低温下纤维聚合物筋混凝土的黏结机理及锚固长度计算研究

Bonding mechanism and calculation method of anchorage length of fiber-reinforced polymer concrete at low temperature

为深入研究聚合物筋与混凝土黏结强度的影响因素和机理,确定采用聚合物筋时混凝土结构所需要的最小锚固长度,以聚合物筋和混凝土为研究基础,通过建立简单的拉拔试验和梁式试验模型,对不同受力情况下聚合物筋与混凝土黏结强度关系进行验证和分析,详细讨论了混凝土强度、聚合物筋的直径、聚合物筋埋长以及混凝土保护厚度等影响机理。结果表明,聚合物筋与混凝土黏结性能随着其直径减小而增大。当聚合物筋直径一定时,埋长越短,则黏结强度越大。同时计算得到基本锚固长度需要考虑顶部修正系数和混凝土保护厚度修正系数。

In order to deeply study the influencing factors and mechanism of the bond strength between polymer bars and concrete,and determine the minimum anchoring length required for concrete structures when using polymer bars,it uses polymer bars and concrete as the basis for the study.The pull-out experiments and beam-type experimental models verify and analyze the bond strength between polymer bars and concrete under different loading conditions.The concrete strength,the diameter of polymer bars,the buried length of polymer bars,and concrete protection are discussed in detail.Influence mechanism such as thickness.The results show that the adhesion between polymer bars and concrete increases with decreasing diameter.When the diameter of the polymer rib is constant,the shorter the buried length,the greater the bonding strength.At the same time,the calculation of the basic anchor length needs to consider the correction factor for the top and the correction factor for the concrete protection thickness.