Campus Units

Civil, Construction and Environmental Engineering, Electrical and Computer Engineering, Center for Nondestructive Evaluation (CNDE), Mechanical Engineering

Document Type

Article

Publication Version

Submitted Manuscript

Publication Date

10-1-2020

Journal or Book Title

Engineering Structures

Volume

220

First Page

110920

DOI

10.1016/j.engstruct.2020.110920

Abstract

This study assesses the performance of a novel passive variable friction damper (PVFD) at mitigating wind- and seismic-induced vibrations. The PVFD consists of two friction plates upon which a cam profile modulates the normal force as a function of its rotation. A unique feature of the PVFD is its customizable shape, yielding a customizable friction hysteresis. The objective of the study is to assess the benefits of crafting the friction behavior to satisfy motion criteria. This is done numerically on two example buildings: a 5-story structure subjected to seismic loads, and a 20-story structure subjected to non-simultaneous seismic and wind loads. A probabilistic performance-based design procedure is introduced to select the optimum cam configurations throughout each building under the design loads. After that, numerical simulations are conducted to compare their performance against that of two equivalent damping schemes: viscous dampers and passive friction dampers. Results show that customization of the hysteresis behaviors throughout a structure is necessary to yield optimal performance. Also, the PVFD outperforms the other damping schemes for wind mitigation by yielding a more stable response in terms of lower accelerations over the entire wind event. Under seismic loads, all three damping schemes exhibited comparable performance, but the PVFD yielded a significantly more uniform drift for the 20-story building.

Research Focus Area

Structural Engineering

Comments

This is a manuscript of an article published as Barzegar, Vahid, Simon Laflamme, Austin Downey, Meng Li, and Chao Hu. "Numerical evaluation of a novel passive variable friction damper for vibration mitigation." Engineering Structures 220 (2020): 110920. DOI: 10.1016/j.engstruct.2020.110920. Posted with permission.

Copyright Owner

Elsevier Ltd.

Language

en

File Format

application/pdf

Published Version

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