Structural health monitoring (SHM) is important to the infrastructure and transportation industries. SHM is often performed nondestructively, and a number of testing modalities including microwave nondestructive testing (NDT) have been successfully used to accomplish this goal. Within the realm of microwave NDT, sensors based on frequency selective surface (FSS) principles have found application for SHM, including detection of normal and shear strain, as well as delamination and disbond detection in layered structures. This work focuses on the design and implementation of an embedded FSS sensor for detection of strain and buckling during displacement load testing of a novel steel-tube reinforced concrete column.