Load Rating for Standard Bridges – Final Report for TR-785

(2021) Load Rating for Standard Bridges – Final Report for TR-785. Transportation, Department of

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Abstract

In this report, seventeen Iowa secondary and primary bridge standards for three types of bridges are rated utilizing the Load and Resistance Factor methodology and AASHTO BrR Bridge Rating software, Version 6.8.4.3001. Load ratings in this report are in compliance with the AASHTO Manual for Bridge Evaluation, 3rd Edition, with Interim Specifications through 2019, and the AASHTO LRFD Bridge Design Specifications, 8th Edition. All standards were rated as multilane structures with full impact load for design and legal trucks. Permit trucks were rated as Routine or Annual permits, >5000 ADTT in accordance with MBE Table B6A-45. Conducted in cooperation with the U.S. Department of Transportation, Federal Highway Administration. Project TR-785 was sponsored by the Iowa Highway Research Board and the Iowa Department of Transportation. The Iowa Highway Research Board approved expenditures to conduct the engineering study. The engineering determinations for this project were conducted by HGM Associates Inc.