United States Department of Transportation
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Load Rating TxDOT Pre-1980 In-Service Culverts: Model Enhancements, Procedure Improvements, and Results for 1,000 Structures
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2016-12-01
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[PDF-7.81 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
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Abstract:This report presents research findings associated with performing load-rating calculations and analyses for 1,000 culvert structures which constitute a statistically-representative sample of Texas Department of Transportation (TxDOT) pre-1980, on-system, bridge-class, cast-in-place, reinforced concrete box culvert structures. Work centered around three key themes: (1) the introduction and validation of several enhancements into TxDOT’s Level 3 (soil-structure interaction) culvert rating analysis model to improve load rating accuracy and precision, (2) establishing an improved procedure for culvert load rating based on lessons learned from working through the trial set of load ratings for 1,000 culverts at the system level, and (3) performing approved Level 1 and Level 3 load ratings for 1,000 culverts to reflect the enhanced model and improved load rating process. In all cases, the starting place for further work was the initial load rating procedure articulated in TxDOT’s Culvert Rating Guide developed in research project 0-5849, and the numerical algorithms represented in Version 1.0 of TxDOT’s CULVLR software created through TxDOT implementation projects 5-5849-01 and 5-5849-3. As a result of this study, both the Culvert Rating Guide and the CULVLR software are slated for revision. Final load rating results indicate operating ratings greater than or equal to HS-20 for 82% to 92% (±2%) of TxDOT’s population of pre-1980 culvert structures.
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