Abstract
By introducing negative stiffness devices, this study further improves the maximum achievable damping ratio of conventional damped outrigger (CDO) structures with flexible perimeter columns. Dynamic characteristics of tall buildings with this novel negative stiffness damped outrigger (NSDO) are parametrically studied by solving the transcendental characteristic equations. An NSDO is able to improve the maximum achievable damping ratio to about 30% with less consumption of an outrigger damping coefficient (or a less amount of a viscous damper) as compared with a CDO. Numerical results showed that the NSDO is effective for both winds and earthquakes. For instance, an NSDO further decreases the maximum seismic interstory drift by 18.9% and reduces the total-wind-excited acceleration by 34.9%, with only a 20% outrigger damping consumption, as compared to a CDO. Because neither an NSDO nor CDO provides extra stiffness at low amplitudes of motion, an extra conventional outrigger (CO) is suggested to be placed at the top of a tall building when applying an NSDO in practical applications, and the effectiveness of an NSDO is also not compromised when an extra CO is placed.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request (wind and earthquake excitations used for simulation and all simulated results used to generate figures).
Acknowledgments
Financial support from the State Key Laboratory of Disaster Reduction in Civil Engineering of China (Grant No. SLDRCE19-B-16) is greatly acknowledged by Meng Wang and Fei-Fei Sun. Support from the Tongji Grant (SLDRCE13-MB-01) is acknowledged by Satish Nagarajaiah. Meng Wang would like to thank the China Scholarship Council for providing financial support.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jan 27, 2020
Accepted: Jun 25, 2020
Published online: Sep 23, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 23, 2021
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