ANALYSIS OF MECHANIC INFLUENCING FACTOR FOR FRP-CONFINED CONCRETE

摘要

As a type of new artificial complex material, FRP (Fiber reinforced polymer) has been widely used to strengthen existing civil construction, due to their advantages in high tensile strength, light weight, convenience to construct, perfect corrosion resistance, no influence on concrete section size etc. It is necessary to clearly understand the mechanical property of concrete with FRP. In the last decade, many researches have been conducted to explore the constitutive relationship and strength of the confined concrete. However, few of them have fally and detailedly studied the relative factors of FRP-confined concrete. For the purpose of better application of FRP on civil engineering, through numerical simulation and analysis, the influencing factors of FRP-confined concrete has been studied in the last ten years. These influencing factors include confinement ratio, section shape, concrete compressive strength and FRP Young's modulus, tension strength and strain. In this paper, these influencing factors are further studied to get why and how these factors influence the mechanical property of FRPconfined concrete, such as the relationship curve between confinement ratio and confinement efficiency, confinement stress distribution with different section shape and stress-strain behavior under different restraint stiffness, etc. The numerical simulation is carried out by using finite element software ANSYS.