摘要
采用文献中的FRP-混凝土粘结单剪试验的355组试验数据,对5个界面粘结强度模型进行了分析评估;对其中的两个界面粘结强度模型进行了修正和重新评估。以剪切试验中的几何参数与粘结材料的力学性能作为自变量,以试验中得到的界面粘结强度为因变量,提出了两种不同参数为独立变量方法回归模型,得到了非线性方程,提出了长度效应系数与宽度效应系数的概念。对实验数据结果及粘结强度模型计算分析表明:理论预测与试验值有不同程度的精确性;FRP粘结长度是影响粘结强度的一个独立变量,给出的非线性模型不仅有更高的精度,且无需另外定义有效粘结长度。长度效应系数可以用来修正未考虑粘贴长度影响的近似解析模型。
Through 355 published group experimental data from single-lap shear test are introduced to analyze and evaluate 5 interface bond strength models on FRP-concrete bond system,two of which are modified and re-evaluated. Furthermore,another two nonlinear regression analysis models are proposed,where the interface bond strength are considered as a function in terms of the geometrical parameters and mechanical property parameters. In these nonlinear models,the concept of the length effect constant and width effect constant are proposed. Through the comparison of the experimental data and the model output,the following conclusions was obtained. In varying degrees,the theoretical predictions are in agreement with the experimental datas. The FRP bond length can be considered as a dependent variable to the bond strength. The multiple nonlinear regression models is more accurate without additionally redefining the effect bond length. The length effect constant can be used to modify the models without considering the influence of the bond length.
出处
《科学技术与工程》
北大核心
2016年第11期222-227,239,共7页
Science Technology and Engineering
基金
国家自然科学基金项目(11242006
11462005)资助
关键词
FRP
凝土
界面
粘结强度
断裂能
FRP
concrete
interface
bond strength
fracture energy
