纤维塑料筋混凝土梁长期性能研究进展

对国内外纤维塑料筋(FRP筋)混凝土梁长期性能试验、时随分析和设计计算方法的研究进展进行综述与分析:首先介绍不同种类FRP筋的应力松弛试验,研究表明AFRP筋的应力松弛较CFRP筋更为显著;总结预应力与非预应力FRP筋混凝土梁长期性能试验,研究表明采用AFRP筋或较低强度混凝土时,梁的长期变形相对较大;分别阐述基于截面时随曲率的非预应力FRP筋混凝土梁时随分析方法和基于龄期调整有效模量的预应力FRP筋混凝土梁截面时随分析方法;介绍非预应力FRP筋混凝土梁和预应力FRP筋混凝土梁长期变形的设计计算方法;最后对今后FRP筋混凝土梁长期性能研究的发展趋势进行展望。

Progress of studies on Long-term Behavior of concrete Beams Reinforced/Prestressed with FRP Bars

The progress of experimental studies,time-dependent analysis and design calculating methods on the long-term behavior of concrete beams reinforced/prestressed with various types of FRP bars were reviewed and analyzed.First,the stress relaxation experiments of FRP bars were introduced,the results show that the stress relaxation of AFRP bars is larger than that of CFRP bars.The long-term experimental studies of concrete beams reinforced/prestressed with FRP bars were summarized,the results show that the long-term deflections of the concrete beams reinforced with AFRP bars or low-strength concrete beams are relatively larger.The time-dependent analytical methods of concrete beams reinforced with FRP bars based on the cross-section time-dependent curvature and the concrete beams prestressed with FRP bars based on the age-adjusted effective modulus were expounded,respectively.The calculating methods for designing long-term deflection of concrete beams reinforced/prestressed with FRP bars were introduced.Finally,the future development of studies on the long-term behavior of concrete beams reinforced/prestressed with FRP bars as prospected.