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http://dx.doi.org/10.12989/sss.2011.7.1.041

Fatigue laboratory tests toward the design of SMA portico-braces  

Carreras, G. (Department of Applied Physics, ETSECCPB, UPC)
Casciati, F. (Department of Structural Mechanics, University of Pavia)
Casciati, S. (Department ASTRA, University of Catania)
Isalgue, A. (Department of Applied Physics, ETSECCPB, UPC)
Marzi, A. (Department of Structural Mechanics, University of Pavia)
Torra, V. (Department of Applied Physics, ETSECCPB, UPC)
Publication Information
Smart Structures and Systems / v.7, no.1, 2011 , pp. 41-57 More about this Journal
Abstract
A deeper understanding of the effectiveness of adopting devices mounting shape memory alloy (SMA) elements in applications targeted to the mitigation of vibrations is pursued via an experimental approach. During a seismic event, less than 1000 loading-unloading cycles of the alloy are required to mitigate the earthquake effects. However, the aging effects during the time of inactivity prior to the oscillations (several decades characterized by the yearly summer-winter temperature wave) should be considered in order to avoid and/or minimize them. In this paper, the results obtained by carrying out, in different laboratories, fatigue tests on SMA specimens are compared and discussed. Furthermore, the effects of seismic events on a steel structure, with and without SMA dampers, are numerically simulated using ANSYS. Under an earthquake excitation, the SMA devices halve the oscillation amplitudes and show re-centering properties. To confirm this result, an experimental campaign is conducted by actually installing the proposed devices on a physical model of the structure and by evaluating their performance under different excitations induced by an actuator.
Keywords
damping; fatigue life; passive control systems; shape memory alloys; vibration mitigation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By Web Of Science : 4  (Related Records In Web of Science)
Times Cited By SCOPUS : 4
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