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LIVE LOAD MODELS FOR BRIDGE EVALUATION

Andrzej S. Nowak, John M. Kulicki

Open publisher page 2 citations

Abstract

The paper deals with the development of live load models for Load and Resistance Factor Design (LRFD) bridge design and evaluation code. The statistical data is based on the available truck surveys. Distribution functions are derived for moments and shears. The distribution functions are extrapolated to calculate maximum moments and shears for longer time periods, up to 75 year life time for a newly designed bridge. A live load model is derived for one lane and multi-lane bridges. For two lane bridges, the maximum load effect is caused by two fully correlated trucks, side-by-side in adjacent lanes. The maximum 75 year moment in a girder is caused by two maximum 1.5 month trucks. Each such a truck is about 0.85 of the maximum 75 year truck. The derived live load model is verified by comparison to the extreme truck configurations allowed on the highways in various states. (A) For the covering abstract of the conference see IRRD 850834.

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What this paper is about

The paper deals with the development of live load models for Load and Resistance Factor Design (LRFD) bridge design and evaluation code. The statistical data is based on the available truck surveys. Distribution functions are derived for moments and shears. The distribution functions are extrapolated to calculate maximum moments and shears for longer time periods, up to 75 year life time for a newly designed bridge. A live load model is derived for one lane and multi-lane bridges. For two lane bridges, the maximum load effect is caused by two fully correlated trucks, side-by-side in adjacent lanes. The maximum 75 year moment in a girder is caused by two maximum 1.5 month trucks. Each such a truck is about 0.85 of the maximum 75 year truck. The derived live load model is verified by comparison to the extreme truck configurations allowed on the highways in various states. (A) For the covering abstract of the conference see IRRD 850834.

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Available abstract

The paper deals with the development of live load models for Load and Resistance Factor Design (LRFD) bridge design and evaluation code. The statistical data is based on the available truck surveys. Distribution functions are derived for moments and shears. The distribution functions are extrapolated to calculate maximum moments and shears for longer time periods, up to 75 year life time for a newly designed bridge. A live load model is derived for one lane and multi-lane bridges. For two lane bridges, the maximum load effect is caused by two fully correlated trucks, side-by-side in adjacent lanes. The maximum 75 year moment in a girder is caused by two maximum 1.5 month trucks. Each such a truck is about 0.85 of the maximum 75 year truck. The derived live load model is verified by comparison to the extreme truck configurations allowed on the highways in various states. (A) For the covering abstract of the conference see IRRD 850834.

Key concepts: Truck, Structural load, Structural engineering, Bridge (graph theory), Load factor, Moment (physics), Influence line, Engineering

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