Development of Bridge Load Model for LRFD Code

by Andrzej S. Nowak, Univ of Michigan, Ann Arbor, United States,

Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation


The load models are based on the available statistical data on dead load, truck loads and dynamic loads. The paper deals mostly with the static live load. The model is derived from truck surveys, weigh-in-motion measurements and other observations. Simple span moments, shears and negative moments are calculated for various spans. Extreme 75 year loads are determined by extrapolation. The important parameters also include girder distribution factors and multiple presence (more than one truck on the bridge). Multiple presence is considered in lane and side-by-side with various degrees of correlation between truck weights. The maximum load is calculated by simulations.

Subject Headings: Vehicle loads | Maximum loads | Dynamic loads | Bridges | Structural models | Load and resistance factor design | Standards and codes | Dead loads

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