Shape memory alloys are a class of alloys that display the unique ability to
undergo large plastic deformations and return to their original shape either
through the application of heat (shape memory effect) or by relieving the
stress causing the deformation (superelastic effect). This research takes
advantage of the unique characteristics of shape memory alloys in order to
provide a moment resisting connection with recentering capabilities.
In this study, superelastic Nitinol, a nickel-titanium form of shape memory
alloy that exhibits a flag-shaped stress versus strain curve, is used as the
moment transfer elements within a partially restrained steel beam-column
connection. Experimental testing consists of a one-half scale interior
connection where the loading is applied at the column tip. A pseudo-static
cyclic loading history is used which is intended to simulate earthquake
loadings. The energy dissipation characteristics, moment-rotation
characteristics, and deformation capacity of the connection are quantified.
Results are then compared to tests where A36 steel tendons are used as the
moment transfer elements. The superelastic Nitinol tendon connection showed
superior performance to the A36 steel tendon connection, including the ability
to recenter without residual deformation.
| Identifer | oai:union.ndltd.org:GATECH/oai:smartech.gatech.edu:1853/7185 |
| Date | 18 July 2005 |
| Creators | Penar, Bradley W. |
| Publisher | Georgia Institute of Technology |
| Source Sets | Georgia Tech Electronic Thesis and Dissertation Archive |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
| Format | 84249267 bytes, application/pdf |
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