Design Concepts for Controlled Rocking of Self-Centering Steel-Braced Frames
Publication: Journal of Structural Engineering
Volume 140, Issue 11
Abstract
The self-centering rocking steel-braced frame is a high-performance system that can prevent major structural damage and minimize residual drifts during large earthquakes. It consists of braced steel frames that are designed to remain elastic and allowed to rock off their foundation. Overturning resistance is provided by elastic post-tensioning, which provides a reliable self-centering restoring force, and replaceable structural fuses that dissipate energy. The design concepts of this system are examined and contrasted with other conventional and self-centering seismic force resisting systems. Equations to predict the load-deformation behavior of the rocking system are developed. Key limit states are investigated including desired sequence of limit states and methods to help ensure reliable performance. Generalized design methods for controlling the limit states are developed. The design concepts are then applied to a six-story prototype structure to illustrate application of the rocking steel frame system and provide the framework for a coordinated research program to further develop and validate the concepts.
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Acknowledgments
The authors greatly appreciate the contributions to this work from graduate students Kerry Hall, Eric Borchers, and Alex Peña, postdoctoral researcher Paul Cordova, and practicing structural engineer Gregory Luth. The authors also thank our Japanese collaborators, professors Toru Takeuchi, Mitsumasa Midorikawa, Masayoshi Nakashima, Kazuhiko Kasai, researcher at E-Defense Tsuyoshi Hikino, and graduate students Ryota Matsui, Masaru Oobayashi, Yosuke Yamamoto, and Ryohei Yamazaki. This material is based upon work supported by the National Science Foundation under Grant No. (CMMI-0530756) via the George E. Brown, Jr. Network for Earthquake Engineering Simulation, the American Institute of Steel Construction, Stanford University, and the University of Illinois at Urbana-Champaign.
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Information
Published In
Journal of Structural Engineering
Volume 140 • Issue 11 • November 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: May 22, 2013
Accepted: Feb 6, 2014
Published online: May 21, 2014
Discussion open until: Oct 21, 2014
Published in print: Nov 1, 2014
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