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应用复合材料细观力学理论,并结合四单元五参数模型对纤维增强沥青混凝土的粘弹性本构模型进行了探讨。利用拉普拉斯变换及其逆变换,实现了四单元五参数粘弹性模型的从蠕变模型向松弛模型的转换,得出纤维沥青混凝土有效劲度模量的粘弹性公式,并应用该公式分析了纤维掺量与纤维沥青混凝土松弛模量之间的关系。通过将几种不同纤维掺量情况下的计算结果与实验拟合数据结果进行比较,证明在纤维重量掺量小于0.20%时,理论公式的计算结果与试验拟合数据结果取得较好的一致性。
The viscoelastic constitutive model of fiber reinforced asphalt concrete is discussed with the theory of meso mechanics of composite materials and the four-unit five-parameter model. The transformation from creep model to relaxation model of four-element five-parameter viscoelastic model was realized by using Laplace transform and its inverse transform. The viscoelastic formula of effective stiffness modulus of fiber asphalt concrete was obtained and the formula The relationship between fiber content and relaxation modulus of fiber asphalt concrete was analyzed. By comparing the calculated results with the experimental data, the results show that the calculated results of the theoretical formula are in good agreement with the experimental data when the fiber weight content is less than 0.20% .