The serviceability of FRP prestressed concrete(FRP-PC)beams under sustained loading would be affected by the excessive long-term additional deflection,which is caused by the coupled effect of creep and relaxation of FRP tendons,and shrinkage and creep of concrete.A systematic review of the research progress on the long-term performance and design methods of FRP-PC beams was carried out.Firstly,the creep and relaxation properties of FRP tendons were introduced and the prediction methods were summa-rized.Secondly,the relevant results related to the past 20-year-research on the experiments of long-term performance of bonded prestressed concrete beams and externally prestressed concrete beams were conclu-ded.The time-dependent finite element analysis method based on the age-adjusted effective modulus meth-od(AEMM)or the integral-type creep model was summarized,and the corresponding parametric results were introduced.In addition,the similarities and differences of calculation theories and the simplified methods were analyzed.Finally,the future research on the long-term performance of FRP-PC beams was suggested.
关键词
FRP筋/松弛蠕变/收缩徐变/长期性能/试验研究/时随有限元分析/计算理论
Key words
FRP tendon/creep and relaxation/creep and shrinkage/long-term behavior/experiments/time-dependent finite element analysis/calculation theories
维普
万方数据