Experimental Research and Numerical Simulation of Post-Crack Creep Behavior of SFRC Loaded in TensionMechanics and Physics of Creep, Shrinkage, and Durability of Concrete

This paper mainly studies uniaxial tensile creep behavior of pre-cracked steel fiber reinforced concrete (SFRC). A series of uniaxial tensile creep tests were carried out on SFRC cylinder specimens which were pre-cracked at 0.2mm. The pre-cracked specimens were loaded at the load level of 30% of maximum pre-cracking load for three months under constant temperature of 20 degrees and relative humidity of 60%. Time dependent crack opening displacements (COD) were continuously measured by LVDTs. For the specimens with pre-cracking COD of 0.2mm, the maximum creep deformation is almost the same as the initial elastic deformation. Among the various rheology models, Burgers model was employed to describe the creep behavior. A damage factor was introduced in order to consider the gradual debonding behavior at the fiber/matrix interface.