Laser-Based Instrumentation for Bridge Load Testing

A Transducer for Measuring Tensile Strains in Concrete Bridge Girders

“…One end of these devices needs to be anchored to a non-moving object, usually the ground. Laser [3] and photogrammetric [4] devices measure vertical deflections and do not require anchorage to the ground, an advantage when the bridge section measured is over water or traffic. Some researchers have measured the dynamic response of a bridge [5,6] for the purpose of detecting damage or deterioration (indicated by a change in dynamic response.…”

Workshop on quantitative tools for condition assessment of aging infrastructure :

“…Fuchs described an existing FHWA program to implement a laser system that could measure bridge deflections during fabrication [Fuchs 2004]. The discussion in the breakout session centered on the entire laser system.…”

Laser Scanning Technology for Bridge Monitoring

“…By comparing the position change of the scan points at each measurement location, deflection of bridge component can be measured. Fuchs et al (2004a and2004b) reported using LiDAR for displacement measurements during several bridge static load tests. However, to monitor multiple lines of a bridge during a load test, their laser needed to be placed at multiple locations manually.…”