Yang Dong, Zhang Jiwen, Song Shoutan, Zhou Fei, Wang Chao
School of Civil Engineering, Southeast University, Nanjing 210096, China.
Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China.
Materials (Basel). 2018 Nov 14;11(11):2273. doi: 10.3390/ma11112273.
Carbon fiber reinforced polymer (CFRP) tendons are generally used as prestressing members to take full advantage of their high strength. Their creep property is one of the key factors influencing the reliability and safety of the structures, especially under sustained high stress. In this study, using a new wedge-type anchorage system, experimental research was carried out on the creep behavior of CFRP tendons under high stress levels from 0.69 to 0.85 . All the tests lasted for a duration of 1000 h. It was found that the creep coefficient tends to increase with the stress level. Compared to their static properties, the residual strength of CFRP tendons after creep tests is 4.54% lower while the after-creep elastic modulus is 6.99% higher. Through data analysis, a semi-logarithm linear relationship between the creep coefficient and time was established, and the creep coefficients at 1 million hours were extrapolated.
碳纤维增强聚合物（CFRP）筋通常用作预应力构件，以充分利用其高强度。其徐变性能是影响结构可靠性和安全性的关键因素之一，尤其是在持续高应力作用下。在本研究中，采用一种新型楔形锚固系统，对CFRP筋在0.69至0.85的高应力水平下的徐变行为进行了试验研究。所有试验持续1000小时。结果发现，徐变系数趋于随应力水平的增加而增大。与静态性能相比，CFRP筋在徐变试验后的残余强度降低了4.54%，而徐变后弹性模量提高了6.99%。通过数据分析，建立了徐变系数与时间的半对数线性关系，并外推了100万小时时的徐变系数。
