纤维沥青混凝土五单元八参数粘弹性力学模型

发布时间：2018-02-21 04:48

本文关键词： 道路工程纤维沥青混凝土蠕变试验粘弹性能力学模型纤维含量特征参数　出处：《中国公路学报》2014年02期 　论文类型：期刊论文

【摘要】：为了准确描述纤维沥青混凝土的粘弹性变形性能,在分析其蠕变全过程变形特征和常用粘弹性模型的基础上,提出了纤维沥青混凝土五单元八参数粘弹性力学模型。通过不同纤维体积率和长径比的纤维沥青混凝土小梁弯曲蠕变试验,求解模型参数,研究纤维体积率和长径比对模型参数及沥青混凝土粘弹性能的影响,建立了五单元八参数模型表征的考虑纤维含量特征参数影响的纤维沥青混凝土粘弹性本构方程,并进行了粘弹性分析。研究结果表明:五单元八参数模型能表征纤维沥青混凝土蠕变全过程的粘弹性变形特征,与蠕变试验结果具有较好的相关性;纤维含量特征参数能综合反映纤维体积率和长径比对沥青混凝土粘弹性能的影响,在所研究的试验范围内,纤维沥青混凝土最佳纤维体积率为0.348%,长径比为324,纤维含量特征参数为1.128。
[Abstract]:In order to accurately describe the viscoelastic deformation properties of fiber reinforced asphalt concrete, the deformation characteristics of fiber asphalt concrete during creep and the viscoelastic models are analyzed. The viscoelastic mechanics model of fiber-asphalt concrete with five elements and eight parameters is proposed. The model parameters are solved by the bending creep test of fiber asphalt concrete trabeculae with different fiber volume ratio and aspect ratio. The effects of fiber volume ratio and aspect ratio on the model parameters and viscoelastic properties of asphalt concrete were studied. The viscoelastic constitutive equation of fiber asphalt concrete was established, which was characterized by five element eight parameter model and considering the influence of fiber content characteristic parameters. The results show that the model of five elements and eight parameters can characterize the viscoelastic deformation characteristics of fiber asphalt concrete during creep, and has a good correlation with the creep test results. The fiber content characteristic parameters can reflect the influence of fiber volume ratio and aspect ratio on viscoelastic properties of asphalt concrete. The optimum fiber volume ratio of fiber asphalt concrete is 0.348, the aspect ratio is 324, and the characteristic parameter of fiber content is 1.128.
【作者单位】：郑州大学水利与环境工程学院;
【基金】：国家自然科学基金项目(50678159)
【分类号】：U414

【参考文献】