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NEES Project Warehouse

Development of Next Generation Adaptive Seismic Protection Systems
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Experimental data are uploaded,necessary documentation and metadata are provided. Experimental setup report is uploaded.

Complete - 05/07/2012

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Experiment-3: Apparent-Weakening in Fixed Base Structures
Experiment Type: Shake Table
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 a??apparent weakeninga??. The negative stiffness device (NSD), used in this study, exhibits nonlinear-elastic negative stiffness behavior; by adding NSD to the elastic structure the resulting structure-device assembly behaves like an elastic-bilinear structure. Peak acceleration and base shear experienced by the structures can be reduced by adding the negative stiffness device and the additional deformations caused due to the reduced stiffness can be contained by adding the viscous damper.
In this experiment, shake-table studies on a three-story fixed-base structure (3SFS) are conducted to demonstrate the concept of a??apparent weakeninga?? in elastic structural systems. Two NSDs and a viscous damper are installed in the first story of 3SFS. To accentuate the advantages of incorporating NSD in structures, responses of three different systems: 3SFS; 3SFS with NSD; 3SFS with NSD and damper; are compared for a suite of ground motions.
Dates: July 21, 2011 - October 14, 2011
Facility: State University of New York at Buffalo, NY, United States
Equipment: View Details
Specimen Type: Three story frame structure (3SFS) (view)
Material: Moment resisting frame Moment resisting frame (view)
Gravity load carrying frame Gravity load carrying frame (view)
Negative stiffness device Negative stiffness device (view)

Sensors: Accelerometers
Strain gages
Load Cells
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Related Documents:
Tags (keywords):
  1. elastic structures
  2. weakening and damping of structures
  3. negative stiffness device
  4. Apparent-weakening
Cite this work:
Dharma Theja Pasala, Apostolos Sarlis, Satish Nagarajaiah, Andrei Reinhorn, Michael Constantinou, Douglas Taylor, John Metzger (2013). "Apparent-Weakening in Fixed Base Structures", Network for Earthquake Engineering Simulation (distributor), Dataset, DOI:10.4231/D3X63B53J