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Reducing Earthquake Losses: From Research to Practice

Next in Series:  "Seismic Design Methodology for Precast Concrete Floor Diaphragms" on Monday, April 23, 2012, 11:30 AM - 1:00 PM (PDT)

A webinar series cosponsored by the Earthquake Engineering Research Institute
and the George E. Brown, Jr. Network for Earthquake Engineering Simulation

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The Research to Practice webinar series focuses on the outcomes of NEES research and their significance to engineering design and construction.  The content of the webinars are designed to appeal to both practitioners and researchers. Webinars are broadcast every couple of months and are archived here for continued access. Future webinars may be found in the calendar at

"Seismic Design Methodology for Precast Concrete Floor Diaphragms" is the fifth in a series of Research to Practice Webinars co-produced by the Network for Earthquake Engineering Simulation (NEES) and the Earthquake Engineering Research Institute (EERI). The webinar is Monday, April 23, 2012, 11:30 AM - 1:00 PM (PDT).  There is no cost to attend this webinar. To register go to PDHs will be available from EERI after the webinar for $30.

Precast concrete structures are cost-effective and durable systems that are rapidly erected and can accommodate long floor spans within a shallow profile. However, poor performance of precast floor diaphragms in recent earthquakes has limited the widespread use of precast construction. Reliable designs and details for the precast floor diaphragms are required for these systems to open up their use to a wider market.

To address this issue, a five part seismic design methodology for precast concrete floor diaphragms has been developed as part of a large multi-university research project termed the DSDM Project. The DSDM Project was co-funded by the National Science Foundation (NSF) and NEES, the Precast/Prestressed Concrete Institute (PCI), and the Charles Pankow Foundation (CPF). The research, led by the University of Arizona, involved both large-scale structural testing at NEES@Lehigh, and a half-scale shake table test at the NEES@UCSD equipment site. Three dimensional nonlinear dynamic models of precast structures were developed on the basis of the NEES testing. These models were used to establish performance targets and design factors for the design methodology. The research and design methodology development involved strong industry collaboration.

In this presentation, Associate Professor Robert Fleischman of the University of Arizona, Dr. Ned Cleland of Blue Ridge Design, and Dr. S.K. Ghosh of SKG Associates will present the research methods, results, and the main aspects of the design methodology, including a practitioner’s perspective on the design procedure, tools for the design office, cost comparisons and codification efforts.