Structural Design Standards
The federal bridge inspection regulation (NBIS) — public domain, with its complete structure on BuildSpec — plus the copyrighted material design standards referenced by IBC Chapters 16–23, listed below with links to the publisher.
Material design standards (ACI 318, AISC 360, NDS, TMS 402, ASCE 7) are copyrighted by their publishers, but most offer free read-only access (ACI 318 through ACI, AISC 360 as a free PDF, NDS through AWC). The NBIS is a federal regulation — its complete text is free on eCFR.
National Bridge Inspection Standards→
The National Bridge Inspection Standards (NBIS) are federal regulations (23 CFR 650 Subpart C) that establish requirements for the inspection of all highway bridges on public roads. FHWA published a major update in May 2022 adding risk-based inspection intervals, element-level inspection, load rating, and quality assurance/quality control requirements. The standards ensure the safety of the nation's roughly 620,000 highway bridges.
Additional References
Published elsewhere. These links leave BuildSpec and open on the publisher’s own site — the host for each is shown on the right.