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http://hdl.handle.net/10397/5861
Title: | Loading rate effect on superelastic SMA-based seismic response modification devices | Authors: | Zhu, S Zhang, Y |
Issue Date: | Jun-2013 | Source: | Earthquake and structures, June 2013, v. 4, no. 6, p. 607-627 | Abstract: | The application of shape memory alloys (SMAs) to the seismic response reduction of civil engineering structures has attracted growing interest due to their self-centering feature and excellent fatigue performance. The loading rate dependence of SMAs raises a concern in the seismic analysis of SMA-based devices. However, the implementation of micromechanics-based strain-rate-dependent constitutive models in structural analysis software is rather complicated and computationally demanding. This paper investigates the feasibility of replacing complex rate-dependent models with rate-independent constitutive models for superelastic SMA elements in seismic time-history analysis. Three uniaxial constitutive models for superelastic SMAs, including one rate-dependent thermomechanical model and two rate-independent phenomenological models, are considered in this comparative study. The pros and cons of the three nonlinear constitutive models are also discussed. A parametric study of single-degree-of-freedom systems with different initial periods and strength reduction factors is conducted to examine the effect of the three constitutive models on seismic simulations. Additionally, nonlinear time-history analyses of a three-story prototype steel frame building with special SMA-based damping braces are performed. Two suites of seismic records that correspond to frequent and design basis earthquakes are used as base excitations in the seismic analyses of steel-braced frames. The results of this study show that the rate-independent constitutive models, with their parameters properly tuned to dynamic test data, are able to predict the seismic responses of structures with SMA-based seismic response modification devices. | Keywords: | Shape memory alloy Superelasticity Loading rate effect Damper Constitutive model |
Publisher: | Techno Press | Journal: | Earthquakes and structures | ISSN: | 2092-7614 | EISSN: | 2092-7622 | DOI: | 10.12989/eas.2013.4.6.607 | Rights: | © 2013 Techno Press |
Appears in Collections: | Journal/Magazine Article |
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File | Description | Size | Format | |
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EnS Loading rate effect of SMA model.pdf | Pre-published version | 624.09 kB | Adobe PDF | View/Open |
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