碳纤维与混凝土界面粘贴强度的精确测量方法

针对目前碳纤维与钢筋混凝土界面粘贴强度的测量方法还没有相应的规范,基于静力平衡原理推导出在拉伸状态下,碳纤维的拉应变与钢筋混凝土界面之间剪应力的定量关系,通过应变率确定界面之间的剪应力。在试验方面实现了理论推导公式中基本力学量的测量方法,并得到测量结果;在数据处理方面,采用函数拟合方法得到应变沿试件长度方向变化的函数关系,进而得到剪应力的分布规律和最大剪切应力。应用该方法可以为碳纤维加固钢筋混凝土设计提供可靠的设计参数。

Accurate method for measuring bonding strength of interface between carbon fiber and concrete

Facing the relevant criterion is not established about the accurate measurement of bonding strength between carbon fiber and concrete, on the basis of the principle of the static force equation, the quantitative relationship between the tensile strain in carbon fiber and the shearing strength of the concrete was derived under the tensile status ultimately. The basic mechanical variable in the theoretical formula is measured by experiment. The function relation of strain along the length of the specimen can be gotten through function fitting. Then the distribution rule of shearing strength and shear intensity can also be obtained. The reliable design parameters can be obtained by the presented method for the design of the carbon fiber reinforced concrete beams.