Research on Damage Evolution of Polypropylene Fiber Concrete under Splitting Load

Based on Moelands-Reinhardt single parameter power exponent constitutive equation and Equivalent stain hypothesis, preliminary damage evolution equation of polypropylene fiber concrete is derived. To eliminate mesh correlation of element characteristic length and reflect the action of tensile strength and fracture energy to damage evolution, modified polypropylene fiber concrete's damage evolution equation is deduced from the preliminary damage evolution equation. The modified damage evolution equation is proved by comparing the Load-displacement curve get from splitting test and theoretical Load-displacement curve obtained by damage FEM calculation. Through the splitting test, it is showed that the modified damage evolution equation reflects the action of polypropylene fiber volume ratio and aspect ratio to polypropylene fiber's damage evolution.