Dr. Kazuhiko Kasai
Professor, Tokyo Institute of Technology
Leader, E-Defense Steel Building Research Projects

E-Defense Full-Scale Experimental Projects on Conventional and Value-Added Steel Buildings


E-Defense is the Japanese full-size three-dimensional vibration destruction facility that is the largest in the world and has been in full operation since January 2005. This presentation discusses the two E-Defense projects on steel buildings. In the Building Collapse Simulation Project, a full-scale 4-story steel building of a conventional type was tested in September 2007 using the E-Defense. It was constructed according to the current design specifications and practice. The project evaluated structural and functional performance of the conventional building type, by examining damage and degradation, as well as complete collapse. The building collapsed under 1.0 times the JR Takatori record, developing a side-sway mechanism in the 1st story. The building design, construction, and the test results will be presented. In the Damper and Isolation Systems Project, full-scale 5-story buildings either passively controlled or base-isolated will be tested in 2008 and later. The test data will be extremely valuable, since little information has been available regarding actual performance of the damper and isolators at a major earthquake, due to the short histories of their implementations. For passive control scheme, five damper types will be considered. Full-scale tests of such dampers as well as those on steel beam-column-gusset subassemblies were conducted in 2007. Mechanisms of the different damper types and experimental behavior, together with analytical simulation will be explained. Various details of the steel subassemblies and their effects on cyclic behavior will be discussed.

Short Biography

Professor Kasai received Ph.D. degree from University of California, Berkeley in 1985. After teaching at Berkeley, Illinois Institute of Technology, and Lehigh University, he became a professor in 1997 at the Structural Engineering Research Center, Tokyo Institute of Technology, JAPAN. Prof. Kasai has been chairing various committees on passive control of buildings and houses in Japan. His areas of interest are steel seismic design, passive control, base isolation, and general dynamic problems.


Tuesday, FEBRUARY 26th, 2008


5:00 PM EST

Viewing Instructions

Click here to watch the archived webcast.

Discussions and Feedback

If you would like to ask questions regarding the topic being presented, you can send an e-mail to mceerwebcast@civil.eng.buffalo.edu during or after the presentation. If time allows, an attempt will be made to convey any questions received during the presentation to the presenter to answer live during discussions. Other questions will be collected and sent to the presenter, whose answers will subsequently be posted on this website.


Seminar sponsored by MCEER Networking and Education Programs, MCEER SLC and hosted by the Department of Civil, Structural and Environmental Engineering and the EERI Student Chapter at UB.


Click the following URL to begin playing the stream if you are having trouble with the viewing console.


Please note that the above link will only be active a few hours before the event is scheduled to begin. An archived version of this webcast will post posted shortly after the seminar is completed. To view the webcast, please make sure you have the latest version of Windows Media Player installed on your computer, visit


Goran Josipovic by email at gj4@buffalo.edu if you have any problems that prevent you from watching this broadcast.