Technical Report Documentation Page 1. Report No. 2. Government Accession No. 3. Recipient's Catalog No. FlfVV)V1J(-99/1364-2 4. Title and Subtitle 5. Report Date AN EVALUATION OF REPAIR METHODS August 1998 FOR CANTIEVER BRIDGE PIERS 6. Perfonning Organization Code 7. Author(s) 8. Perfonning Organization Report No. Susan E. Scott, Brad Wood, and Michael E. Kreger Research Report 1364-2 9. Perfonning Organization Name and Address 10. Work Unit No. (1RAIS) Center for Transportation Research 11. Contract or Grant No. The University of Texas at Austin Research Study 0-1364 3208 Red River, Suite 200 Austin, TX 78705-2650 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Texas Department of Transportation Interim Research and Technology Transfer Office P.O. Box5080 Austin, TX 78763-5080 14. Sponsoring Agency Code 15. Supplementary Notes Study conducted in cooperation with the U. S. Department of Transportation, Federal Highway Administration. Research study title: "Design of Large Structural Members Utilizing Partial Prestressing" 16. Abstract In an earlier phase of Project 1364, during the process of testing reduced-scale cantilever bent specimens that were models of selected bents used in the San Antonio Y Project, a flaw in reinforcement details was discovered in the joint region of several cantilever bents. The two types of bents that contained this detailing flaw included reinforced concrete bents and bents utilizing post-tensioning in the overhang. Due to inadequate anchorage of longitudinal reinforcement in the column of the post-tensioned bents and in the column and overhang of the reinforced-concrete bents, tensile forces in the column and overhang were not able to be transferred through the joint once loads imparted by the superstructure reached slightly more than service level. A number of repair schemes were developed to remediate this problem in both the reinforced and post- tensioning bents. The most promising of these schemes (namely, external vertical post-tensioning external diagonal post-tensioning, and internal vertical post-tensioning) were fabricated and installed on the damaged reduced-scale cantilever bents, then were tested to factored loads I lj). All tested repair schemes resisted the maximum test load with no indications of distress. Results of the load tests are presented, and the tested repair schemes are evaluated based on serviceability, cost, constructibility, apparent durability, and aesthetics. 17. Key Words 18. Distribution Statement Bridge repair, cantilever bridge piers, No restrictions. This document is available to the public through reinforced concrete bents, cantilever bents the National Technical Information Service, Springfield, Virginia 22161. 19. Security Classif. (of report) 20. Security Classif. (ofthis page) 21. No. of pages 22. Price Unclassified Unclassified 170 Fonn DOT F 1700.7 (8-72) Reproduction of completed page authorized
An Evaluation of Repair Methods for Cantilever Bridge Piers
May 19, 2023
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