Chapter 5: Other Designs

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Section 1: Widenings

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Design Recommendations

Design guidelines for various elements of new bridges may also be applied to bridge widenings. Complete a load rating and condition survey before plans are started. Ratings must conform to the current edition of the American Association of State Highway and Transportation Officials (AASHTO) Manual for Bridge Evaluation using Load Factor Rating unless otherwise directed by TxDOT. Refer to the Bridge Project Development Manual for additional requirements for load ratings and condition surveys.

Design widened portions for HL93 loading using the AASHTO LRFD Bridge Design Specifications.

Show load rating and design loads on the bridge plan, for example, HS20 (Existing) and HL93 (Widening).


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