Foundation Mats with High Strength Steel Reinforcement

Foundation Mats with High Strength Steel Reinforcement

There is an increasing economic incentive to use Grade 80 and Grade 100 reinforcing steel in seismic and non-seismic applications. The Charles Pankow Foundation (CPF) has led a coordinated research program to advance the use of high-strength reinforcement in buildings assigned to all Seismic Design Categories. The CPF program has addressed the market for high-strength reinforcement, mechanical properties of high-strength reinforcement, reinforcement detailing requirements, and structural elements including beams, columns, walls, and coupling beams. The goal of this research project is to develop recommendations for the safe and efficient design of thick foundation mats using high-strength reinforcement. These elements are critical to the performance of many buildings. They are also elements where high-strength reinforcement is likely to see extensive use. Previous tests have demonstrated that shear strength is sensitive to (a) thickness of structural member (the so-called size effect) and (b) flexural tension strain and crack width. Foundation mats with high strength reinforcement typically are thick and will have higher average tensile strains and crack widths than foundation mats using Grade 60 reinforcement, leading to questions about available shear strength. This research is to conduct tests on two deep, one-way beams to explore shear strength and minimum shear reinforcement requirements for deep foundation elements using high-strength reinforcement.

• Grant Details

  Project

  Foundation Mats with High Strength Steel Reinforcement

  Grantee

  University of California, Berkeley

  Category

  Concrete

  Subcategory

  High-Strength Rebar

  Grant #

  01-19

  Award Amount

  $280,044

  Grant Period

  January 2019 - July 2023

  Grant Status

  Active

  Principal Investigators

  Jack Moehle, Ph.D. (moehle@berkeley.edu)

  Industry Champions

  David Fields, MKA; Michael Collins, UToronto; Neil Hawkins, UIUC; Dominic Kelly, SGH

  CPF Allies

  American Concrete Institute Foundation, Concrete Reinforcing Steel Institute Foundation

  Supporters

  MKA Foundation

• Resources / Downloads

  In Development

• Related Research

  • 02-19 Normal- and High-Strength Continuously Wound Ties
  • 05-18 Development of Large High-Strength Headed Reinforcing Bars
  • 03-17 Reinforced Concrete Coupling Beams with High-Strength Steel Bars
  • 02-17 Development and Splice Lengths for High-Strength Reinforcement
  • 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