TWO-THIRDS SCALE SHAKE TABLE TESTING AT E-DEFENSE IN MIKI, JAPAN
In August 2009 shake table tests on a two-thirds scale three-story controlled rocking frame were performed at E-Defense. Tests focused on a two-dimensional frame sandwiched between isolated test bed structures that laterally brace the planar specimen and transfer inertial forces to the frame. This experimental program will further validate the controlled rocking system and demonstrate the ability of the system to self-center after an earthquake. To extend the applicability of this research project, a single rocking frame configuration will be tested.
E-Defense Testing Team, August 10, 2009 after the 65% JMA Kobe MCE Ground Shaking:
Back Row (L-R): Matsuoka, Asari, Nakashima, Takeuchi, Hajjar, Krawinkler, Deierlein, Midorikawa, Kasai, Hikino
Front Row (L-R): Eatherton, Ji, Ma, Oobayashi, Yamazaki, Kishiki, Yamamoto, Matsui (missing: Billington)
Overview of Specimen Under Construction at E-Defense as of August 1, 2009
Overview of Specimen Just Prior to Initial Testing
Load Cells at Each Floor Level Measure Story Shear
Fuse A0 in Place Prior to Testing
Horizontal Actuators on the E-Defense Shake Table (Controlled Rocking Shaking Direction)
E-Defense Control System and Control Personnel
E-Defense Synchronized Video Display and Data Interpretation Center
Controlled Rocking Team Interprets the Data: Faculty and Students from Stanford University, University of Illinois, Tokyo Institute of Technology, Hokkaido University, and Researchers from NIED
Completed Tests
Four two-thirds scale tests tests at E-Defense in Japan were conducted on for August 10, 14, 19, and 24, 2009.
View Video from E-Defense Experiments
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Synchronized streaming playback video is available to review from the E-Defense testing series (best viewed at 1024x768 or 1280x1024 screen resolution):
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Specimen A1: Specimen with Fuse A1 Subjected to 65% JMA-Kobe (Maximum Considered Earthquake)
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Highlights of Recent Results
65% of JMA/Kobe: Maximum Considered Earthquake
August 10, 2009
Roof Drift Ratio and Uplift Ratio vs. Time
Overturning Moment vs. Roof Drift Ratio
Restoring Moment from Fuse and PT vs. Roof Drift Ratio
Post-Tensioning Force vs. Time
Fuse Shear Force (Normalized by Fuse Design Strength) vs. Fuse Shear Drift Ratio
46% of JMA/Kobe Design Basis Earthquake
August 7, 2009
Roof Drift Ratio and Uplift Ratio vs. Time
Overturning Moment vs. Roof Drift Ratio
Restoring Moment from Fuse and PT vs. Roof Drift Ratio
Post-Tensioning Force vs. Time
Fuse Shear Force (Normalized by Fuse Design Strength) vs. Fuse Shear Drift Ratio