Technical Report Documentation Page 1. Report No. FHWA/TX-05/0-4178-1 2. Government Accession No. 3. Recipient’s Catalog No. 4. Title and Subtitle Fatigue Strength of Fillet-Welded Transverse Stiffeners with Undercuts 5. Report Date July 2002 Revised October 2004 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. Joseph R. Spadea and Karl H. Frank Research Report 0-4178-1 9. Performing Organization Name and Address 10. Work Unit No. (TRAIS) Center for Transportation Research The University of Texas at Austin 3208 Red River, Suite 200 Austin, TX 78705-2650 11. Contract or Grant No. Research Project 0-4178 12. Sponsoring Agency Name and Address Texas Department of Transportation Research and Technology Implementation Office P.O. Box 5080 13. Type of Report and Period Covered Research Report (9/99-8/01) Austin, TX 78763-5080 14. Sponsoring Agency Code 15. Supplementary Notes Project conducted in cooperation with the U.S. Department of Transportation, Federal Highway Administration, and the Texas Department of Transportation 16. Abstract Presently, wrapping of the welds at the ends of stiffeners is not done to avoid the undercutting of the stiffener corners and the attendant weld repair. The fatigue performance of stiffeners with undercuts was evaluated in a factorial design fatigue experiment. Undercuts at the flange edge and filling of the stiffener cope with the fillet weld were also evaluated. The undercuts did not influence the fatigue performance of the stiffener weld even when very large undercuts were purposely introduced. Filling of the cope with a continuous weld and flange undercuts also did not change the fatigue performance of the connection. Wrapping of welds in locations were corrosion at the stiffener to plate interface may occur should be allowed. The undercuts in the stiffener that may result are not of any consequence and may be left in place. Covering the stiffener cope by continuing the fillet weld is an alternate method of sealing the weld. 17. Key Words fatigue, welding, undercuts, stiffener, bridges 18. Distribution Statement No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161. 19. Security Classif. (of report) Unclassified 20. Security Classif. (of this page) Unclassified 21. No. of pages 76 22. Price Form DOT F 1700.7 (8-72) Reproduction of completed page authorized
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