Which bridge elements must be inspected under NBIS?

Which bridge elements must be inspected under NBIS?

• A. Bearings and joints only.
• B. Deck drainage and parapets/rails only.
• C. Deck and wearing surface; substructure; deck drainage only.
• D. Deck and wearing surface; superstructure (beams/girders, trusses); substructure (piers, abutments, foundations); bearings; joints; parapets/rails; deck drainage.

Answer: (D)

Under NBIS, inspections cover all major bridge components that carry loads and transfer forces, not just a subset. The required elements to inspect are deck and wearing surface; the superstructure (beams/girders and, if present, trusses); the substructure (piers, abutments, foundations); bearings; joints; parapets/rails; and deck drainage. This comprehensive scope ensures you’re assessing every part that affects safety and load paths—from the riding surface to the structural members that carry and transfer loads, and the devices that allow movement and protect edges. Deck drainage is included because water buildup can drive deterioration across many components, so overlooking it would miss important issues. Other options leave out essential elements like the superstructure, substructure, or deck-related features, giving an incomplete view of bridge condition.

Under NBIS, inspections cover all major bridge components that carry loads and transfer forces, not just a subset. The required elements to inspect are deck and wearing surface; the superstructure (beams/girders and, if present, trusses); the substructure (piers, abutments, foundations); bearings; joints; parapets/rails; and deck drainage. This comprehensive scope ensures you’re assessing every part that affects safety and load paths—from the riding surface to the structural members that carry and transfer loads, and the devices that allow movement and protect edges. Deck drainage is included because water buildup can drive deterioration across many components, so overlooking it would miss important issues. Other options leave out essential elements like the superstructure, substructure, or deck-related features, giving an incomplete view of bridge condition.