1'. Report No. 2. Government Accession No. FHWA/TX-78/07+l96-lF 4. Title and Subtitle DESIGN OF REINFORCEMENT FOR NOTCHED ENDS OF PRESTRESSED CONCRETE GIRDERS 7. Author' 5) Gangadharan Menon and Richard W. Furlong 9. Performing Organization Name and Address TECHNICAL REPORT STANDARD TITLE PAGE 3. Recipient's Catalog No. 5. Report Dote Augus t 1977 6. Performing Organi zation Code B. Performing Organi zotion Report No. Research Report 196-lF 10. Work Unit No. 11. Contract or Grant No. Research Study 3-5-76-196 Center for Transportation Research The University of Texas at Austin Austin, Texas 78712 13. Type of Report and Period Covered 12. Sponsoring Agency Name and Addreu Texas State Deparbment of Highways and Public Transportation; Transportation Planning Division P. O. Box 5051 Final 14. Spon.oring Agency Code Austin, Texas 78763 15. Supplementary Notes study conducted in cooperation with the U. S. Deparbment of Transportation, Federal Highway Administration. Research Study Title: "Optimum Reinforcement for Notched Ends of Prestressed Concrete Girders" 16. Abstract This study was intended to analyze the shear strength of the notched ends of prestressed concrete girders and to evaluate the ultimate shear capacity by testing a model with reinforcing details simpler than those currently adopted in practice. Various discrete element analyses by a computer program showed that it is possible to identify the most highly stressed regions of an end block and also to predict a likely crack pattern that would occur before failure. One specimen with two different end block details was tested to failure. The failure of the specimen did not occur at either notch, and the notch capacity with uncongested reinforcement was shown to be adequate for the intended load. The end block with the provision of a hanger strap assembly and reinforcement welded to the bearing plate behaved well during the test. As concluded from the observation of crack widths, such a design with hanger straps seems to possess a higher degree of serviceability than a design based on the provision of large web plates embedded at the notched end. A design procedure derived from two potential failure modes has been suggested. The two failure modes involved are (a) a shear friction separation parallel to the inclined hanger strap reinforcement and (b) a shear compression separation from the corner of the notch into the flexural compression zone of the end block. An exam- ple design for the end block of a standard highway bridge stringer has been given to illustrate the design procedure. 17. Key Word. prestressed concrete, girder, notched ends, shear strength, reinforcement, hanger strap assembly lB. Distribution Statement No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161. 19. Security Clallif. (of thi. report) 20. Security Clouif. (of thi s page) 21. No. of Page. 22. Price Unc lass ified Unc lass ified 166 Form DOT F 1700.7 le-69)
DESIGN OF REINFORCEMENT FOR NOTCHED ENDS OF PRESTRESSED CONCRETE GIRDERS
Jun 18, 2023
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