Simplified Derivation of a Damage Curve for Seismically Induced Beam Fractures in Steel Moment-Resisting Frames
Publication: Journal of Structural Engineering
Volume 142, Issue 6
Abstract
This paper presents a simplified method of deriving a novel damage curve to quantify the damage extent of seismically induced beam fractures in steel moment-resisting frames. The damage curve expresses a damage index as a function of reduction in bending stiffness at the fractured section, where the damage index is obtained by comparing strain responses measured on steel beams under ambient vibrations before and after earthquakes. A closed-form expression of the damage curve was formulated from a two-story two-bay frame model based on a parametric analysis conducted to examine relationships between the damage curve and various structural parameters. The notable finding from the parametric analysis was that the damage curve was primarily affected by the span-depth ratio of the monitored beam. Thus, the closed-form expression was demonstrated to be applicable to the construction of damage curves for common multi-story multi-bay steel moment-resisting frames. The effectiveness of the closed-form expression was verified numerically using a nine-story steel moment-resisting frame model and experimentally using a one-quarter-scale five-story steel frame testbed.
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Acknowledgments
This work was supported by JSPS KAKENHI Grant Number 26820230 and by the General Collaborative Research program of the Disaster Prevention Research Institute, Kyoto University. The authors would like to express their sincere gratitude to Dr. Yongtao Bai, Ms. Kaede Minegishi, and Ms. Akiko Suzuki for their assistance in the vibration tests.
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 142 • Issue 6 • June 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 18, 2015
Accepted: Nov 17, 2015
Published online: Jan 25, 2016
Published in print: Jun 1, 2016
Discussion open until: Jun 25, 2016
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