FRP筋预应力混凝土梁长期性能研究进展

doi:10.19936/j.cnki.2096-8000.20220428.018

摘要/Abstract

摘要： FRP筋复合材料因具有轻质高强和优异的耐久性能被广泛用于土木工程结构中。然而,偏低的弹性模量可能导致FRP筋增强混凝土梁(RC)出现挠度过大等适用性问题,因此近年来FRP筋预应力结构得到了越来越多的关注。本文从材料和结构两个层面对FRP筋预应力混凝土梁的长期性能进行了综述,系统阐述了FRP筋的蠕变和松弛性能及影响因素,总结了FRP筋预应力混凝土梁的长期持荷试验和有限元分析成果,介绍了基于龄期调整有效模量法的梁截面时变分析方法以及FRP筋预应力梁长期挠度计算公式。研究表明FRP筋的应力松弛较钢绞线严重;不同种类的FRP筋中,CFRP筋的抗松弛性能最好。同时,CFRP筋预应力混凝土梁的长期挠度也低于钢绞线预应力混凝土梁。本文最后对现有FRP筋预应力混凝土梁的不足之处提出了研究建议。

关键词: 纤维增强复合材料, FRP, 蠕变, 松弛, 预应力, 长期性能, 计算模型

Abstract: FRP bar composites have been widely used in civil engineering structures because of their light weight, high strength and excellent durability. However, low elastic modulus may lead to applicability problems such as excessive deflection of FRP reinforced concrete beams (RC). Therefore, FRP prestressed structures have received more and more attention in recent years. In this paper, the long-term performance of prestressed concrete beams with FRP bars is reviewed from the material and structure levels, the creep and relaxation properties of FRP bars and their influencing factors are systematically described, and the long-term load-holding test and finite element analysis results of FRP bars are summarized. The time-varying analysis method of beam section based on age adjusted effective modulus method and the calculation formula of long term deflection of prestressed FRP beams are introduced. The results show that the stress relaxation of FRP bars is more serious than that of steel strand wires. Among different FRP bars, CFRP bars have the best anti-relaxation performance. At the same time, the long-term deflection of CFRP prestressed concrete beam is lower than that of steel strand prestressed concrete beam. At the end of this paper, some research suggestions on the shortcomings of the existing FRP bars prestressed concrete beams are put forward.

Key words: fiber reinforced polymer, FRP, creep, relaxation, prestressed, long-term performance, calcula- tion model

中图分类号:

TB332

于雯, 黄悦, 黄谦, 刘晓阳, 冯伟, 郭瑞鹏. FRP筋预应力混凝土梁长期性能研究进展[J]. 复合材料科学与工程, 2022, 0(4): 111-119.

YU Wen, HUANG Yue, HUANG Qian, LIU Xiao-yang, FENG Wei, GUO Rui-peng. Long-term behavior of FRP prestressed concrete beams-a review[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(4): 111-119.

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