It has been widely recognized that the constitutive model plays an essential role in engineering application of high ductile fiberreinforced\nconcrete (HDC). In this research, uniaxial compressive tests were conducted on nine groups of HDC specimens with\ndifferent mixture ratios and one group of mortar matrix specimens as comparison, discussing the effect of fiber content, watercement\nratio, fly ash content, and sand-binder ratio. According to the characteristics of stress-strain curve of HDC under uniaxial\ncompression, a damage constitutive model was proposed by introducing two damage threshold parameters and then was\ncompared with other existing models. Results indicated that the damage model curves suggested in this paper were best consistent\nwith experimental curves and substantially demonstrate the damage evolution process as well as the cracking resistance effect of\nfiber bridging stress.
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