Tensile mechanical model of textile reinforced concrete

Uniaxial tensile experiments of yarns and textile reinforced concrete (TRC) plates were carried out to study the stress-strain relationship of the epoxy resin-impregnated textile. The experimental results show that even if the carbon fiber yarn is impregnated with the epoxy resin, its tensile strength is not fully utilized. Besides some nonlinear characteristic of its stress-strain curve after the tensile stress of the yarn reaching about 80% of its ultimate strength, its stress-strain relationship is almost linear when the carbon fiber yarn is tensioned alone. Assume that only the textile bears the load after fine grained concrete cracking, and thus the stress-strain relationship of the carbon fiber yarn, which was obtained from the curves of the load-deformation with uniaxial tensile test of TRC-thin plate specimens, could be reasonably simplified as the bilinear form, and the corresponding control parameters of the textile in this study were presented. Based on the flexural calculation theory and using the tensile model of the yarn proposed in this paper, the obtained calculated values of two series of flexural members coincide well with their experimental values.