Seismic Retrofit of Soft-First-Story Structures Using Rotational Friction Dampers
Publication: Journal of Structural Engineering
Volume 145, Issue 12
Abstract
In this research a seismic retrofit system consisting of a pin-jointed steel frame and rotational friction dampers is developed for the seismic retrofit of reinforced concrete soft-first-story structures, and its efficiency is evaluated through theoretical formulation, cyclic loading test, and analysis of a case study structure. In this system, pin-jointed steel frames are attached to a framed structure at the first story, and a rotational friction damper is installed at each corner of the steel frames. A theoretical formulation is derived for the amplification mechanism of the rotational friction damper and is used to design the geometry of the damper in such a way that its rotation is maximized for a given lateral drift of the structure. The experimental and analysis results show that the proposed system can be used efficiently to prevent the collapse of the case study structure and reduce interstory drift ratios to the code-stipulated limit states.
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Acknowledgments
This research was supported by Land Transport Technology Promotion Research Project (19CTAP-C153076-01) of the Ministry of Land, Infrastructure and Transport of Korea.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 12 • December 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Dec 25, 2018
Accepted: Mar 26, 2019
Published online: Oct 9, 2019
Published in print: Dec 1, 2019
Discussion open until: Mar 9, 2020
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