Hysteretic behavior and ultimate energy dissipation capacity of large diameter bars made of shape memory alloys under seismic loadings González-Sanz, Guillermo Galé-Lamuela, David Escolano-Margarit, David Benavent Climent, Amadeo Este articulo se desarrolló en el marco del proyecto europeo "SERA, Seismology and Earthquake Engineering Research Infrastructure Alliance for Europe", INFRAIA-01-2016-2017 Research Infrastructure for Earthquake Hazard. Shape memory alloys in the form of bars are increasingly used to control structures under seismic loadings. This study investigates the hysteretic behavior and the ultimate energy dissipation capacity of large-diameter NiTi bars subjected to low- and high-cycle fatigue. Several specimens are subjected to quasi-static and to dynamic cyclic loading at different frequencies. The influence of the rate of loading on the shape of the hysteresis loops is analysed in terms of the amount of dissipated energy, equivalent viscous damping, variations of the loading/unloading stresses, and residual deformations. It is found that the log-log scale shows a linear relationship between the number of cycles to failure and the normalized amount of energy dissipated in one cycle, both for low- and for high-cycle fatigue. Based on the experimental results, a numerical model is proposed that consists of two springs with different restoring force characteristics (flag-shape and elastic-perfectly plastic) connected in series. The model can be used to characterize the hysteretic behavior of NiTi bars used as energy dissipation devices in advanced earthquake resistant structures. The model is validated with shake table tests conducted on a reinforced concrete structure equipped with 12.7 mm diameter NiTi bars as energy dissipation devices. 2024-02-08T09:35:01Z 2024-02-08T09:35:01Z 2019-10-13 journal article GONZÁLEZ-SANZ, Guillermo, et al. Hysteretic behavior and ultimate energy dissipation capacity of large diameter bars made of shape memory alloys under seismic loadings. Metals, 2019, vol. 9, no 10, p. 1099. https://hdl.handle.net/10481/88690 10.3390/met9101099 eng eu-repo/grantAgreement/EC/H2020/730900 http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional MDPI