GFRP筋—混凝土粘结性能影响参数的灰色关联分析

摘要

灰色系统具有“少数据建模”的特点,着重研究概率统计、模糊数学所不能解决的“小样本、贫信息”的不确定问题.基于已有玻璃纤维(GFRP)筋—混凝土粘结性能试验研究的资料,运用灰色系统理论的关联度分析方法研究GFRP筋—混凝土粘结性能影响参数关联计算的技术.考虑的影响参数包括GFRP筋直径、肋高度、肋间距.灰色关联分析结果表明,对GFRP筋—混凝土粘结强度的影响程度从大到小排序依次为GFRP筋肋高度、直径、肋间距；对滑移的影响程度从大到小排序依次为GFRP筋直径、肋高度、肋间距.在关联分析基础上,构建了考虑各影响参数组合权系数的滑移计算模型,并回归出系数向量,公式计算值与试验值吻合良好.%Grey relational analysis has the advantage of modeling with poor data which probability statistics or fuzzy mathematics can't deal with. Based on the test data of bond between glass fiber reinforced polymer ( GFRP) rods and concrete,the technique of analyzing the influence parameters to bond performance using grey relational method is presented in this paper. The influence parameters include the diameter,rib height and rib spacing of GFRP rods. The results of grey relational analysis indicate the influential order on the bond strength from large to small is the rib height,diameter and rib spacing, while the influential order on slip from large to small is diameter, rib height and rib spacing. A slip calculating model considering the coefficients of combination weight is established based on the relational analysis and the coefficient vector is obtained by regression. The calculated results agree well with the experimental results.