混杂纤维混凝土弯曲韧性评价体系

发布时间：2018-04-16 20:28

本文选题：混杂纤维混凝土 + 韧性指数　；参考：《土木工程与管理学报》2017年02期

【摘要】：根据纤维总体积掺量为1%的混杂纤维混凝土四点弯曲试验和切口梁弯曲试验的荷载挠度曲线、韧性指数I_n和纤维混凝土能量吸收值D_n等计算指标,结合试验力学模型以及弯曲韧性评价指标的含义,对两种试验方法下荷载挠度曲线的精密度进行方差分析;对混杂纤维混凝土的韧性指数I_n、纤维混凝土能量吸收值D_n的离散程度进行统计分析。研究表明:对于低掺量混杂纤维混凝土而言,四点弯曲试验与切口梁弯曲试验的荷载挠度曲线的精密度一致;采用纤维混凝土能量吸收值D_n作为弯曲韧性评价指标,其离散程度较小,所需要的试件数量较少,通过等效抗弯拉强度f_(eq1)、f_(eq2)可以建立弯曲韧性指标与强度指标之间的联系;选用切口梁法的试验方式和纤维混凝土能量吸收值D_n更适宜于低掺量混杂纤维混凝土弯曲韧性研究,有利于以韧性为基础的结构设计方法的发展。
[Abstract]:According to the load-deflection curve of Four-point bending test and notch beam bending test of hybrid fiber concrete with 1% fiber total volume, the toughness index I _ n and energy absorption value D _ n of fiber concrete are calculated.Combined with the meaning of test mechanics model and flexural toughness evaluation index, the precision of load deflection curve under two test methods was analyzed by variance analysis.The dispersion of the toughness index of hybrid fiber reinforced concrete (I _ S) and the energy absorption value of fiber reinforced concrete (D _ S _ n) is analyzed statistically.The results show that for low content hybrid fiber reinforced concrete, the precision of load deflection curve of four-point bending test is consistent with that of notch beam bending test, and the energy absorption value Dn of fiber reinforced concrete is used as the evaluation index of flexural toughness.The degree of dispersion is smaller and the number of specimens needed is less. The relationship between flexural toughness index and strength index can be established by equivalent flexural tensile strength f / e Q1 / F / T / e / Q _ 2).The method of notch beam test and the energy absorption value of fiber reinforced concrete D _ n are more suitable for the study of flexural toughness of low-volume hybrid fiber reinforced concrete, which is propitious to the development of structural design method based on toughness.
【作者单位】：湖北工业大学土木建筑与环境学院;
【基金】：国家自然科学基金(51108164)
【分类号】：TU528.572

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