Mechanical Performance of Prefabricated Monolithic Composite Columns with Reinforced ECC Precast Shell

To enhance the mechanical properties of a precast monolithic column, the ECC material was made into a prefabricated shell with reinforced bars. Post-cast concrete was poured into the precast parts to form the reinforced ECC precast monolithic composite columns. An axial compression test was conducted to investigate the failure pattern, load-bearing capacity, and deformation performance. The results showed that the R/ECC composite columns had good integrity. The R/ECC prefabricated shell exerted an extra confinement effect on the column and enhanced deformability. At the yield stage, the displacement of the reinforced ECC prefabricated columns was 16.19% greater than that of RC composite columns on average. Additionally, the maximum load point displacement exhibited 15.30% growth. The ECC material delayed the yield time of longitudinal bars and stirrups. Before reaching the maximum load, the strains in the R/ECC composite column rebars were smaller than those in the RC column rebars. At the maximum loading point, the longitudinal reinforcement exhibited a 9.36% greater strain than that of the RC composite column.