Long-term behavior of FRP prestressed concrete beams-a review

doi:10.19936/j.cnki.2096-8000.20220428.018

Abstract

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

CLC Number:

TB332

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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