For the specimen subjected to a maximum stress lower than 1000 MPa, the fatigue life was longer than 4 million cycles. The results showed that the fatigue life increased linearly with the decrease of the maximum stress in the CFRP tendons. studied the fatigue life of CFRP tendons when the stress ratio was 0.1. The experimental results suggested that for the stress range of 100 MPa, 200 MPa, and 400 MPa, the fatigue lives of CFRP tendons were larger than 3 million cycles when the maximum stresses were lower than 1900 MPa, 1400 MPa, and 1000 MPa, respectively. Saadatmanesh and Tannous studied the effects of the stress range and the maximum stress on the fatigue performance of CFRP tendons. Maximum stress σ m a x and minimum stress σ m i n are two parameters that need to be set in the fatigue performance test of CFRP tendons, which can be used to obtain stress range Δ σ and stress ratio R. The fatigue stability of the anchorage system was also tested. This paper applied this anchorage system to the fatigue performance test of the pre-stressed CFRP tendons. The authors’ research team developed a new wedge-type anchorage system and in applied this new device to the study of long-term creep performance of CFRP tendons. ![]() Due to low transverse strength and the delicate surface of FRP tendons, a dedicated anchorage system for FRP cables needs to be developed. ![]() Stable and reliable anchorages are key to applying FRP cables to practical application. Therefore, a study on the high-precision prediction method of fatigue life of CFRP cables is required. Fatigue rapture may bring disastrous consequences due to its burstiness. Cable structures bear repetitive loads during their service life. Among all FRPs, CFRP has the properties of superior fatigue resistance, high-creep rupture limit, low-creep performance, and other benefits, which has deemed it as the most ideal cable material to replace steel, thereby realizing the long life of major engineering structures. On the basis of the fiber variety, FRP can be classified into glass fiber-reinforced polymer (GFRP), carbon fiber-reinforced polymer (CFRP), basalt fiber-reinforced polymer (BFRP), and aramid fiber-reinforced polymer (CFRP), among others. The predicted results of Whitney’s method showed that, at a 95% confidence level, when the stress range was 200 MPa, 400 MPa, and 600 MPa, the maximum stress limit of CFRP tendons, which were not broken in a fatigue test of 2 million times, was 63.9% f u, 53.0% f u, and 36.8% f u, respectively.įiber-reinforced polymer (FRP) composites have the characteristics of light weight, high strength, corrosion resistance, and electromagnetic insulation, which can replace steel for engineering construction in particular scenarios. The error of predicted results and test results was 0.038 and 0.083, respectively, both representing good prediction accuracy. A bilinear equation and a linear equation considering the fatigue life of CFRP tendons jointly affected by the stress range and the maximum stress were established. ![]() The main work and results were that the stress range and stress level (maximum stress) were two key parameters affecting the fatigue life of CFRP tendons. ![]() In the test and analytical data, the fatigue stress ranged from 200 MPa to 800 MPa, and maximum stresses from 0.37 to 1.0 f u ( f u = ultimate tensile strength of CFRP tendons) were determined. A new wedge-type anchorage system was applied to the fatigue test of CFRP tendons and demonstrated an excellent fatigue resistance. The fatigue life of carbon fiber reinforced polymer (CFRP) tendons was studied in this paper.
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