The International Information Center for Structural Engineers

Steel Bridge Design Handbook: Load Rating of Steel Bridges

Authors
D. Mertz.
Year
2012
Book Title or Journal
Steel Bridge Design Handbook
Series
FHWA-IF-12-052
Volume
18
Number of pages
30
Description
Load rating is defined as the determination of the live load carrying capacity of a bridge using as-built bridge plans and supplemented by information gathered from the latest field inspection. Load ratings are expressed as a rating factor or as a tonnage for a particular vehicle. Emphasis in load rating is on the live-load capacity and dictates the approach of determining rating factors instead of the design approach of satisfying limit states. Existing highway bridges are rated to prioritize a bridge owner’s needs, assure the traveling public’s safety, and facilitate the passage of goods. Bridges that cannot safely carry statutory loads, based on a load-rating evaluation, should be load posted, rehabilitated or replaced. This module informs designers of load ratings, and discusses the LRFR methodology used for load rating evaluation.
Tags
Steel Bridge,Load Rating,LRFR,Live-load Capacity

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