超高性能混凝土与钢筋的粘结-滑移本构关系试验研究  

Experimental study on the bond⁃slip constitutive relationship between ultra⁃high performance concrete and steel bar

作　　者：李新星 周泉 李水生 LI Xinxing;ZHOU Quan;LI Shuisheng(China Construction Fifth Engineering Division Co.,Ltd.,Changsha 410004,China;Hunan China Construction Fifth Bureau Green Municipal Engineering Research Center Co.,Ltd.,Changsha 410004,China)

机构地区：[1]中国建筑第五工程局有限公司,长沙410004 [2]湖南中建五局绿色市政工程研究中心有限公司,长沙410004

出　　处：《建筑结构》2025年第6期53-60,共8页Building Structure

基　　金：湖南省自然科学基金(2023JJ70025、2023JJ30611);湖南省科技创新计划(2024JK2047)。

摘　　要：为研究超高性能混凝土(UHPC)和含小型粗骨料超高性能混凝土(CA-UHPC)与钢筋的粘结-滑移本构关系,设计制作了20组以锚固长度和保护层厚度为变量的试件,开展拔出试验,分析了锚固长度、保护层厚度和钢筋直径对粘结性能的影响。结果表明:试件破坏模式包括钢筋拔出破坏和拔断破坏;粘结强度随着锚固长度的增加而降低,增大保护层厚度对粘结强度有一定的提高,在锚固长度大于3d时,粘结强度提高不明显;峰值滑移随着锚固长度的增大,表现出先减小后增大再减小的趋势,增大保护层厚度对峰值滑移有不同程度的提高。基于试验数据提出了粘结-滑移特征值计算公式,建立的UHPC与钢筋的粘结-滑移本构关系,与文献结果吻合较好。In order to study the bond slip constitutive relationship between ultra⁃high performance concrete(UHPC),ultra⁃high performance concrete containing small coarse aggregate(CA⁃UHPC)and steel bar,20 groups of specimens with anchorage length and protective layer thickness as test variables were designed and made,and pull out tests were carried out to analyze the effects of anchorage length,protective layer thickness and steel bar diameter on bond properties.The results show that the failure modes of the specimens include pull out failure and tensile fracture failure of steel bar.The bond strength decreases with the increase of anchorage length,and increasing the thickness of the protective layer has a certain improvement on the bonding strength,but the bond strength does not increase obviously when the anchorage length is larger than 3d.With the increase of anchorage length,the peak slip shows a trend of first decreasing,then increasing,and then decreasing again.The increase of protective layer thickness increases the peak slip in different degrees.Based on the experimental datas,a formula for calculating the eigenvalues of bond and slip was proposed.The bond and slip constitutive relationship between UHPC and steel bar is in good agreement with the literature results.

关 键 词：超高性能混凝土 粘结强度 锚固长度 保护层厚度 粘结-滑移本构关系 

分 类 号：TU375[建筑科学—结构工程]