United States Department of Transportation
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Bridge Analysis and Evaluation of Effects Under Overload Vehicles
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2009-12-01
[PDF-410.95 KB]
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Alternative Title:User's Guide: Bridge Analysis and Evaluation of Effects Under Overload Vehicles
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TRIS Online Accession Number:01680746
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Edition:Final Report [09/01/08 - 12/31/09]
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Abstract:Movement of industrial freight infrequently requires special overload vehicles weighing 5 to 6 times the normal legal truck weight to move across highway systems. The gross vehicle weight of the overload vehicles frequently exceeds 400 kips while the normal interstate legal limit for gross vehicle weight is 80 kips. Examples of the loads carried by the vehicles are pressure vessels and transformers used in power plants, huge boilers, military hardware, beams and barges. Transportation agencies are asked to provide special permits for these vehicles along a specified pathway. Because of the unusual configuration of the vehicles it is difficult for those agencies to evaluate the effect of the vehicles on highway bridges. It is a time consuming job for the local agency since simple analysis methods for determining effects on bridges subjected to those overloads are not well established and the possibility of errors in estimating the impact of the loads on these structures could affect safety. A user’s guide, with example calculations, is provided here to apply the simple method of calculating forces induced in the girders of multi-girder bridges by overload vehicle in both single trailer and dual trailer configurations.
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