D. Cardone, G. Gesualdi, G. Perrone, Univeristy of Basilicata, Potenza, Italy
Two devices exploiting the superelastic properties of SMA for the seismic retrofit of bridges and other structures are presented.
The aim of the first application, based on SMA wires, is to control the seismic displacements of bridge decks, preventing deck unseating and pounding between adjacent decks or between deck and abutments, thus avoiding damages to bearings and joints.
The aim of the second application, based on SMA bars, is to enhance the seismic behaviour and limit force changes due to air temperature variations of steel tie-rods for the seismic retrofit of masonry buildings, arches and vault structures.
Extensive simulation analyses have been conducted to assess the effectiveness of SMA to improve the seismic response of bridges, arches and vault structures. The results of numerical analyses show that SMA not only can effectively control the seismic displacements of bridges and other structures but they can also improve their performances under service conditions.
Summary: Two device concepts based on the superelastic properties of SMA for the seismic retrofit of bridges and other structures are described.
The thermomechanical behaviour of the devices is described by means of two phenomenological models calibrated based on the results of experimental tests on NiTi superelastic SMA wires.
Extensive numerical simulation analyses have been conducted to assess the effectiveness of SMA to improve the seismic response of bridges and other structures.
