不同加载路径下玻璃纤维复材筋黏结性能试验研究

发布时间：2018-06-03 02:17

本文选题：GFRP筋 + 单调加载　；参考：《工业建筑》2017年11期

【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;砂浆强度对鐖20筋体极限黏结强度影响不大,而对鐖22、鐖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。
[Abstract]:The bonding property of GFRP- reinforced glass fiber reinforced concrete (GFRP) bars with mortar is an important parameter in its application to soil nailing support structures. The monotonic and cyclic drawing tests were carried out on six groups of GFRP reinforced mortar drawing specimens with different diameters and different buried depths. The adhesive properties of GFRP bars and mortar were studied. The results show that the tensile failure mode of the GFRP bars in mortar is related to the length of anchoring, the strength of mortar has little effect on the ultimate bonding strength of 20 bars, but it has an effect on the bonding strength of the two bars. The slippage curve of the bond will change in slope, and there will be a residual deformation after unloading of the drawing force, there is nonlinear deformation, and after the chemical adhesive force disappears, In the constitutive model of sliding friction force and mechanical bite force, the rising section of 蟿 -s curve is consistent with that of the improved BPE model, but the model parameters need to be further studied.
【作者单位】：武汉科技大学城市建设学院;
【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)
【分类号】：TU528

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