Chicago — Precast/Prestressed Concrete Institute (PCI) received confirmation from ICC Evaluation Service, LLC (ICC-ES), that its ESR-3010 Precast Concrete Diaphragm seismic design methodology complies with the provisions of the 2012 and 2015 International Building Code.

This confirmation, as evidenced in ICC-ES evaluation report ESR-3010, provides guidance to code officials faced with approving the use of precast concrete diaphragm seismic design methodology under these codes. The evaluation report is based on acceptance criteria for Alternative Seismic Design of Precast Concrete Diaphragms and Qualification of Precast Concrete Diaphragm Connectors (AC468) dated June 2016. The evaluation report is available online at as a complimentary download.

“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,” said Jason Krohn, managing director of Technical Activities, PCI.

In the 2018 International Building Code (IBC), this 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 the use of ICC-ES evaluation report ESR-3010 and the approval of the local code official, a design professional can immediately use this state-of-the-art design methodology for precast concrete diaphragms without waiting until their jurisdiction adopts the 2018 IBC.