PROJECT

GRANTEE

PROJECT AREA

GRANT #

AWARD AMOUNT

GRANT PERIOD

GRANT STATUS

PRINCIPAL INVESTIGATOR

INDUSTRY CHAMPIONS

CPF ALLIES

RESEARCH PURPOSE

RESEARCH DELIVERABLES

Foundation Mats with High Strength Steel Reinforcement

University of California, Berkeley

Structural Systems

01-19

$230,044

January 2019 - January 2021

In Progress

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

David Fields, MKA

Michael Collins, UToronto

Neil Hawkins, UIUC

Dominic Kelly, SGH

American Concrete Institute Foundation

Concrete Reinforcing Steel Institute Education and Research Foundation

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.

Deliverable 1, Interim report on beam tests 1 and 2

Deliverable 2, Interim Report on Numerical Modeling

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