NBIS Bridge Inspections (NBIS: National Bridge Inspection System)
Reinspection of 401 bridges in South Eastern counties of Pennsylvania, on the East coast of the USA. Project consisted of hands-on inspection for structural defects, safety features, functional capacity and waterway adequacy. Reports included findings, conclusions, recommendations, photographs and SI&A (BMS) coding forms, Bridges varied in length from 20 feet to 6 100 feet, with 23 of them over 100 m in length. They are built of concrete and steel. Work included rigging and traffic control. Of particular importance was determining the scour susceptibility of al bridges crossing waterways. Bridges were ranked to establish the order in which detailed scour analyses were completed.
A hanger-pin assembly and fatigue cracking inspection was performed for one structure with 16 assemblies, the I-95 viaduct from Lehigh to Somerset Streets. Hands-on inspection, measurements, and field notes were performed on a monthly basis. The detailed report contained findings and graphics, as well as actual-theoretical steel expansion comparison charts.
Brief Description of Services Provided
- Data collection
- Condition survey with in-depth inspection
- Identification and preparation of detailed sketches for serious deficiencies
- Evaluation of fracture critical members
- Re-evaluation of weight posting (rate analysis)
- Underwater inspection
- Maintenance recommendations
- Preparation of comprehensive inspection report.