沥青混合料热粘弹性本构关系试验测定及其力学应用-工程力学.PDFVIP

第 25 卷第 1 期 Vol.25 No. 1 工 程 力 学 2008 年 1 月 Jan. 2008 ENGINEERING MECHANICS 34 文章编号：1000-4750(2008)01-0034-08 沥青混合料热粘弹性本构关系试验测定 及其力学应用 * 郑健龙， 钱国平，应荣华 (长沙理工大学公路工程学院，长沙 410076) 摘 要：基于热粘弹性力学理论，就不同的温度条件下沥青混合料的应力松弛特征开展了试验研究，应用热流变 简单材料的时温等效原理对试验结果进行了分析和参数拟合，根据试验结果建立了描述沥青混合料粘弹特性的广 义 Maxwell 模型；通过理论推导提出了沥青混合料非定常和非均匀变温条件下增量型热粘弹性本构关系，在此基 础上，给出应用本构关系进行沥青路面热粘弹性力学分析的数值实现方法；通过对 TSRST 试验的模拟，对得到 的沥青混合料热粘弹性本构关系及其数值实现方法的合理性进行了验证，并给出一个工程计算实例。 关键词：沥青混合料；热粘弹理论；本构关系；应力松弛试验；温度应力；有限元法 中图分类号：U416; O343.6; TB322 文献标识码：A TESTING THERMALVISCOELASTIC CONSTITUTIVE RELATION OF ASPHALT MIXTURES AND ITS MECHANICAL APPLICATIONS * ZHENG Jian-long , QIAN Guo-ping , YING Rong-hua (School of Highway Engineering, Changsha University of Science and Technology, Changsha 410076, China) Abstract: Taking thermalviscoelasticity theory as a guide, the stress relaxation test of asphalt mixtures is studied in different temperature environment. The test data are analyzed and the interrelated model parameters are fitted by use of the time-temperature equivalence principle of the thermo-rheologically simple materials. Based on the test results, a generalized Maxwell model is established to simulate the viscoelastic property of asphalt mixtures. And the incremental thermalviscoelastic constitutive relation under nonconstant, nonuniform temperature conditions is obtained from theoretical derivation. Furthermore, a numerical method for thermalviscoelastic analysis of asphalt pavement is provided by using the incremental constitutive relation. At las