Seismic Response and Damage of Reduced-Strength Steel MRF Structures with Nonlinear Viscous Dampers
Publication: Journal of Structural Engineering
Volume 144, Issue 12
Abstract
An experimental investigation of the seismic response and damage of steel moment resisting frame (MRF) building structures with nonlinear viscous dampers was conducted using ground motions up to and beyond the maximum considered earthquake (MCE) level. The objective was to assess the response of MRFs designed with reduced strength (relative to current practice) but with added damping to achieve enhanced seismic performance. The MRFs were designed for 100%, 75%, and 60%, respectively, of the base shear strength required by the current standard. The experiments used a real-time hybrid simulation (RTHS) approach in which an MRF, together with a frame with nonlinear viscous dampers and associated bracing (called the DBF), was in the laboratory, and the seismic mass and gravity system associated with the MRF and DBF and the inherent damping of the building were numerically modeled. Experimental results, including inelastic energy dissipation, development of damage, and local response of the reduced-strength MRFs (focusing on the MRF with 60% base shear strength) to ground motions from the frequently occurring earthquake (FOE) level up to 1.4 times the MCE level are presented. The results show that steel MRF structures designed with reduced strength and added nonlinear viscous dampers have excellent performance for ground motions beyond the MCE level.
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Acknowledgments
The research reported in this paper is based on work supported by the National Science Foundation, Award Nos. CMS-0936610 and CMS-0402490. Support was also provided through the Pennsylvania Infrastructure Technology Alliance from the Pennsylvania Department of Community and Economic Development. The hybrid simulations were conducted using the Network for Earthquake Engineering Simulation (NEES) Real-Time Multi-Directional (RTMD) earthquake simulation facility within the ATLSS (Advanced Technology for Large Structural Systems) Engineering Research Center at Lehigh University. The contributions of the NEES RTMD staff and ATLSS Center staff are gratefully acknowledged. The opinions, findings, and conclusions expressed in this paper are those of the authors and do not necessarily reflect the views of those acknowledged here.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 12 • December 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Aug 28, 2017
Accepted: Jun 20, 2018
Published online: Oct 8, 2018
Published in print: Dec 1, 2018
Discussion open until: Mar 8, 2019
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