Abstract
The tensile properties of fiber-reinforced composites (FRP) under various factors of composite aging were studied by tensile test. The test parameters mainly include temperature, salt spray, ultraviolet, rainwater, and stress. The results show that the higher the temperature, the faster the FRP tensile strength decreases; At the same temperature, the ultraviolet radiation has little effect on BFRP bars. Salt spray and rainwater hydrolyze the resin on the surface of the steel bars and expose the inner steel bars. Stress can accelerate the degradation of tensile properties of FRP bars. It has little effect on the elastic modulus of FRP bars. A scanning electron microscope (SEM) was used to observe the changes of steel bars and the mechanism of mechanical property degradation was studied
Highlights
In long-span cable-stayed Bridges, the corrosion of steel cables is the main reason that affects the service life of Bridges
The change of tensile properties of fiber-reinforced composites (FRP) bars was studied through the tensile test, and the influence of temperature, salt spray, rain, ultraviolet ray, and stress level on the tensile strength and tensile elastic modulus of FRP bars was studied
After aging under various conditions, the specimens were subjected to uniaxial tensile test and scanning electron microscope (SEM) observation
Summary
In long-span cable-stayed Bridges, the corrosion of steel cables is the main reason that affects the service life of Bridges. In the offshore areas, long-span cablestayed Bridges are faced with the influence of seawater salt solution or salt spray, rainwater, ultraviolet light, high temperature, and high stress. High-performance FRP cable provides an effective way to replace steel cable for the construction of a cable-stayed bridge with a larger span due to its characteristics of lightweight, high strength, fatigue resistance, and corrosion resistance [2,3]. It is necessary to study the aging properties of FRP bars under various conditions. The change of tensile properties of FRP bars was studied through the tensile test, and the influence of temperature, salt spray, rain, ultraviolet ray, and stress level on the tensile strength and tensile elastic modulus of FRP bars was studied. The tensile properties were tested under the action of multi-factor composite aging
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