Seismic Response Evaluation of Posttensioned Precast Concrete Frames with Friction Dampers
Publication: Journal of Structural Engineering
Volume 134, Issue 1
Abstract
This paper presents a seismic response evaluation of unbonded posttensioned precast concrete moment frames that use friction dampers at selected beam ends. The dampers utilize the displacements that occur as a result of gap opening between the beam and column members during an earthquake. The parameters investigated include the number of stories, number and strength of the dampers, and amount of posttensioning. Nonlinear static and dynamic time history analyses of prototype structures show that the dampers provide a considerable amount of energy dissipation to a frame, while the posttensioning force provides a restoring effect resulting in self-centering capability (i.e., ability of the structure to return towards its undisplaced position upon unloading). The seismic design of the structures to achieve target displacement-based performance objectives is critically evaluated based on the analysis results. Comparisons with structures that use mild steel (e.g., Grade 60) reinforcement through the beam-column joints as well as structures that use only posttensioning steel (with no friction dampers) and structures that use combinations of mild steel and posttensioning steel are also provided.
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Acknowledgments
This research was funded by the National Science Foundation (NSF) under Grant No. NSFCMS 98-74872 as a part of the CAREER Program. The support of the NSF Program Director, Dr. S. Liu, is gratefully acknowledged. In addition, the writers recognize the technical and financial support provided by industry partnerships with: R. W. Monroe and D. R. Poweleit of the Steel Founders’ Society of America; R. Reddy of Southwest Steel Casting Company of Longview, Texas; C. E. Hilgeman and M. A. Fusani of Concrete Technology, Inc. of Springboro, Ohio; and K. B. Allen and D. Martin of Dywidag-Systems International of Bolingbrook, Illinois. The opinions, findings, and conclusions expressed in the paper are those of the writers and do not necessarily reflect the views of the NSF or the individuals/organizations acknowledged above.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 1 • January 2008
Pages: 132 - 145
Copyright
© 2008 ASCE.
History
Received: May 1, 2006
Accepted: Jul 5, 2007
Published online: Jan 1, 2008
Published in print: Jan 2008
Notes
Note. Associate Editor: Marvin W. Halling
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