Integrated Remote Sensing and Visualization (IRSV) System for Transportation Infrastructure Operations and Management: Phase One, Volume 7, LiDAR Scan for New Bridge Construction and Bridge Model Validation

Field load tests of a newly constructed bridge across interstate highway I-77 in Iredell County, NC, is performed as a demonstration study of the application of remote sensing for construction delivery validation tool. The SR1102 bridge is a hybrid steel girder bridge using both High Performance Steel (HPS) 70W and HPS 100W steel. The negative moment sections of the girders have HPS 100W flanges, whereas other parts of the girder are composed of HPS 70W steel. In order to ensure construction quality, a baseline Finite Element (FE) model was established. This model will be used as future reference for long-term structural performance monitoring. To validate the model, both static and dynamic tests were conducted on the bridge prior to its opening to traffic. Static load test is conducted using standard truck loading. LiDAR scans of the bridge during actual static load have confirmed the displacement estimate using the FE model. The baseline FE model generated was further updated based on the LiDAR scan results. High resolution, ortho and non-ortho flyover aerial photographs have also been collected as a post-construction documentation. The value of using commercial remote sensing for construction delivery validation is discussed in the final summary.