United States Department of Transportation
i
Structures Research On Call Services: Task 1 Final Report - Assessment of the Load Rating of Bridges with a Load Rating Factor Greater Than 1.35 to Meet Specialized Hauling Vehicle Requirements
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2019-01-01
[PDF-2.60 MB]
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Abstract:The statistical study considered real bridges in Ohio with a rating factor (RF) ≥ 1.35 whose section properties may vary along the length of the bridge. A sample of these bridge was examined. The sample included a minimum of thirty bridges of the each of the six common types studied. No actual bridge was found to have an SHV RF < 1.00. To extend the study the ratio of the Ohio legal RF to the SHV RF was calculated for all bridges in the sample. Three simple span bridges whose spans were from 70 - 80 ft. had a ratio greater than 1.35. The maximum ratio was 1.37. Because the sample size of a statistical study is limited, a parametric study of single and multi-span bridges was conducted. The parametric study considers live load effects on a hypothetical bridge with uniform stiffness and addresses all practical spans for simple span bridges and all practical ratios on interior to exterior spans for multi-span bridges. The maximum span length considered for simple and multi-span bridges was 200 ft. For simple span bridges, the highest ratio of RFs was 1.36 for an 80 ft. span. For multi-span bridges, the highest ratio of RFs for positive moment and negative moment was 1.35 and 1.37, respectively. Shear did not govern in the parametric study for any bridges. The consistency of the statistical and parametric studies shows the general applicable of the parametric model.
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