COMPLETE STRESS-STRAIN BEHAVIOR OF HIGH-STRENGTH CONCRETE UNDER COMPRESSION

A series of compression tests were conducted on 3 x 6 in. (76.2 x 152. 4 mm) cylindrical specimens using a modified testing method that gave the complete stress-strain behaviour for high-strength concrete with o r without tie confinements. Empirical equations are proposed to repres ent the complete stress-strain relationships of unconfined and confine d high-strength concretes with compressive strength exceeding 10 kip/i n(2) (69 MPa). Various parameters were studied and their relationships were experimentally determined. The proposed empirical stress-strain equations are compared with actual cylinder tests under axial compress ion, and are found to agree well.