SMA Concrete Confinement: Material Behavior and Modeling

According to recent studies, concrete confinement with shape memory alloy (SMA) spirals is a potentially effective method for seismic retrofitting of reinforced concrete columns that are not flexural ductile. This method involves encircling concrete columns with prestrained SMA wires and heating the wires to activate the confining pressure. This chapter explains the SMA confined concrete’s experimental cyclic behavior and how a 3-D plasticity-based model for the material was created using the test findings. Based on experimental findings, a novel damage parameter, dilation rate function, and hardening/softening function are derived and verified. When compared to experimental findings, the suggested model can accurately replicate the axial and lateral stress-strain behaviors of NiTiNb-SMA confined concrete.