ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Superelastic shape memory alloys (SMAs) can experience large strains up to 8~10% andrestore residual strains just by removing the stress. By employing this unique characteristic of SMAs,a new beam-to-column connection is presented in this paper. The proposed SMA connection consistsof an extended end-plate, eight long shank Nitinol SMA bolts, beam flange ribs, beam web stiffenersand continuity steel plates for reinforcing column flanges. In order to predict the behavior of SMAconnection, 3-D solid finite element models are set up in ANSYS. The numerical results indicate thatthe local buckling of beam is avoided and a plastic hinge forms at beam-to-column interface when themoment-carrying capacity of bolt cluster is below the elastic flexural capacity of connecting beam.The SMA connection shows stable moment-rotation hysteresis curves with re-centering capability,which demonstrates the connection’s self-healing deformations function. Far different from energydissipated by steel yield in traditional connection, the SMA connection shows moderate energydissipation capacity, and this amount of energy is mainly dissipated by the superelastic behavior ofSMA bolts. Moreover, the connection model shows a large inelastic rotation capacity beyond 0.03 rad.The ductility of SMA connection is deeply influenced by the length of SMA bolts, and the 2.2 timeslength of normal bolt is suggested for SMA bolts
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.3039.pdf
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