钢-聚丙烯混杂纤维混凝土与变形钢筋黏结性能试验研究

发布时间：2018-08-25 12:31

【摘要】：通过51个钢-聚丙烯混杂纤维混凝土试件的中心拉拔试验,研究钢-聚丙烯混杂纤维混凝土与变形钢筋的黏结性能,分析钢纤维体积率、钢纤维长径比、聚丙烯纤维体积率和混凝土强度对黏结性能的影响,建立黏结本构关系。结果表明:对极限黏结强度的影响排序为,混凝土强度最大,钢纤维的体积率和长径比次之,聚丙烯纤维体积率最小;随着钢纤维体积率、钢纤维长径比和混凝土强度的增大,极限黏结强度分别提高18.4%、17.4%和50.5%,峰值滑移分别提高39%、38%和31%,聚丙烯纤维体积率的变化对极限黏结强度和峰值滑移没有明显影响;与钢纤维混凝土、聚丙烯纤维混凝土和普通混凝土相比,极限黏结强度相应提高5.3%、21.3%和18.2%,峰值滑移相应提高2.8%、36%和90%。提出黏结应力-滑移全曲线的数学表达式,可为钢-聚丙烯混杂纤维混凝土的工程应用和《纤维混凝土结构技术规程》的修订提供参考。
[Abstract]:Based on the central drawing test of 51 specimens of steel-polypropylene hybrid fiber concrete, the adhesion properties of steel polypropylene hybrid fiber concrete and deformed steel bar were studied. The volume ratio of steel fiber and the ratio of length to diameter of steel fiber were analyzed. The effect of the volume ratio of polypropylene fiber and the strength of concrete on the bond properties was established. The results show that the order of influence on the ultimate bonding strength is that the concrete strength is the largest, the volume ratio of steel fiber and aspect ratio is the second, the volume ratio of polypropylene fiber is the smallest, and the ratio of length to diameter of steel fiber and the strength of concrete increase with the increase of steel fiber volume ratio. The ultimate bond strength was increased by 18.4% and 50.5%, and the peak slip was increased by 39% and 31%, respectively. The volume ratio of polypropylene fiber had no significant effect on the ultimate bond strength and peak slip. Compared with ordinary concrete, the ultimate bond strength of polypropylene fiber concrete is increased by 5.3% and 18.2%, and the peak slip is increased by 2.8% and 90% respectively. The mathematical expression of the whole curve of bond stress-slip is put forward, which can provide a reference for the engineering application of steel-polypropylene hybrid fiber reinforced concrete and the revision of Technical Specification for Fiber reinforced concrete structures.
【作者单位】：武汉大学;
【基金】：国家自然科学基金(51278388)
【分类号】：TU528

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