Development and Splice Lengths for High-Strength Reinforcement

Development and Splice Lengths for High-Strength Reinforcement

To support the adoption of high strength reinforcement (fy > 60 ksi) into widespread use, it is fundamental that appropriate development and splice lengths be calculated. This need is outline in the roadmap for the use of high strength reinforced as presented in ATC 1151. Designers need an expression that is codified for use in practice. This research will develop a design expression which will be proposed for adoption by ACI 318 and will enable appropriate design and detailing of concrete structures containing high strength reinforcement. The research will address splices for seismic and non-seismic applications. Special attention shall be given to splicing of high- strength reinforcement at the bases of walls for structures required to resist earthquake demands. Current regulations do not allow lap splices in or near plastic hinges in beams and columns, but that is not the case for structural walls. This is of potential concern because 1) designers today rely more on walls and less on frames for lateral resistance and 2) the following issues indicate a need to revisit the subject of lap splices.

• Grant Details

  Project

  Development and Splice Lengths for High-Strength Reinforcement

  Grantee

  Purdue University

  Category

  Concrete

  Subcategory

  High-Strength Rebar

  Grant #

  02-17

  Award Amount

  $260,000

  Grant Period

  January 2017 - April 2020

  Grant Status

  Complete

  Principal Investigators

  Robert Frosch, Santiago Pujol

  Industry Champions

  Ron Klemencic, Magnusson Klemencic Associates; Dominic Kelly, Simpson Gumpertz & Heger; Jack Moehle, University of California, Berkeley

  CPF Allies

  American Concrete Institute Foundation (ACIF), Concrete Reinforcing Steel Institute

• Resources / Downloads

  • Development and Splice Lengths for High-Strength Reinforcement, Volume 1: General Bar Development, 2020
  • Development and Splice Lengths for High-Strength Reinforcement, Volume II: Drift Capacity of Structural Walls with Lap Splices, 2020
  • Presentation with Videos of Development and Splice Lengths for High-Strength Reinforcement, Volume 1: General Bar Development

• Related Research

  • 02-19 Normal- and High-Strength Continuously Wound Ties
  • 01-19 Foundation Mats with High Strength Steel Reinforcement
  • 05-18 Development of Large High-Strength Headed Reinforcing Bars
  • 03-17 Reinforced Concrete Coupling Beams with High-Strength Steel Bars
  • 03-16 Acceptable Elongations and Low-Cycle Fatigue Performance for High-Strength Reinforcing Bars
  • 02-16 Low-Cycle Fatigue Criteria for the Seismic Design of Concrete Structures with High Strength Reinforcing Steel
  • 01-15 Setting Bar-Bending Requirements for High-Strength Steel Bars
  • 06-14 High-Strength Steel Bars in Reinforced Concrete Walls: Influence of Mechanical Properties of Steel on Deformation Capacity
  • 04-14 Performance Characterization of Beams with High-Strength Reinforcement
  • 04-13 Assessment of Yield Stress Measurement Methods for Reinforcing Bars
  • 03-14 Development of Tentative Specification for High-Strength Steel Reinforcing Bar
  • 05-13 The Development Of A Roadmap On The Use Of High- Strength Reinforcement In Reinforced Concrete Design
  • 01-13 The Impact of High-Strength Reinforcing Steel on Current Design Practice
  • 08-11 Anchorage of High-Strength Reinforcing Bars