Table of Contents
Journal of Structures
Volume 2014 (2014), Article ID 262409, 17 pages
http://dx.doi.org/10.1155/2014/262409
Research Article

Hybrid Recentering Energy Dissipative Device for Seismic Protection

Department of Civil and Environmental Engineering, Syracuse University, Syracuse, NY 13244-1240, USA

Received 20 May 2014; Revised 30 July 2014; Accepted 1 August 2014; Published 23 September 2014

Academic Editor: Chris G. Karayannis

Copyright © 2014 Wenke Tang and Eric M. Lui. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A hybrid recentering energy dissipative device that has both recentering and energy dissipation capabilities is proposed and studied in this paper. The proposed hybrid device, referred to as the hybrid shape memory alloy (SMA) recentering viscous fluid (RCVF) energy dissipation device, connects the apex of a chevron brace to an adjoining beam using two sets of SMA wires arranged in series on either side of the brace and a viscous fluid damper arranged in parallel with the SMA wires. The viscous damper is used because being a velocity-dependent device it does not exert any force that counteracts the recentering force from the SMA wires after the vibration of the frame ceases. In the numerical study, the Wilde’s SMA constitutive model is used to model the SMA wires, and the Maxwell model is used to simulate the viscous fluid damper. To demonstrate the viability and effectiveness of the proposed hybrid device, comparative studies are performed on several single-story shear frames and a series of four-story steel frames. The results show that the frames equipped with the hybrid device have noticeably smaller peak top story displacements and residual story drifts when subjected to ground motions at three different intensity levels.