STRESS-STRAIN BEHAVIOR OF STEEL-FIBER HIGH-STRENGTH CONCRETE UNDER COMPRESSION

A series of compression tests were conducted on 3 x 6-in. cylindrical specimens using a modified test method that gave the complete stress-s train behavior for high-strength steel-fiber concrete with or without tie confinements. The volume fractions of steel fiber in the concrete were 0, 0.5, 0.75, and 1 percent, respectively. Empirical equations ar e proposed herein to represent the complete stress-strain relationship s of high-strength steel-fiber concrete with compressive strength exce eding 10,000 psi. Various parameters were studied and their relationsh ips were experimentally determined. The proposed empirical stress-stra in equations have been compared to actual cylinder tests under axial c ompression and were found to be in good agreement.