Shake Table Testing of Shear-Controlling Rocking Isolation Podium System for Mitigating Higher-Mode Effects in Tall Buildings
Publication: Journal of Structural Engineering
Volume 149, Issue 5
Abstract
This paper presents shake table testing results of a scaled tower specimen equipped with a novel self-centering shear and moment dual-base mechanism system, termed the shear-controlling rocking isolation podium (SCRIP) system, for mitigating higher-mode effects in tall buildings. The scaled shake table specimen of the SCRIP system consists of a shear mechanism that controls base shear demands through the lateral response of a base podium supported by rocking columns below and friction braces in the periphery, in addition to a free-rocking mechanism above the base podium to limit the base overturning moment demands of the tower. Both mechanisms are designed to exhibit full self-centering capabilities. There were 220 shake table tests performed using two suites of ground motion (GM) excitations with increasing amplitudes from 50% to 150% in increments of 25%. The scaled SCRIP system was shown to reliably control both the peak base shear and overturning moment demands close to the design values even as the excitation amplitudes were increased. Seismic demands along the height of the tower above the SCRIP system were also well controlled. Negligible changes in the lateral resistance of the scaled SCRIP system were observed throughout the shaking table test program with no apparent damage or measured residual deformations. The bidirectional capability of the scaled SCRIP system was also experimentally demonstrated through GM excitations applied diagonally with respect to the system’s two principal horizontal directions. In addition, these results experimentally verified the concept of limiting both shear and overturning moment at the base of a slender structure to control the seismic demands and associated higher-mode effects along the height of the structure.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The financial support of the Natural Sciences and Engineering Research Council (NSERC) is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 149 • Issue 5 • May 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 22, 2022
Accepted: Jan 6, 2023
Published online: Feb 21, 2023
Published in print: May 1, 2023
Discussion open until: Jul 21, 2023
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Cited by
- Chiyun Zhong, Constantin Christopoulos, Simplified Method for the Preliminary Design of Shear-Controlling Rocking-Isolation Podium Systems for Tall Buildings, Journal of Structural Engineering, 10.1061/JSENDH.STENG-12155, 149, 11, (2023).