Development and Splice Lengths for High-Strength Reinforcement

Research purpose

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:

Purdue University
Project Area
Structural Engineering
CPF research grant #
Award amount
Grant period
Jan 2017 - Sep 2018
Grant Status
In Progress
Principal Investigator
Robert Frosch, Professor, Purdue University
Industry champions

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

CPF allies
Research deliverables

Progress Report I
Progress Report II
Final Report