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为了研究纤维沥青混凝土的本构模型,将其视为以沥青混合料为粘弹性基体,纤维为弹性夹杂的两相复合材料。对基于复合材料细观力学理论建立的有效模量表达式进行了修正,提出了纤维沥青混凝土的割线有效松弛模量。以聚酯纤维沥青混凝土为例进行了有效松弛模量的解析分析和模拟蠕变实验的有限元分析,分析结果与试验数据的比较表明,该文提出的割线有效松弛模量模型对于纤维沥青混凝土粘弹性力学行为具有很好的预测能力。应用该模型对路面弯沉变形进行了有限元分析,结果表明:纤维的加入有效的改善了沥青混凝土路面的粘弹性性能。
In order to study the constitutive model of fiber asphalt concrete, it is considered as a two-phase composite material with elastic mixture of asphalt mixture as viscoelastic matrix. The effective modulus expressions established based on the theory of micromechanics of composite materials are modified and the effective secant secant modulus of fiber asphalt concrete is proposed. Taking the polyester fiber asphalt concrete as an example, the effective slack modulus analysis and the simulation creep experiment are analyzed. The comparison between the experimental results and the experimental results shows that the effective secant modulus of the secant proposed in this paper is better than that of the fiber asphalt The viscoelastic behavior of concrete has good predictive ability. The finite element analysis of the road surface deformation is carried out by using this model. The results show that the addition of fibers can effectively improve the viscoelasticity of asphalt pavement.