Study on Damping Performance of Hyperboloid Damper with SMA-Negative Stiffness

To improve the limiting capacity of isolation bearings and reduce residual deformation, a new material shape memory alloy (SMA) was introduced into the damping device. SMA shape memory materials have shape memory effect, superelastic effect, and damping properties of metal alloys. Although the SMA isolation bearing can improve the self-resetting ability of the bridge, it will increase the internal force response of the substructure compared with the ordinary isolation bearing. To solve this problem, a new type of SMA negative stiffness hyperboloid shock absorber is proposed. The device is provided with restoring force by SMA cables, negative rigidity by two friction pendulum supports with opposite curved surfaces, and energy dissipation capacity by friction between the slider and the upper and lower steel plates. Theoretical derivation and finite element analysis results show that the damping device can not only provide the self-resetting ability of the bridge but also partially reduce the internal force response of the SMA damping bridge structural system on the premise of reducing the displacement response of the bridge.

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