A passive rotary system for seismic risk mitigation of steel structures

Chan, R and Wong, P 2014, 'A passive rotary system for seismic risk mitigation of steel structures', Australasian Journal of Construction Economics and Building - Conference series, vol. 2, no. 2, pp. 72-79.


Document type: Journal Article
Collection: Journal Articles

Title A passive rotary system for seismic risk mitigation of steel structures
Author(s) Chan, R
Wong, P
Year 2014
Journal name Australasian Journal of Construction Economics and Building - Conference series
Volume number 2
Issue number 2
Start page 72
End page 79
Total pages 8
Publisher University of Technology, Sydney * Library
Abstract This paper presents a novel bracing system designed for earthquake risk mitigation for steel structures. It involves a rotary system which a Chebyshev linkage connected to the ground and the building frame. Upon earthquake excitation, movement of structure floor slabs causes a rotational motion in the disc. Displacement-based dampers are installed between the rotary system and the ground which damp the structural vibrations. The system amplifies the travel of the dampers and efficiency is enhanced. In addition, the cross-brace members are always in tension, permitting the use of very slender sections. The paper first reviews the governing equations of the system, followed by a physical model demonstration. A 3-degree-of-system model with the proposed rotary system was subjected to simulated ground shaking. Acceleration on top floor was measured. Results demonstrated that proposed system effectively supresses the vibrational characteristics of the structure, and represents a viable and inexpensive solution to mitigate seismic risks.
Subject Structural Engineering
Earthquake Engineering
Keyword(s) Earthquake engineering
passive energy dissipation
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ISSN 2200-7679
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