Noniterative Optimization Procedure for Seismic Weakening and Damping of Inelastic Structures
Publication: Journal of Structural Engineering
Volume 134, Issue 10
Abstract
Previous research has shown that weakening of inelastic structures can limit the maximum response accelerations they experience during ground motions, but may lead to an increase in the displacements (or interstory drifts). Added damping by using fluid viscous devices, on the other hand, reduces the interstory drifts and has no significant effect on total accelerations, when structures behave inelastically. The weakening and damping technique, thus, limits the total acceleration due to the weakening, and reduces the interstory drifts by adding damping, and hence addresses the two main causes for both structural and nonstructural damage in buildings. Optimal weakening and damping, which is the subject of this paper, involves the determination of the optimal locations and amount of weakening of the structural components as well as the optimal locations and magnitudes of added dampers. Weakening of the structure might create stability issues in the building that can be automatically considered, if active control theory is used for design. Based on a nonlinear active control procedure, control forces are calculated and implemented using equivalent passive dampers and weakening elements in order to achieve the closest effects. The methodology is applied to a case study of an eight-story nonlinear building tested using a set of ground motions corresponding to different hazard levels. Results show that the optimal design leads to a reduction of both peak interstory drifts and peak total accelerations.
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Acknowledgments
This research was conducted at Univ. at Buffalo and supported by Multi-disciplinary Center for Earthquake Engineering Research (MCEER), which in turn is supported by the Earthquake Engineering Research Centers Program of the National Science Foundation under the Award NSFEEC 970147. Any opinions, findings, conclusions, or recommendations expressed in this report are those of the writer(s) and do not necessarily reflect those of the Multidisciplinary Center for Earthquake Engineering Research (MCEER), the National Science Foundation (NSF), the State of New York (NYS), or the Univ. at Buffalo.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 10 • October 2008
Pages: 1638 - 1648
Copyright
© 2008 ASCE.
History
Received: Jun 5, 2007
Accepted: Mar 27, 2008
Published online: Oct 1, 2008
Published in print: Oct 2008
Notes
Note. Associate Editor: Anil Kumar Agrawal
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