Monitoring in combination with proof- and high magnitude load testing can evaluate potentially higher load carrying capacities in existing bridges. However, such in-situ testing provides challenges like limited test-time, difficult calibration under in-situ conditions etc. Consequently, in-situ load-testing significantly amplifies the requirements to monitoring. This paper focuses on results from in-situ DIC-monitoring. The method was used to evaluate deformations- and crack initiation on large concrete bridge surfaces during high magnitude load-testing. DIC-measurements are very susceptible to light, surface texture and contrast, etc. Laboratory testing and preliminary site inspections were done to investigate the measurement conditions. Monitoring was executed with conventional- and wide-angle lens DSLR-cameras positioned underneath the bridge, measuring vertically to the surface. The 2D output from the DIC-software was corrected for wide-angle lens distortions and out-of-plane deflections. The method seems desirable for a more generic use, and has potential for the evaluation of stop criteria.
|Title of host publication||Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges : Proceedings of the Ninth International Conference on Bridge Maintenance, Safety and Management|
|Publication status||Published - 2018|
|Event||9th International Conference on Bridge Maintenance, Safety and Management - Melbourne, Australia|
Duration: 9 Jul 2018 → 13 Jul 2018
Conference number: 9
|Conference||9th International Conference on Bridge Maintenance, Safety and Management|
|Period||09/07/2018 → 13/07/2018|
Halding, P. S., Schmidt, J. W., & Christensen, C. O. (2018). DIC-monitoring of full-scale concrete bridge using high-resolution wide-angle lens camera. In Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges : Proceedings of the Ninth International Conference on Bridge Maintenance, Safety and Management (pp. 1492-1499). CRC Press.