不同加载路径下玻璃纤维复材筋黏结性能试验研究  

EXPERIMENTAL RESEARCH ON BONDING PERFORMANCE OF GFRP BARS UNDER DIFFERENT LOADING PATHS

作　　者：金清平[1] 王璐 高永红[1] 

机构地区：[1]武汉科技大学城市建设学院,武汉430065

出　　处：《工业建筑》2017年第11期10-14,共5页Industrial Construction

基　　金：国家自然科学基金项目(51278391);武汉市城建委科技计划项目(201553)

摘　　要：玻璃纤维复材(GFRP)筋与砂浆的黏结性能是其应用于土钉支护结构中重要的参数。对6组不同直径和不同埋深的GFRP筋砂浆拉拔试件进行单调和循环拉拔试验,研究GFRP筋与砂浆黏结性能。结果表明:GFRP筋在砂浆中的拉拔破坏模式与长度锚固相关;砂浆强度对20筋体极限黏结强度影响不大,而对22、25筋体的黏结强度发挥有影响;分级循环加载拉拔中,黏结滑移曲线均会发生斜率的变化,且在拉拔力卸载后出现一段残余变形,存在非线性变形,在化学胶着力消失后,滑动摩擦力与机械咬合力呈现线性特征;GFRP筋与砂浆黏结滑移本构模型中,τ-s曲线上升段与改进的BPE模型的上升段趋势吻合,但还需进一步研究模型参数。Bonding performance between GFRP bars and mortar is a key parameter for the application in soil nailing bracing structure.6 groups of specimens with different diameters and different depths were tested by monotonic loading and cyclic loading,and to study the bonding performance between GFRP bars and mortar.The results showed that the tensile failure mode that GFRP bars was pulled out from the mortar was related to anchorage length.The strength of the mortar had little effect on bonding strength of 20,but affected the bonding strength of 22 and 25;in pull-out test by step and cycle loading,the slope of bond-slip curve changed,and there was a residual deformation after unloading,and that was a nonlinear deformation.When the chemical adhesive force disappeared,the sliding friction force and mechanical interaction presented linear mechanical characteristics.For the constitutive model of bond-slip between GFRP bars and mortar,the upward section of τ-s curve was consistent with that of modified BPE model in trend,but the model parameters need to be further studied.

关 键 词：GFRP筋 单调加载 循环加载 拉拔试验 黏结性能 

分 类 号：TU528[建筑科学—建筑技术科学]