High Strength Reinforcing Steel Bars: Concrete Shear Friction Interface

High-strength steel (HSS) reinforcement, specifically ASTM A706 Grade 80 (550), is now permitted by the AASHTO LRFD Bridge Design Specifications for use in reinforced concrete bridge components in non-seismic regions. Using Grade 80 (550) steel reinforcement instead of Grade 60 (420) steel reduces material and construction costs. However, state highway agencies (SHAs) only allow Grade 80 (550) reinforcing steel in bridge structural elements that are not expected to undergo large strain reversals. The American Association of State Highway and Transportation Officials (AASHTO) and SHAs have concerns with using Grade 80 (550) reinforcement in elements designed for concrete shear interfaces experimental data and currently limit the design value to the yield value of the Grade 60 (420) reinforcing steel bars. The report presents research developed to date on performance of Grade 80 (550) steel in resisting interface shearing actions, which is critical for characterizing the performance of precast girders and shear-keys in which Grade 80 (550) reinforcing steel may be used. A push-off test based experimental program was designed using ASTM A706 Grade 60 (420) and Grade 80 (550) reinforcing steel. A total of twenty push-off specimens were constructed and tested to discern if the design can account for the higher strength-steel nominal yield values.

• Record URL:
  http://www.oregon.gov/ODOT/Programs/ResearchDocuments/SPR762_Part_A_ConcreteShearFrictionInterface.pdf
• 
• Corporate Authors:

  Oregon State University, Corvallis

  Corvallis, OR  United States  97331

  Oregon Department of Transportation

  Research Unit
  555 13th Street NE, Suite 1
  Salem, OR  United States  97301

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Barbosa, André R
  • Trejo, David
  • Nielson, Drew
• Publication Date: 2017-3

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report - Part A
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 129p

Subject/Index Terms

• TRT Terms: Bridge members; Girders; High strength steel; Load and resistance factor design; Material reinforcement; Reinforced concrete bridges; Reinforcing bars; Reinforcing steel; Shear strength
• Identifier Terms: AASHTO LRFD Bridge Design Specifications
• Subject Areas: Bridges and other structures; Design; Highways; Materials;

Filing Info

• Accession Number: 01631426
• Record Type: Publication
• Report/Paper Numbers: FHWA-OR-RD-17-08
• Contract Numbers: SPR 762
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Mar 30 2017 2:27PM