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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。
In order to accurately describe the viscoelastic deformation performance of fiber asphalt concrete, the five-element viscoelastic mechanical model of fiber asphalt concrete is proposed based on the analysis of the whole creep deformation process and the commonly used viscoelastic model. The flexural creep tests of fiber reinforced asphalt concrete beams with different fiber volume fraction and aspect ratio were used to solve the model parameters. The effects of fiber volume fraction and aspect ratio on the model parameters and the viscoelastic properties of asphalt concrete were studied. The model is characterized by the viscoelastic constitutive equation that takes into account the fiber content characteristics parameters of the viscoelasticity of fiber-reinforced concrete, and the viscoelasticity analysis is carried out. The results show that the five-element eight-parameter model can characterize the viscoelastic deformation of the whole process of fiber asphalt concrete creep and has good correlation with the creep test results. The fiber content characteristic parameters can comprehensively reflect the fiber volume fraction and aspect ratio On the viscoelastic properties of asphalt concrete, the optimum fiber volume fraction of fiber asphalt concrete is 0.348%, the aspect ratio is 324 and the fiber content characteristic parameter is 1.128 in the experimental range studied.