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NEES Project Warehouse

Development of Next Generation Adaptive Seismic Protection Systems
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To compare experiments, please select at most four experiments from the experiment list below.

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  Experiment-1: Experimental study on the Negative Stiffness Device (NSD)
Dates: October 01, 2008 - September 01, 2010
Description: In this experiment, the force-displacement behavior of the negative stiffness device is studied. Two devices are used in this test: NSD-East and NSD-West. The devices are installed in a test-rig and they are subjected to periodic ground motions at different...
Facility: State University of New York at Buffalo, NY, United States
NSD test-rig setup

 Launch

32 Interactive Files
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  Experiment-2: Apparent-Weakening in Base-Isolated Building
Dates: July 26, 2010 - October 21, 2011
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 “negative stiffness”. The NSD consists of (a) a highly compressed spring that produces the negative stiffness...
Facility: State University of New York at Buffalo, NY, United States


  Experiment-3: Apparent-Weakening in Fixed Base Structures
Dates: July 21, 2011 - October 14, 2011
Description: The acceleration and base shear of structures during strong ground motion can be attenuated by achieving bilinear-elastic behavior without any permanent-displacement also referred as “apparent weakening”. The negative stiffness device (NSD), used...
Facility: State University of New York at Buffalo, NY, United States
Schematic diagram of 3SFS with two NSDs and damper installed in the first-floor

 Launch

56 Interactive Files
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  Experiment-4: Experimental Cyclic Testing of Negative Stiffness Device for Application to Bridge Model
Dates: April 03, 2012 - April 10, 2012
Description: In this set of experiments, two NSDs, which are modified for testing inside a bridge model, were tested inside a loadframe, for different harmonic loads with different frequencies and amplitudes.
Facility: State University of New York at Buffalo, NY, United States


  Experiment-5: Apparent-Weakening in a Quarter-scaled Isolated Bridge
Dates: June 18, 2012 - July 17, 2012
Description: The Negative Stiffness Devices, which were modified in the previous experiment, were implemented inside a quarter-scaled highway bridge model and were tested experimentally for many shake table tests of different ground motions with different scales...
Facility: State University of New York at Buffalo, NY, United States
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