Finite element analysis of actively confined concrete using shape memory alloys

Abstract

The novel technique of using Shape Memory Alloy (SMA) transverse reinforcement to confine concrete has proven its success in increasing the strength and ductility of concrete elements significantly. This new technique exploits the thermally activated shape memory feature of SMAs to apply high and permanent confinement pressure on concrete. Despite the experimental work done in this topic over the last few years, the numerical/analytical efforts are still lacking. This paper utilizes the analytical framework of the damaged plasticity model along with the finite element method (FEM) to predict and study the behavior of SMA confined concrete under uniaxial compression load. The flow rule and hardening/ softening function adopted in the models are developed based on previous test results. The results prove that the finite element models can successfully capture the behavior of SMA confined concrete.