FRP筋锚杆拉拔试验剪切刚度变化及损伤力学模型  

SHEAR STIFFNESS AND DAMAGE MECHANICS MODEL OF FRP BAR BOLT IN PULL-OUT TEST

作　　者：杨钊 乔春生[1] 陈松 YANG Zhao;QIAO Chunsheng;CHEN Song(School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China;School of Urban Geology and Engineering,Hebei University of Geosciences,Shijiazhuang 050031,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]河北地质大学城市地质与工程学院,石家庄050031

出　　处：《力学与实践》2020年第6期758-765,共8页Mechanics in Engineering

基　　金：国家自然科学基金资助项目(51278046)。

摘　　要：为了研究纤维增强塑料(fiber reinforced plastic,FRP)筋锚杆锚浆界面剪切刚度的变化规律,对多组试验数据的剪切刚度进行计算分析拟合,得到FRP筋锚杆锚浆界面剪切刚度随剪切位移呈指数衰减的变化规律。结合损伤力学理论,基于等效应变假定,分别建立基于Weibull和幂函数分布的剪应力与剪切位移模型,与拟合得出的规律对比,结果表明:基于拟合得出的规律以及Weibull概率分布所建立的模型与试验数据较为吻合,FRP筋锚杆锚浆界面剪切刚度的劣化规律随着剪切位移增大呈指数形式,并在此基础上进行了锚杆的传力分析。To study the variation of the interface shear stiffness of fiber reinforced plastic(FRP)bar bolt and grout,several groups of test data for the shear stiffness are analyzed and fitted into curves,and the curves of the interface shear stiffness of FRP bar anchor bolt against the shear displacement are in exponential variation.Combined with the damage mechanics theory,based on the equivalent strain assumption,the shear stress and shear displacement models with Weibull and power function distributions are established,respectively.It is shown that the model established based on the fitting law and the Weibull probability distribution is in good agreement with the experimental data.The degradation of the interface shear stiffness of FRP bar bolt and grout is closely related with the shear position,and based on this,the force transfer analysis of the bolt is carried out.

关 键 词：纤维增强塑料筋锚杆 剪切刚度 韦布尔分布 幂函数分布 

分 类 号：TU452[建筑科学—岩土工程]