SMA Seismic Damping Devices Fabrication, Testing, Analysis and Projections

Seismic dampers using SMAs have only been installed in large structures such as skyscrapers and bridges in a very few cases, even though numerous studies have confirmed the efficacy of these alloys. What is needed for much greater use of SMAs is large, versatile, easily fabricated forms that are tested and approved by civil engineering agencies.

            In this study, we made several forms of potential SMA damping elements, tested their cyclic energy absorption properties and stability, and confirmed scale up capability for large structure applications using extensive FEA treatments. Preferred shapes, with their positive features such as high load capability, adjustable deformation ranges, self deformation limiting, high cyclic stability and self re-centering are discussed. Also, a number of untested forms and permutations of shapes and alloys that cover a wide range of damping needs are addressed. In combination, these will aid in creating a product list of potential SMA damping devices that can be built, tested and approved for the large structures market.