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为研究型钢高强混凝土界面黏结性能,对9个型钢高强混凝土试件进行推出试验,分别考虑混凝土强度、配箍率、保护层厚度和型钢锚固长度对型钢高强混凝土界面黏结性能的影响。观察试件的加载过程和裂缝发展形态,分析了试件破坏形态,得到试件加载端荷载-滑移曲线。通过分析沿型钢锚固方向应变和界面黏结应力的分布规律,运用灰色关联理论建立了黏结应力计算式,并推导出荷载-滑移曲线关系表达式。讨论了影响界面滑移损伤变量的关系。结果表明:各试件加载端荷载-滑移曲线走势基本相同;灰色关联理论能够较好地反映黏结应力与各影响因素之间的关系,其中保护层厚度与黏结应力相关性最好;推导的黏结应力算式的计算精度能达到98%;提出的黏结应力-滑移的本构关系数学表达式拟合度较好;界面损伤发展程度与各影响因素关系紧密。
In order to study the interfacial bond behavior of steel reinforced high-strength steel beam, nine sections of high-strength concrete specimens were put forward. The influence of concrete strength, stirrup ratio, thickness of protective layer and anchorage length of steel beam on the interfacial adhesion properties were considered. The loading process and crack development morphology of the specimen were observed. The failure morphology of the specimen was analyzed and the load-slip curve was obtained. By analyzing the distribution of stress and strain along the anchorage direction of steel beam, the formula of the bond stress was established by the gray relational theory and the expression of load-slip curve was derived. Discusses the impact of interface slip damage variables. The results show that the load-slip curves at loading end of each specimen are basically the same. The gray correlation theory can well reflect the relationship between the bond stress and each of the influencing factors, and the correlation between the thickness of the protective layer and the bond stress is the best. The calculation accuracy of the bond stress formula can reach 98%. The proposed mathematical expression of the bond stress-slip constitutive relation has a good fitting degree. The degree of the interface damage development has a close relationship with all the influencing factors.