钢筋-再生混凝土黏结滑移性能试验

发布时间：2019-04-25 23:41

【摘要】：为研究钢筋与再生混凝土界面黏结性能和本构关系,考虑再生粗骨料取代率、再生细骨料取代率、钢筋类型、钢筋直径、锚固长度的影响,设计了15个梁式试件进行钢筋-再生混凝土黏结滑移性能试验.综合分析上述变量对荷载-滑移曲线、黏结强度、黏结效率的影响规律,给出了黏结-滑移本构关系的建议.结果表明:随再生粗骨料取代率增加,钢筋与混凝土之间的黏结强度减小,而抗滑移能力增强;再生细骨料的加入,导致再生混凝土的黏结性能明显退化;螺纹钢筋与再生混凝土的黏结强度约为光圆钢筋的2倍;钢筋与再生混凝土的界面黏结性能随着钢筋直径和锚固长度的增加而降低;建议的钢筋-再生混凝土的黏结-滑移本构关系和参数,与试验结果拟合较好.
[Abstract]:In order to study the interfacial bonding behavior and constitutive relationship between rebar and recycled concrete, the influence of the substitution rate of recycled coarse aggregate, recycled fine aggregate, type of steel bar, steel bar diameter and anchoring length is considered. Fifteen beam specimens were designed to test the bond slip behavior of rebar-recycled concrete. The influence of the above variables on the load-slip curve, bond strength and bonding efficiency is comprehensively analyzed, and the suggestion of the bond-slip constitutive relation is given. The results show that the bond strength between steel bar and concrete decreases and the anti-slip ability increases with the increase of recycled coarse aggregate substitution rate, and the adhesion performance of recycled concrete is degraded obviously with the addition of recycled fine aggregate. The bonding strength of threaded steel bar with recycled concrete is about 2 times that of circular steel bar, and the interfacial bonding property between rebar and recycled concrete decreases with the increase of steel bar diameter and anchoring length, and the bonding strength between rebar and recycled concrete is about 2 times that of circular steel bar. The proposed bond-slip constitutive relation and parameters of reinforced-recycled concrete are in good agreement with the experimental results.
【作者单位】：城市与工程安全减灾教育部重点实验室(北京工业大学);
【基金】：国家重点研发计划(2017YFc0703304) 国家自然科学基金重点项目(51438007)
【分类号】：TU375

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