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Advances in Civil Engineering
Volume 2018, Article ID 2037376, 13 pages
https://doi.org/10.1155/2018/2037376
Research Article

Tests on Pretrained Superelastic NiTi Shape Memory Alloy Rods: Towards Application in Self-Centering Link Beams

1Department of Civil Engineering, Zhejiang University, 866 Yuhangtang Road, Hangzhou, Zhejiang 310058, China
2Institute of Urban Construction, Hangzhou Polytechnic, 198 Gaoke Road, Hangzhou, Zhejiang 311402, China

Correspondence should be addressed to Xian Xu; nc.ude.ujz@ux_naix

Received 12 October 2017; Accepted 22 February 2018; Published 1 April 2018

Academic Editor: Stefano Sorace

Copyright © 2018 Xian Xu et al. 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

Austenitic shape memory alloy has potential applications in self-centering seismic resistant structural systems due to its superelastic response under cyclic tension. Raw austenitic SMA needs proper pretreatments and pretraining to gain a stable superelastic property. In this paper, tests are carried out to investigate the effects of pretraining, pretreatments, loading rate, and strain amplitude on the mechanical performance on austenitic SMA rods with a given size. The tested rods are to be used in a new concept self-centering steel link beam. Customized pretraining scheme and heat treatment are determined through the tests. The effects of loading rate and strain amplitude are investigated. A simplified stress-strain model for the SMA rods oriented to numerical simulations is obtained based on the test results. An example of using the simplified material model in numerical analysis of a self-centering steel link beam is conducted to validate the applicability of the model.