Code service validates connection methodology for seismic precast design

Sources: Precast/Prestressed Concrete Institute, Chicago; CP staff

PCI has received ICC Evaluation Service (ICC-ES) confirmation that the new Precast Concrete Diaphragm Seismic Design Methodology complies with 2012 and 2015 International Building Code provisions. The methodology was recognized by the American Society of Civil Engineers earlier this year, and stems from a groundbreaking investigation PCI funded with the National Science Foundation, Network for Earthquake Engineering Simulation and Charles Pankow Foundation.

ICC-ES Evaluation Report ESR-3010 provides guidance to code officials faced with approving the use of Precast Concrete Diaphragm Seismic Design Methodology, and is available as a complimentary download at It is based on acceptance criteria for Alternative Seismic Design of Precast Concrete Diaphragms and Qualification of Precast Concrete Diaphragm Connectors, June 2016.

“With the approval of this evaluation report, the results of a major research program have affected practice by allowing precast concrete diaphragm systems without a topping to be used in regions of high seismicity,” says PCI Managing Director of Technical Activities Jason Krohn. In the 2018 IBC, he adds, the design methodology will be mandatory for precast concrete used as horizontal diaphragms in buildings assigned to Seismic Design Category (SDC) C, D, E or F, and optional in SDC B according to ASCE 7-16. Through ESR-3010 and local-code official approval, design professional can immediately use the design methodology for precast concrete diaphragms without waiting until their jurisdiction adopts the 2018 IBC.

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