Shape memory alloy-spring damper for seismic control and its application to bridge with laminated rubber bearings. Issue 15 (November 2021)

• Record Type: Journal Article
• Authors: Cao, Sasa; Yi, Jiang
• Is Part Of: Advances in structural engineering. Volume 24:Issue 15(2021)
• Page Start: 3550
• Page End: 3563
• Publication Date: 2021-11
• Subjects: passive damper -- shape memory alloy -- laminated rubber bearing -- seismic control -- residual displacement; Structural engineering -- Periodicals; Construction, Technique de la; Structural engineering; Periodicals; 624.1
• DOI: 10.1177/13694332211033955
• Languages: English
• ISSNs: 1369-4332

Abstract

This study introduces a shape memory alloy (SMA)-spring damper which is composed of SMA bars and elastic springs arranged in perpendicular. The damper depicts a curved flag-shape hysteretic behavior that is endowed with self-centering capacities and large deformation capabilities but uses reduced amount of SMA material. A design procedure is proposed to apply the SMA-spring damper to the bridge with laminated rubber bearings which would slide under seismic excitations. Analytical results validate the effectiveness of SMA-spring dampers in seismic control of the bridge: (1) The damper provides trivial stiffness to the bridge at small displacement, and the isolation efficiency of the bridge is maintained; (2) large horizontal force is provided for the structures at large deformation of the bearings, which alleviates the excessive displacement of bearings and prevents span collapse; and (3) the damper helps recenter the bearings and reduce the residual displacement of the bridge.