DESIGN CRITERIA FOR OVERHANGING ENDS OF BENT CAPS - BOND AND SHEAR

A PROGRAM OF 36 BENT CAP SECTIONS OF 36-IN. DEPTH WERE TESTED IN AN INVESTIGATION PRIMARILY DIRECTED TOWARD THE BOND AND SHEAR STRENGTHS WHICH SHOULD BE USED IN DESIGN. INTERMEDIATE, A 432, AND A 431 GRADE STEELS WERE USED. EVEN THOUGH THE FINAL FAILURES WERE OFTEN CLASSIFIED AS BOND OR SHEAR, ONLY 8 PERCENT OF THE SPECIMENS FAILED AT LESS THAN CALCULATED FY STEEL STRESS. THE AVERAGE FS DEVELOPED WAS BETWEEN 1. 15FY AND 1. 20FY. IN SHEAR IT WAS FOUND THAT AN ULTIMATE V MUCH HIGHER THAN ALLOWED BY CURRENT SPECIFICATIONS WAS FEASIBLE FOR LOADS PLACED BETWEEN 0.5D AND 1.2D FROM THE SUPPORT. VERTICAL STIRRUPS ADDED NO PERCEPTIBLE STRENGTH BUT HORIZONTAL WEB STEEL WAS EFFECTIVE. IN BOND IT WAS FOUND THAT THE NOMINAL BOND STRESS IN THE LENGTH BETWEEN LOAD AND SUPPORT WAS NOT IMPORTANT, BUT THAT AN END ANCHORAGE DISTANCE BEYOND THE LOAD WAS ESSENTIAL. WITH AN END ANCHORAGE OF 15 IN. FOR NO. 11 BARS OR 12. IN. FOR NO. 8 BARS, THERE SEEMED TO BE NO PROBLEM IN DEVELOPING A 75-KSI STEEL. THE WIDTH OF WEB CRACKS WAS ONLY SLIGHTLY LESS THAN THAT OF FLEXURAL CRACKS ON THE TENSION FACE AND SUGGESTED THE DESIRABILITY OF USING HORIZONTAL STIRRUPS IN THESE CANTILEVER ENDS. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1966/147/147-007.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Concrete Superstructures and presented at the 45th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Ferguson, Phil M
• Publication Date: 1966

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; Photos; Tables;
• Pagination: pp 116-139
• Monograph Title: Bridges and structures
• Serial:
  • Highway Research Record
  • Issue Number: 147
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Anchorages; Bents; Bonds; Cantilevers; Design; Shear strength; Steel; Stirrups; Stresses; Ultimate strength; Webbing
• Uncontrolled Terms: Design criteria
• Old TRIS Terms: End anchorage
• Subject Areas: Bridges and other structures; Design; Highways;

Filing Info

• Accession Number: 00208229
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jan 9 1994 12:00AM