中文摘要：

沥青混合料的抗拉性能是表征其低温与疲劳性能的重要指标。本文针对半圆弯曲试验（SCB）与劈裂试验（IDT）建立三维非线性有限元模型，对两种试验方法的受力特点与破坏模式进行数值模拟，并利用室内试验进行验证。结果表明：两试验中试件的力学响应规律明显不同；半圆弯曲试验试件主要承受拉应力，劈裂试验试件内出现压缩、拉伸、剪切多种受力模式交织现象；非轴对称受力时，劈裂试件的应力响应更为复杂，不能充分体现间接拉伸的目的。相比较而言，半圆弯曲试验更能模拟沥青混凝土路面的层底受拉状况。

英文摘要：

The tensile property of asphalt mixtures displays the low temperature and fatigue performance. To research the the mechanical responses and failure modes, three-dimensional nonlinear models are set up for the indirect tensile （IDT） specimen and the semi-circular bending （SCB） specimen, and the numerical analysis results are confirmed by laboratory tests. The results show that the mechanical response of IDT specimen is different from that of SCB; the dominant stress state in the SCB test is tensile stress, but the IDT specimen display a complicated stress state including compression stress, tensile stress and shear stress ; in dissymmetrical state, there is a mixed stress state in IDT specimen, it may not getting tensile damage; the SCB test is better than IDT test in simulating the mechanical response of pavement.