Mechanical properties of axially and eccentrically loaded CFRP-coral concrete columns

The eccentrically loaded bearing capacity tests on 6 CFRP reinforced coral concrete short columns were carried out. Parameters such as the ultimate bearing capacities, the stress of CFRP bars and surface concrete were measured and analyzed. The results showed that all the columns failed due to the crushing of concrete in the compression zone. Meanwhile, the increase of eccentricity not only decreased the ultimate bearing capacity, but also resulted in the shear fracture of CFRP longitudinal bars in compression zone. In general, the stress of longitudinal CFRP reinforcements in all specimens were always in quite low level. The maximum stress of CFRP bars in columns was just 105.78 MPa, only 23.5% of the ultimate compressive strength of CFRP reinforcement. The superior bonding performance between the CFRP bars and coral concrete conformed to the deformation coordination. Subsequently, the calculation method for bearing capacity of CFRP-coral concrete short columns was put forward, and the calculated results agreed well with the tested results.