SHAPE MEMORY ALLOY IN CIVIL ENGINEERING APPLICATIONS
Volume Title: ICASGE2025
Paper ID : 1081-ICASGE-FULL
Authors
University of Calgary-Department of Civil Engineering
Abstract
Shape Memory Alloy (SMA) has attracted researchers from different fields due to their superior properties. SMA is categorized as an emerging smart material with a unique class of alloy for its ability to undergo considerable deformation as well as energy dissipation capacities while maintaining a super-elastic response and returning to its original shape after being deformed beyond the elastic limits through stress removal (Super Elasticity) used for new construction or through heating (Shape Memory Effect) used for active strengthening applications.
The most common type of SMA is made of Nickel and Titanium (NiTi). The unique characteristic properties of NiTi were found to have potential opportunities for implementation in various civil engineering applications. A newly developed iron-based SMA (Fe-SMA) with considerably lower cost, high recovery stress, and a very large thermal hysteresis is considered the best SMA candidate for structural engineering applications in the near future. Depending on the nature of the application, the SMA can be formed into various shapes, such as wires, bars, rings, sheets, strips and plates.
The superior properties of SMA make it a good reinforcement candidate for use in the seismic design of structures at the location of plastic hinges. Pre-strained SMA bars and plates have been used as externally prestressed reinforcement in flexural strengthening of RC beams/slabs/columns. Another strengthening application is confining RC columns using SMA plates or wires.
Findings from many researchers added valuable knowledge to reinforcing and strengthening RC structures and widened the potential applications of the SMA in the structural engineering field.
The most common type of SMA is made of Nickel and Titanium (NiTi). The unique characteristic properties of NiTi were found to have potential opportunities for implementation in various civil engineering applications. A newly developed iron-based SMA (Fe-SMA) with considerably lower cost, high recovery stress, and a very large thermal hysteresis is considered the best SMA candidate for structural engineering applications in the near future. Depending on the nature of the application, the SMA can be formed into various shapes, such as wires, bars, rings, sheets, strips and plates.
The superior properties of SMA make it a good reinforcement candidate for use in the seismic design of structures at the location of plastic hinges. Pre-strained SMA bars and plates have been used as externally prestressed reinforcement in flexural strengthening of RC beams/slabs/columns. Another strengthening application is confining RC columns using SMA plates or wires.
Findings from many researchers added valuable knowledge to reinforcing and strengthening RC structures and widened the potential applications of the SMA in the structural engineering field.
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