Shear Behavior Of High-Strength Concrete Bridge Girders

Current code provisions limit the compressive cylinder strength that can be used in shear design specifications to 10 ksi, whereas concrete compressive strengths close to twice this level are commercially available in some parts of the country. This limitation is imposed due to a lack of experimental research data from which to extend current design specifications. To address the shear design of High-Strength Concrete (HSC) girders, the National Cooperative Highway Research Program (NCHRP) has funded Project 12-56 “Application of the LRFD Bridge Design Specifications to High-Strength Structural Concrete: Shear Provisions” which is being lead by the authors. In the experimental component of this project, approximately twelve 52-foot long and 6-foot deep prestressed concrete bridge girders are being subjected to a uniformly distributed load until shear failure occurs. The primary variables in this study are concrete strength (ranging from 10-18 ksi), shear design stress (700 to 2500 psi), strand anchorage details (straight, unbonded, and draped), and end reinforcement detailing (bar size, spacing, confinement). The experiments on the first four girders have enabled a comparisons between girders with draped and straight strands, girders with enhanced end reinforcement detailing, and girders made from 10 ksi and 14 ksi concrete.

• Corporate Authors:

  National Concrete Bridge Council

  Portland Cement Association, 5420 Old Orchard Road
  Skokie, IL  United States  60077-1083
• Authors:
  • Kuchma, Daniel A
  • Kim, Kang Su
  • Nagle, Thomas
  • Sun, Shaoyun
  • Hawkins, Neil M
• Conference:
  • The 2004 Concrete Bridge Conference
  • Location: Charlotte NC, United States
  • Date: 2004-5-17 to 2004-5-18
• Publication Date: 2004

Language

• English

Media Info

• Media Type: CD-ROM
• Features: Figures; Photos; References; Tables;
• Pagination: 12p
• Monograph Title: Building a New Generation of Bridges

Subject/Index Terms

• TRT Terms: Bridge design; Compressive strength; Concrete bridges; Girders; High strength concrete; Prestressed concrete; Shear properties; Shear strength
• Identifier Terms: AASHTO LRFD Bridge Design Specifications
• Subject Areas: Bridges and other structures; Design; Highways; Materials; I24: Design of Bridges and Retaining Walls; I32: Concrete;

Filing Info

• Accession Number: 01036296
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 27 2006 8:14AM