PSI - Issue 5

J. Morais et al. / Procedia Structural Integrity 5 (2017) 705–712

712

Morais J et al./ Structural Integrity Procedia 00 (2017) 000 – 000

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Fig. 9. Thermographic image from one of the tensile tests.

5. Conclusions

On this paper, we presented a new iteration of a SMA wire based damper for earthquake response mitigation. This concept was thoroughly explained and the manufactured prototype was submitted to a preliminary validation process. This device exhibited four useful features, suitable for this type of application:  Energy dissipation features , due to the SMA Superelastic effect and the double counteracting wire arrangement;  Predictable external load and multiple stiffness stages, allowing a proper configuration of the device for any particular application;  Control of the transmitted force and wide amplitude range , making it a suitable solution for a wide range of different earthquake categories;  Re-centering capability , to bring back the structural system to its initial configuration when the earthquake action is over. This device is our iteration on the concept, which performed well, both in terms of its mechanical behavior as well as in its role as an energy dissipating device. Future work on this subject will include submitting the device to earthquake simulation tests, devise a solution to dissipate the heat generated during the loading cycle and eventually build the full scale version of the SMA damper. Dolce, M., Cardone, D., 2001. Mechanical behaviour of shape memory alloys for seismic applications, International Journal of Mechanical Sciences. Dolce, M., Cardone, D., Marnetto, R., 2000. Implementation and testing of passive control devices based on shape memory alloys, EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS. Motahari, S., Ghassemieh, M., Abolmaali, S., 2007. Implementation of shape memory alloy dampers for passive control of structures subjected to seismic excitations, Journal of Constructional Steel Research. Zhang, Y., Zhu, S., 2006. A shape memory alloy-based reusable hysteretic damper for seismic hazard mitigation, SMART MATERIALS AND STRUCTURES. References