Friction Damped Posttensioned Self-Centering Steel Moment-Resisting Frames
Publication: Journal of Structural Engineering
Volume 134, Issue 11
Abstract
A new connection for steel moment-resisting frames that incorporates posttensioning elements to provide a self-centering capacity along with friction mechanisms to dissipate energy is proposed and experimentally validated. The restoring force from the posttensioning elements in the connection makes the structure return to its undeformed state, even after experiencing large inelastic drifts. A bolt-prestressed friction mechanism with a frictional interface consisting of stainless steel and new nonasbestos organic break lining pads dissipates seismic input energy as the system undergoes lateral deformations. Cyclic tests were conducted to investigate the efficiency of the proposed friction interface and its performance under loading conditions that are expected during seismic loading. The test results showed that the frictional behavior is stable, repeatable, and predictable, although its friction coefficient is relatively low. Exterior and interior self-centering moment connections equipped with the proposed friction dampers were tested to study their structural behavior under cyclic loading. The results confirmed that friction damped posttensioned self-centering connections are capable of developing similar stiffness and strength characteristics to welded connections. They are also capable of undergoing large deformations with good energy dissipation characteristics, but without introducing inelastic deformations in the beams or the columns and without residual story drifts. Even at the ultimate stage, i.e., beyond the self-centering limit, the proposed connections can be detailed to exhibit a ductile response with the formation of flexural hinges in the beam sections, thus avoiding the sudden loss of strength and stiffness that occurs when the posttensioning elements are overloaded or when the beams buckle under excessive combined axial loads and bending moments.
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Acknowledgments
Financial support for this study was provided by the National Science and Engineering Research Council (NSERC) of Canada. The in-kind contributions from Carlisle Group, Inc., are gratefully acknowledged. The writers wish to underline the most valuable contributions of the technical staff of the Structures Laboratories at the University of Toronto throughout the entire experimental program.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 11 • November 2008
Pages: 1768 - 1779
Copyright
© 2008 ASCE.
History
Received: Mar 15, 2007
Accepted: Mar 21, 2008
Published online: Nov 1, 2008
Published in print: Nov 2008
Notes
Note. Associate Editor: James S. Davidson
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