Seismic Control of Cable-Stayed Bridges Using Shape Memory Alloy Dampers

Abstract eng:
The superelasticity and damping capability of the shape memory alloys (SMAs) are sought in this study to develop a supplementary recentering and energy dissipation device for cable-stayed bridges. This paper introduces and investigates the performance of a new passive seismic control device for cable-stayed bridges made with SMAs. A three-dimensional long-span bridge model including the effect of soil-structure interaction is developed and utilized in the study. SMA dampers are implemented at the bridge’s deck-pier and deck-tower connections. The bridge is subjected to three orthogonal components from a historic ground motion record. The effectiveness of the SMA dampers in controlling the deck displacement and limiting the shear and bending moment demands on the bridge towers is assessed. The analytical results show that SMA dampers can successfully control the seismic behavior of the bridge. However, the effectiveness of the new dampers is significantly influenced by the relative stiffness between the dampers used at the deck-tower and deck-pier connections.

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