钢纤维在混凝土冲击断面的分布与统计分析

发布时间：2018-01-11 05:08

本文关键词：钢纤维在混凝土冲击断面的分布与统计分析　出处：《硅酸盐通报》2017年11期 　论文类型：期刊论文

【摘要】：采用自制落锤冲击试验装置,对5组钢纤维体积掺量分别为0、0.5%、0.8%、1.0%、1.2%的钢纤维混凝土圆饼状试件进行了冲击试验。通过统计冲击断面上纤维根数,对纤维分散系数进行了计算和拟合;基于威布尔分布,对冲击试验结果进行了统计分析,建立了不同失效概率下冲击次数与纤维掺量间的关系。结果表明:掺入钢纤维可以显著提高混凝土抗冲击性能;纤维分散系数随掺量的增大呈上升趋势,双参数的威布尔分布可以较好地对冲击性能进行统计分析。
[Abstract]:The volume content of 5 groups of steel fibers was 0 0. 5% and 0. 8%, respectively, by using a drop hammer impact test device, and the volume content of 5 groups of steel fibers was 1.0%. The impact test was carried out on 1.2% steel fiber reinforced concrete round cake specimens. The fiber dispersion coefficient was calculated and fitted by counting the number of fiber roots on the impact section. Based on Weibull distribution, the impact test results are statistically analyzed. The relationship between the number of impact and fiber content under different failure probability is established. The results show that the impact resistance of concrete can be improved significantly by adding steel fiber. The fiber dispersion coefficient increases with the increase of the content of fiber, and the Weibull distribution with two parameters can be used to analyze the impact performance.
【作者单位】：燕山大学建筑工程与力学学院;
【基金】：国家自然科学基金(51608469,51578477) 河北省研究生创新能力培养资助项目(CXZZSS2017054)
【分类号】：TU528.572
【正文快照】： 1引言钢纤维混凝土(Steel Fiber Reinforced Concrete,简称SFRC)是在普通混凝土中掺入钢纤维而得到的新型复合材料[1]。由于钢纤维在混凝土基体中随机乱向分布,故掺加钢纤维是提高水泥基复合材料抗拉强度、抗折强度的最有效方法之一。混凝土基体在承受冲击荷载作用下开裂,钢纤

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