VRX, Inc. is leading two teams of inspectors responsible for condition inspections of the Skylink system, which connects Dallas/Fort Worth International Airport’s airside facilities. Once the world’s largest airport train system, Skylink is a 4.8-mile-long bi-directional loop automated people mover system with 64 trains serving five terminals.
VRX is performing site visits and data collection and analysis. The fracture critical structures inspected included parallel steel box girder structures and parallel built-up I-girder bent caps. Fracture critical members are visually inspected within arm’s reach, with special attention paid to the tension zones, connections and weld details. All fracture critical members are inspected on both sides of the members with the exception of the top face of the top flanges of the girders where the flange is in contact with the deck. Suspected cracks are tested with dye penetrant.
Routine inspections are performed on all concrete elements of 38 fracture critical bridges. Concrete structures and steel box girder structures with three or more girders are inspected using routine, visual inspection procedures. Areas of concrete structures requiring special attention include the bearing corners of inverted T caps and the bearing corners of concrete box girders.
VRX also provides in-service bridge condition inspections for bridge, roadway and taxiway structures located on the airport. Inspections include the requirements for biennial routine inspections in accordance with the National Bridge Inspection Standards (NBIS) requirements and in-depth fracture critical inspection for those structures identified to be fracture critical or to have fracture critical details.