002. Nagihara, S., J. Hargis, R. Goss, J. Wright and G. Hill, “Sub-Centimeter- Resolution Digital Topography and Surface Lithology Models Obtained from 3-D Laser Scanner Survey in the South prong Canyon, Texas Panhandle,” CSM-ASPRS Conference and Technology Exhibition, XXII, FIG, Washington, 2002. Ono, N., N. Tonoko and K. Sato, “A Case Study on the Landslide by the 3D Laser Mirroe Scanner,” International Archives of Photogrammetry and Remote Sensing, Vol. XXXIII, Part B5, Amsterdam, 2000, pp. 593–598. Podolny, W., “Current Corrosion Protection Methods for Cable Stays,” IABSE Symposium: Extending the Lifespan of Structures, San Francisco, 1995. PTI, “Recommendations for Stay-Cable Design, Testing and Installation,” Post-Tensioning Institute, Phoenix, 1986. Tennyson, R. C., N. Banthia, E. Rivera, S. Huffman and I. Sturrock, “Monitoring Structures Using Long Gauge Length Fiber Optic Sensors,” Canadian Journal of Civil Engineering, Vol. 34, No. 3, 2007, pp. 422–429.
Usage Shares
Total Views
91 Page Views
Total Shares
1 Tweets
0 PDF Downloads
0 Facebook Shares
Total Usage