摘要
预应力FRP能够主动产生约束应力,增加结构的受力与抗疲劳性能,其中预应力损失是影响预应力FRP加固系统效率的关键因素。对预应力锚具目前的研究现状进行了论述,回顾了FRP在结构加固与试验测试过程中预应力损失的研究现状,发现锚具的变形滑移、FRP与加固构件摩擦产生的预应力损失占FRP总损失比例较大,FRP材料自身松弛、外界环境变化、加固构件的变形等产生的预应力损失占FRP总损失比例较小。提出了对FRP加固中预应力损失研究方法和意见,并对今后拟开展的研究工作提出了建议与展望。
FRP(Fiber Reinforced Polymer)is a new type of material with the characteristics of corrosion resistance,high temperature resistance,light weight and small heat capacity.It is widely used in civil engineering because of its high tensile strength.Prestressed FRP can actively produce restraint stress,to increase the stress and fatigue resistance of the structure.Prestress loss is the key factor affecting the efficiency of the prestressing FRP reinforcement system.This paper discusses the current research of the prestressing anchorage,the reviews and summarizes the research of the prestressing loss of FRP in the process of structural reinforcement and test.It is found that the prestressing loss caused by the deformation slip of anchorage.The friction between FRP and reinforcement component accounts to a large proportion of the total loss of FRP.The presupposition was caused by the relaxation of FRP material,the change of external environment and the deformation of reinforcement component.Force loss accounts to a small proportion of total FRP loss.The research methods and opinions on prestress loss in FRP reinforcement are put forward.Finally,suggestions and prospects for future research are put forward.
作者
卢春玲
张哲铭
LU Chun-ling;ZHANG Zhe-ming(College of Civil and Architecture Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Rock-Soil Mechanics and Engineering,Guilin University of Technology,Guilin 541004,China;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi,Guilin University of Technology,Guilin 541004,China)
出处
《桂林理工大学学报》
CAS
北大核心
2020年第4期753-761,共9页
Journal of Guilin University of Technology
基金
国家自然科学基金项目(51568015)
广西创新驱动发展专项项目(桂科AA18118008)
广西自然科学基金项目(2019GXNSFAA245055)。
