基于线性黏聚力模型的FRP筋锚固长度计算方法

为了研究FRP筋在混凝土中最小锚固长度的一般计算方法，依据应变能等效原则将FRP筋混凝土的黏结滑移曲线转化为线性黏聚力模型，在FRP筋混凝土拉拔试件微分单元受力分析的基础上，推导出了最小锚固长度的计算公式，并通过算例进行了验证和对比分析。算例表明，该计算方法与现有的几种计算方法吻合较好，其计算值相差都在15%以内。不同的黏结滑移模型对FRP筋锚固长度影响不大，最大仅相差8%。结果表明，基于线性黏聚力模型推导的FRP筋在混凝土中最小锚固长度计算公式正确可行。

Computational method of development length for bond of FRP bars to concrete based on linear conhesive zone model

To investigate the general computational method of minimal development length for bond of fiber reinforced polymer (FRP) bars to concrete, converting the bond slip model to linear cohesive zone model on the equivalence of strain energy, acalculation formula was derived from the force analysis of the differential element for bond of FRP bars to concrete. Verification and comparative analysis on the formula were made. It shows that results calculated by the formula agree well with those by typical methods and the relative differences are less than 15%. It also proves that the bond slip models have little effect on the development length and the differences are less than 8%. The results indicate that the formula based on linear conhesive zone model is sound and feasible.