Performance Optimization Analysis of Hybrid Fiber Reinforced Concrete in Building Structure

Abstract

Hybrid fiber reinforced concrete (HFRC) is a kind of multiphase composite material formed by steel fiber and polypropylene fiber reinforced concrete matrix. This kind of material is superior to single-phase composite in many aspects. In this paper, a finite element model with high agreement with the experimental hysteretic curve and skeleton curve is established by reasonably selecting the element type, material constitutive relation and failure criterion. In this paper, the bearing capacity, ductility, energy dissipation capacity and stiffness degradation of hybrid fiber reinforced concrete columns under cyclic loading are studied. The results show that fiber can improve the bearing capacity, ductility, energy dissipation capacity and stiffness degradation of concrete. The ductility of hybrid fiber reinforced concrete is better than that of steel fiber reinforced concrete, but the advantages of bearing capacity, energy dissipation capacity and stiffness degradation are not obvious. The research results have a certain reference value for the performance analysis of hybrid fiber reinforced concrete materials in building structures.