钢纤维混凝土弯曲韧性试验及有限元分析

发布时间：2018-02-24 05:16

本文关键词： 钢纤维混凝土新型高强钢纤维弯曲韧性切口梁等效弯拉强度残余弯拉强度有限元分析　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：韧性是钢纤维混凝土力学性能的重要指标,可用钢纤维混凝土材料或者结构从受荷到破坏的耗能来衡量,目前常采用弯曲韧性作为衡量钢纤维混凝土韧性的主要指标。本文将连续端钩钢纤维加入混凝土,通过试验研究和有限元分析,重点研究连续端钩钢纤维混凝土的弯曲韧性。主要研究内容如下:1.通过150×150×550mm切口梁试件的三点弯曲试验,获得钢纤维混凝土切口梁的荷载-挠度曲线,采用国际材料与结构研究实验联合会推荐的弯曲韧性评价方法RILEMTC 162-TDF计算弯曲韧性指标,并进一步探讨钢纤维体积率、钢纤维类型、基体混凝土强度和切口深度对钢纤维混凝土梁荷载-挠度曲线和弯曲韧性的影响。2.根据试验结果,将RILEMTC 162-TDF弯曲韧性评价方法计算得到的等效弯拉强度f_(eq,2)和f_(eq,3)和残余弯拉强度F_(R,1)、F_(R,2)、F_(R,3)和F_(R,4)进行对比分析,结果表明,等效弯拉强度和残余弯拉强度具有较高的线性相关性。将等效弯拉强度f_(eq,2)、f_(eq,3)与钢纤维混凝土劈拉强度、抗压强度、切口深度和钢纤维体积率进行多元拟合,建立相应的计算模型,得到钢纤维等效弯拉强度特征参数。3.采用有限元软件ABAQUS进行钢纤维混凝土切口梁的数值模拟,获得切口梁的荷载-挠度曲线,并与试验曲线对比,验证模型的合理性。
[Abstract]:Toughness is an important index of the mechanical properties of steel fiber reinforced concrete (SFRC), which can be measured by the energy consumption of steel fiber reinforced concrete (SFRC) materials or structures from load to failure. At present, flexural toughness is often used as the main index to measure the toughness of steel fiber reinforced concrete. In this paper, continuous end hook steel fiber is added to concrete. The flexural toughness of steel fiber reinforced concrete (SFRC) with continuous end hook is studied emphatically. The main contents are as follows: 1. The load-deflection curve of SFRC notched beam is obtained by three-point bending test of 150 脳 150 脳 550mm notch beam. The flexural toughness index is calculated by RILEMTC 162-TDF, which is recommended by the International Federation of Materials and structure Research experiments, and the volume ratio of steel fiber and the type of steel fiber are further discussed. Effects of strength and notch depth of matrix concrete on load-deflection curve and flexural toughness of steel fiber reinforced concrete beams. The equivalent flexural strength of RILEMTC 162-TDF calculated by means of the flexural toughness evaluation method (flife / eqt2) and the residual flexural tensile strength (FSP) and the residual flexural strength (FSP) and the residual flexural strength are compared and analyzed, and the results show that, The equivalent flexural tensile strength and the residual flexural tensile strength have a high linear correlation. The characteristic parameter of equivalent flexural tensile strength of steel fiber is obtained. The numerical simulation of steel fiber reinforced concrete notch beam is carried out by using finite element software ABAQUS. The load-deflection curve of the notch beam is obtained and compared with the experimental curve to verify the rationality of the model.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528.572

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