Dynamic effect of truck loads on girder bridges

Hani H. Nassif, Andrzej S. Nowak

Research output: Contribution to conferencePaperpeer-review


The effect of truck loads on bridges is important in the effort of upgrading the transportation infrastructure. The determination of the Dynamic Load Factor (DLF), defined as the ratio of dynamic and static responses, is essential for the development of a new generation of reliability-based bridge design codes. Field measurements are performed to determine the actual variation of the DLF with various truck as well as bridge parameters. The objective of this paper is to present the effects of various parameters, such as truck gross weight, truck speed, truck type, girder static stress, and girder position, on the DLF. The field tests are carried out on four steel girder bridges. Measurements are taken using a weigh-in-motion (WIM) system with strain transducers. For each truck passage, the truck weight, speed, axle configuration, and lane occupancy are determined and recorded. A numerical procedure is developed to filter and process collected data. The DLF is determined under normal truck traffic of various load ranges and axle configurations. In absolute terms, the response due to dynamic load is practically constant and it does not depend on truck weight. However, for exterior girders the static stress is very small which results in large DLF. Therefore, the DLF should be considered based on girders of maximum stress values.

Original languageEnglish (US)
Number of pages5
StatePublished - 1995
Externally publishedYes
EventProceedings of the 1995 4th International Symposium on Heavy Vehicle Weights and Dimensions - Ann Arbor, MI, USA
Duration: Jun 25 1995Jun 29 1995


OtherProceedings of the 1995 4th International Symposium on Heavy Vehicle Weights and Dimensions
CityAnn Arbor, MI, USA

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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