摘要
本文搜集了大量关于各种混杂纤维混凝土(包括普通混杂纤维混凝土,层布式混杂纤维混凝土和不同几何尺寸的混杂纤维混凝土)的文献,概述了国内外混杂纤维混凝土的研究现状。本文应用大连理工大学唐春安教授具有自主版权的用于材料破坏全过程分析的软件系统RFPA2D进行混杂纤维混凝土受弯性能的研究。基于对材料细观结构的认识,假定混杂纤维混凝土是有纤维和混凝土组成的二相复合材料(混凝土界面是理想界面)。为了考虑各项组分的非均匀性,各组分的材料性质按照给定的Weibull分布来赋值,细观单元满足弹性损伤的本构关系,建立二维的混杂纤维混凝土模型。通过改变混杂纤维在混凝土中的掺量、布置方式、长度来分析混杂纤维混凝土在破坏过程中裂纹扩展的规律,裂纹的最终形态,荷载-位移曲线图的走势,声发射的分布规律,弯曲韧性和抗弯强度的变化,研究其增强机理。主要研究内容如下:
(1)建立不同掺量的钢-聚丙烯纤维混凝土和碳-钢纤维混凝土的数值模型,通过钢-聚丙烯纤维混凝土和碳-钢纤维混凝土在三点弯曲下的数值模拟试验,探讨了不同纤维类型及不同掺量对混凝土弯曲强度及变形性能的影响,并将数值模拟结果与现有文献中的物理试验结果进行对比分析研究,进而得到一些有意义的结论。
(2)建立层布式混杂纤维混凝土(即在上下20cm布置钢纤维,在中间部位布置聚丙烯纤维)的数值模型,得到层布式混杂纤维混凝土裂纹由萌生、扩展、贯通直至失稳的全过程模拟,得出在纤维用量相等的情况下,层布式纤维混凝土能更好的提高试件的强度和韧性。
(3)建立不同几何尺寸的混杂纤维混凝土的数值模型,研究长短比例对试件的峰值强度、弯曲韧性、应变能等的影响。得出当长、短纤维的比例在2:1～1:1之间时,混杂性能最佳。
Large amount of literatures about hybrid fiber concrete (including ordinary hybrid fiber concrete, layered hybrid fiber concrete and different geometric dimension of hybrid fiber concrete) have been collected and reviewed in this paper. research situation of hybrid fiber concrete were then be understood. In this paper, by using numerical analysis software RFPA2D (Realistic Failure Process Analysis) owned by Professor Tang Chunan in Dalian University of Technology to simulate the flexural performance of the hybrid fiber concrete. Based on the existing knowledge of mesoscopic structure of concrete material, t hybrid fiber concrete is assumped to be a two-phase composite material composed of fiber and concrete (the interface is assumed to be an ideal one). In order to consider inhomogeneity of material properties, various components are assigned according to the given Weibull distribution. Elastic damage constitutive relationship could be satisfied within mesoscopic element.Hence, two-dimensional hybrid fiber concrete model could be established. By changing fiber’s content, layouts, length in concret, the law of crack growth in the failure process, the final crack patterns, the trend of the load-displacement curve, temporal and spatial distribution of acoustic emission, bending toughness and bending strength, have been analyzed to reveal the failure law and the strengthening mechanism of hybrid fiber concrete. The major contents are listed as following:
(1) Establish the numerical models with different incorporation ratios of steel-polypropylene fiber reinforced concrete and carbon–steel fiber reinforced concrete.Through numerical tests of different incorporation ratios, the influence of the different fiber type and the different dosage on concrete bending strength and deformation properties were discussed. By comparing the numerical results and existing experimental results in reviewed liteature,and some significant conclusions can be drawn.
(2) Establish the numerical model of layered hybrid fiber reinforced concrete (decorate steel fiber about 20cm , decorate polypropylene fiber in intermediate place). The numerical simulation of whole processes of crack initiation, growth, running through to finally unstable have been obtained for layered hybrid fiber reinforced concrete. with same fiber dosage, the layered hybrid fiber reinforced concrete can improve the strength and toughness better than the other.
(3) Establish numerical models ofhybrid fiber reinforced concrete with different geometric sized. The influence of length/short proportion on specimen peak load, flexural toughness, strain etc. have been studied. Conclusions can drawn that when long, short fibers are in the proportion between 2:1 ~ 1:1, performance of hybrid fiber is the best.
引文
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