Postearthquake Strength Assessment of Steel Moment-Resisting Frame with Multiple Beam-Column Fractures Using Local Monitoring Data
Publication: Journal of Structural Engineering
Volume 144, Issue 2
Abstract
Quantitative reports on postearthquake infrastructure condition are valuable to engineers, building owners, local government entities, and the public. Despite their utility, sensor-based protocols have not been widely embraced, primarily due to a lack of proper demonstrations. This paper introduces a methodology for determining the postearthquake strength of a steel moment-resisting frame with multiple beam-column fractures based on local monitoring data. The damage index (), an existing metric based on dynamic strain measurements, is applied to quantify damage-induced reductions in bending stiffness at each beam end in the frame with decoupling damage interaction effects. An analytical model with updated local stiffness information enables the estimation of the building’s reduced strength. The proposed methodology may be automated to provide crucial structural information that can optimize and supplement visual inspections immediately after an earthquake so that emergency plans may be initiated promptly. The methodology is first validated using experimental observations and sensor data collected during a substructure test. Then its application to strength reduction estimation of multistory, multibay frames is examined with shake table tests on a large-scale three-story steel frame. Fractures at beam-column connections are perfectly tracked in all damage stages using . Estimated reductions in base shear and stiffness are among the results produced, which permit explicit comparisons to performance design limits. Appropriate FEMA connection damage index values are included in the discussions.
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Acknowledgments
Research funding is partially provided by the Japan Society for the Promotion of Science with Award PE15758. to the authors thank Shota Shimmoto and Yongtao Bai for their support with the experimentation.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 2 • February 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jul 7, 2016
Accepted: Aug 16, 2017
Published online: Dec 15, 2017
Published in print: Feb 1, 2018
Discussion open until: May 15, 2018
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