Overweight Trucks and Safety of Bridges

by Gongkang Fu, New York State Dep of Transportation, Albany, United States,
Osman Hag-Elsafi, New York State Dep of Transportation, Albany, United States,

Document Type: Proceeding Paper

Part of: Structures Congress XII


Most states face increasing pressure to issue more and heavier overweight truck permits. Current permit checking methods of many states adopt the AASHTO rating concept with or without an overstress criterion. However, the AASHTO rating procedure is intended to cover only normal traffic, and the basis of these overstress criteria has not been well documented. In this paper, first current practice of overweight permit checking in New York State is reviewed. Development of an overload-permit checking procedure is then attempted, based on uniform bridge safety. Weigh-in-motion data and New York State permit data are used to model live load effects. Annual and trip permits are covered. With a general load-resistance-factor (LRF) checking procedure proposed to account for low appearance frequencies of overweight trucks, future steps towards its implementation are also discussed.

Subject Headings: Trucks | Permits | Load and resistance factor design | Structural safety | Vehicle loads | Ratings | Live loads | New York | United States

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