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NEES Project Warehouse

Development of Next Generation Adaptive Seismic Protection Systems
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The experiment contains sensor measurements, metadata, and required documentation including experiment report.

Complete - 06/17/2013

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Experiment-2: Apparent-Weakening in Base-Isolated Building
Experiment Type: Shake Table
Description: The Negative Stiffness Device (NSD) is a device that produces a force which is in the same direction as the imposed displacement thus the name a??negative stiffnessa??. The NSD consists of (a) a highly compressed spring that produces the negative stiffness, (b) a magnification mechanism to magnify the negative stiffness, (c) a self-containment system so that the large forces needed for developing the negative stiffness are not resisted by the structure, and (d) a "gap spring assembly" (GSA) mechanism which delays the development of negative stiffness until the structural system undergoes a prescribed displacement. The prototype of the negative stiffness device was designed by researchers at the University at Buffalo (UB), Rice University and Taylor Devices Inc., built at Taylor Devices Inc., and was first tested on a shake table by researchers at UB and Rice University in a three stories structural model isolated with elastomeric bearings.
Dates: July 26, 2010 - October 21, 2011
Facility: State University of New York at Buffalo, NY, United States
Equipment: View Details
Specimen Type: 3 story steel moment resisting frame
Material: Negative Stiffness Device Negative Stiffness Device (view)
Superstructure Superstructure (view)
Low damping elastomeric bearings Low damping elastomeric bearings (view)

Sensors: Sensors of specimen
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Related Documents:
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Tags (keywords):
  1. Negative Stiffness Device
  2. smart isolation
  3. shake table testing
  4. Base isolated structure
Cite this work:
Apostolos Sarlis, Dharma Theja Pasala, Michael Constantinou, Andrei Reinhorn, Satish Nagarajaiah, Douglas Taylor, John Metzger (2013). "Apparent-Weakening in Base-Isolated Building", Network for Earthquake Engineering Simulation (distributor), Dataset, DOI:10.4231/D31Z41S86