Seismic Demand on Acceleration-Sensitive Nonstructural Components in Viscously Damped Braced Frames
Publication: Journal of Structural Engineering
Volume 146, Issue 9
Abstract
This paper investigates the seismic demand on acceleration-sensitive nonstructural components in buildings equipped with fluid viscous dampers. Nonlinear dynamic response analyses were conducted on three steel moment-resisting archetype frames of different heights, and incorporating linear and nonlinear viscously damped braces. The FEMA P695 far-field ground motion records set scaled to various intensities were used as seismic input. The main variables investigated in the parametric study included three different target supplemental damping levels, two different distributions of damper properties along the frames’ height, and six different nonlinear damper velocity exponents. The numerical results indicate that the inclusion of fluid viscous dampers generally improves the seismic response of the archetype frames. However, the seismic demand on acceleration-sensitive nonstructural components varies significantly depending on the properties of the dampers. For some combinations of dampers’ properties, the peak floor horizontal accelerations and floor spectral absolute accelerations in certain nonstructural period ranges can exceed that of the control frames without fluid viscous dampers. These results highlight the limitations of the peak floor acceleration as an engineering demand parameter for acceleration-sensitive nonstructural components.
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Data Availability Statement
All models generated during the study are available from the corresponding author by request. (OpenSees input/.tcl files of all numerical models analyzed).
Acknowledgments
The work presented in this paper has been developed within the framework of the project Dipartimenti di Eccellenza, funded by the Italian Ministry of University and Research at the University School for Advanced Studied IUSS Pavia. The Erasmus Mundus Program and the EUCENTRE Foundation are gratefully acknowledged for having provided financial support to the first author of this paper. The authors gratefully acknowledge also the Italian Department of Civil Protection (DPC) for their financial contributions to this study through the ReLUIS 2019-2021 Project (Work Package 17—Contributi Normativi Per Elementi Non Strutturali).
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 146 • Issue 9 • September 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jun 22, 2019
Accepted: Apr 1, 2020
Published online: Jun 30, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 30, 2020
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