Compressive Performance of RC Columns Strengthened with High-Strength Stainless Steel Wire Mesh-ECC under Small Eccentric Compression Load

Based on the test data, the comparison curves of steel wire mesh-ECC-reinforced columns with different eccentricities are shown in Figure 16 . The eccentricity ratio has little effect on the elastic stiffness of the column at the initial stage of loading. With the increase of load, the specimen gradually enters the elastic-plastic stage, and the stiffness of the specimen with small eccentricity ratio is significantly greater than that of the specimen with large eccentricity ratio. The eccentricity ratio has an important influence on the deformation of the specimen. Under the same load, with the increase of eccentricity ratio, the mid-span lateral deflection of columns increase, and the load dropping stage especially tends to be flatter, indicating that the larger the eccentricity ratio is, the better the ductility of the reinforced specimen is. In addition, it can be seen from Figure 16 b that the eccentricity ratio also has an important influence on the bearing capacity. The larger the eccentricity ratio is, the smaller the cracking load and peaking load of the specimen are. It can be seen from Figure 16 c that the development trend of the load-ECC compressive strain curve of the steel wire mesh-ECC-reinforced column with different eccentricities is similar. In other words, at the beginning of loading, the ECC compressive strain of the compression side increases linearly. With the increasing load, the slope of the load-ECC compressive strain relationship curve decreases continuously. When it is close to the peaking load, the ECC compressive strain increases significantly faster. From Figure 16 d, it can be seen that the eccentricity ratio has little effect on the compressive strain curve of the longitudinal reinforcement of the load-compression side at the initial stage of loading, which is roughly linear growth. Under the same other conditions, the larger the eccentricity ratio, the lower the bearing capacity of the column, and the compression-strain curve of the longitudinal reinforcement on the load-compression side tends to be flatter. Under the same load, with the increase of eccentricity ratio, the compressive strain of ECC and the compressive strain of compression side longitudinal reinforcement increase.