摘要
国内外学者针对FRP筋混凝土界面静力粘结性能研究主要是基于拉拔试件和梁式试件为主的试验研究,试验参数涉及FRP筋的种类、表面形式、直径、锚固长度以及粘结介质的种类和强度等,在试验的基础上建立了相应的粘结滑移本构模型和临界锚固长度计算式。对FRP筋混凝土梁的疲劳性能研究主要集中在梁疲劳后整体的强度和刚度的变化,而针对FRP筋混凝土界面的局部疲劳粘结性能研究较少,且主要基于等幅疲劳荷载试验,研究成果中也未见疲劳试验参数对粘结本构关系和临界锚固长度的影响。国内学者在疲劳线性损伤累积理论的基础上对FRP筋混凝土结构界面在等幅疲劳荷载、多级等幅疲劳荷载以及随机疲劳荷载等作用下疲劳损伤的剩余强度模型和剩余刚度模型进行了实践和推广应用。FRP筋混凝土界面静力粘结性能研究成果为FRP筋混凝土结构在土木工程中的进一步应用提供了参考,并为后续的疲劳粘结性能研究打下了坚实的基础。但是FRP筋混凝土界面的随机疲劳粘结性能及寿命预测值得进一步探索。
Domestic and foreign scholars study on static bonding performance between FPR bars and concrete is mainly based on experimental study of pull-out specimen and beam specimen.Test parameters are related to the types of FRP,the surface form,diameter,anchorage length and type and strength of the bonding medium,etc. Based on the result of the tests,the constitutive models for bond-slip relation and the calculation method of criti-cal anchorage length are presented.Study on fatigue performance of concrete beams with FRP bars is mainly concentrated on the overall strength and stiffness changes after fatigue load.But there is less study on the local interface fatigue bonding performance between FPR bars and concrete under constant amplitude fatigue load. Present research concerns less the fatigue test parameters effect on bond-slip relation and critical anchorage length.On the basis of the linear fatigue damage accumulation theory,domestic scholars practice and apply the fatigue damage model of residual strength and residual stiffness of FRP reinforced concrete structure under the action of constant amplitude fatigue load,multistage fatigue load and random fatigue load.The research results of interface static bonding performance between FPR bars and concrete provide reference for further application of FRP reinforced concrete structure in civil engineering.Subsequent fatigue bonding performance study has laid a solid foundation.The interface bonding properties under random fatigue load and fatigue life prediction of FRP reinforced concrete expect further exploration.
出处
《桂林理工大学学报》
CAS
北大核心
2014年第4期684-690,共7页
Journal of Guilin University of Technology
基金
国家自然科学基金项目(51208061)
湖南省高校创新平台开放基金项目(12K077)
关键词
桥梁工程
FRP筋
混凝土
粘结
疲劳
损伤机理
bridge engineering
FPR bars
concrete
bond
fatigue
damage mechanism
作者简介
蒋田勇（1978-），男，博士，副教授，桥梁与隧道工程专业，363842987@qq．com。
