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Title
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Earthquake Simulator Testing of Two Damping Systems for Multistory Structures
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Description
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The use of two different types of damping devices to improve the earthquake resistance of buildings is investigated in a program of earthquake simulator testing of a 1/4-scale, nine-story, steel frame model. The devices studied are a constrained-layer viscoelastic shear damper designed using an energy approach, and a friction damper with almost perfectly rectangular hysteresis behavior, for which an iterative nonlinear analysis design method was adopted.
The model was tested with both types of energy absorbers installed and also in moment-resisting and concentrically-braced configurations. Numerous diagnostic and earthquake tests were performed. The large number of tests performed permitted numerous different comparisons of the four structural systems. Responses are compared in terms of accelerations, displacements, interstory drifts, and story shears. Floor response spectra are also evaluated for the moment-resisting frame and the two damped systems.
The damped structures were found to behave similarly to the concentrically-braced frame in terms of displacements, while having accelerations similar to those of the moment-resisting frame. Story and base shears of the damped structures were of the order of those of the moment-resisting frame, and less than those of the concentrically-braced frame. The response· of the two damped systems was very similar for nearly all of the earthquake motions used.
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Creator
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Aiken, Ian D.
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Kelly, James M.
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Publisher
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Wright-Patterson Air Force Base, OH : Wright Laboratory, Flight Dynamics Directorate, Air Force Systems Command
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Date
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1991
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Format
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1 online resource (13 pages) : ill.
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Type
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article
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Abstract
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The use of two different types of damping devices to improve the earthquake resistance of buildings is investigated in a program of earthquake simulator testing of a 1/4-scale, nine-story, steel frame model. The devices studied are a constrained-layer viscoelastic shear damper designed using an energy approach, and a friction damper with almost perfectly rectangular hysteresis behavior, for which an iterative nonlinear analysis design method was adopted.
The model was tested with both types of energy absorbers installed and also in moment-resisting and concentrically-braced configurations. Numerous diagnostic and earthquake tests were performed. The large number of tests performed permitted numerous different comparisons of the four structural systems. Responses are compared in terms of accelerations, displacements, interstory drifts, and story shears. Floor response spectra are also evaluated for the moment-resisting frame and the two damped systems.
The damped structures were found to behave similarly to the concentrically-braced frame in terms of displacements, while having accelerations similar to those of the moment-resisting frame. Story and base shears of the damped structures were of the order of those of the moment-resisting frame, and less than those of the concentrically-braced frame. The response· of the two damped systems was very similar for nearly all of the earthquake motions used.
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Date Issued
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1991-08
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Extent
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13
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Corporate Author
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Earthquake Engineering Research Center, University of California, Berkeley
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Laboratory
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Wright Laboratory
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Report Number
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WL-TR-91-3078 Volume II, pages FCA-1 to FCA-13
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DoD Project
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2401
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DoD Task
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240104
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Distribution Conflict
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No
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Index Abstract
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Contrails only
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Photo Quality
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Not Needed
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Distribution Classification
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1
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Report Availability
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Full text available
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Provenance
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University of Colorado Colorado Springs, Kraemer Family Library
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Identifier
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ADA241312
