Reducing Earthquake Losses: From Research to Practice
A webinar series cosponsored by the Earthquake Engineering Research Institute
and the George E. Brown, Jr. Network for Earthquake Engineering Simulation
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 nees.org
Webinars
- Seismic Design Methodology for Precast Concrete Floor Diaphragms (April 23, 2012)
Associate Professor Robert Fleischman - University of Arizona, Dr. Ned Cleland - Blue Ridge Design, Dr. S.K. Ghosh - SKG Associates - Improving the Seismic Performance of Concentrically Braced Frames: Proposed Design and Analysis Procedures (Feburary 15, 2012)
Professors Charles Roeder and Dawn Lehman - University of Washington - Shear Wave Velocity Profiling and its Importance in Seismic Design (December 14, 2011)
Professor Ken Stokoe - University of Texas, Austin and Ivan G. Wong - Principal Seismologist, URS Corporation - Lessons from Chile: Impacts on Earthquake Engineering of Concrete Buildings in the U.S, (July 15, 2011)
Professor John Wallace - University of California, Los Angeles and Assistant Professor Leonardo Massone - University of Chile, Santiago - Performance-Based Seismic Design of Mid-Rise Light-Frame Wood Buildings (January 14, 2011)
Professor John van de Lindt - University of Alabama and Steve Pryor - Simpson Strong-Tie
Click the "Play" button to view each video. The "Fullscreen" button ( 
) on the video player's control bar will expand the video to fill your monitor.
Concentrically braced frames (CBFs) are practical and economical for seismic design, but the inelastic performance of CBFs is more complex and less well understood than many other structural systems. The NEESR small group research project, International Hybrid Simulation of Tomorrow's Braced Frame Systems, investigated these issues using experimental and analytical research methods. The results were combined to develop a new design method that balances the inelastic action within the CBF.
Further Exploration:
- Project Warehouse International Hybrid Simulation of Tomorrow's Braced Frame Systems
NOTE: IN THE VIDEO ABOVE, THE FIRST SLIDE DOES NOT ADVANCE FOR SEVERAL MINUTES. YOU DO NOT NEED TO ADJUST YOUR BROWSER.
Shear-wave profiling can be performed using a range of techniques including borehole methods. Surface-wave methods have become increasingly used because they are nonintrusive, economic and require the least field time. SASW (spectral-analysis-of-surface-waves) and MASW (multi-channel-analysis-of-surface-waves) methods are the two most popular. The presenters discuss the importance of shear-wave velocity profiling in seismic design, its uses, misuses and uncertainties.
The February 27, 2010 Chile earthquake was not only of very large magnitude (Mw 8.8), but also long in duration and strongly felt over a vast region. Thousands of structures designed and built to codes and standards similar to those used in the U.S. were tested by the earthquake. This webinar focuses on the performance of mid-rise concrete buildings by reviewing the test results, changes to the Chilean building code resulting from new knowledge, and implications for U.S. codes and standards.
This webinar summarizes key findings of the NEESwood project, suggested design approaches, and code implications. Findings address effects of nonstructural finishes on behavior, hold-down forces and elongation, inter-story drift limits, and accidental torsion. The discussion of the proposed design approach includes direct displacement design, use of numerical methods, rigid body calculations and diaphragm design.
Further Exploration:
- Project Warehouse Development of a Performance-Based Seismic Design Philosophy for Mid-Rise Woodframe Construction
- Project Warehouse Development of a Performance-Based Seismic Design Philosophy for Mid-Rise Woodframe Construction (Capstone test)
- Project Reports NEESwood
- Project Tests NEESwood
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.
