沥青混凝土小梁断裂试验有限元模拟

Finite Element Modeling of Cracking Test of Asphalt Concrete Beam

文章使用内聚力模型模拟了沥青混凝土的小梁断裂试验,分析了试验过程中梁中间截面上的法向拉应力的分布、损伤规律和裂缝的形成与扩展情况。研究结果表明:在小梁断裂试验中,梁中间截面上法向拉应力在梁底端最大,向梁顶端逐渐减小;梁中间截面上损伤区域的损伤值随着荷载的增加而增加,并且损伤深度也逐渐增加;梁中间截面底端的损伤值达到1时,梁底端就会产生裂缝,而后裂缝向梁顶端扩展,扩展速率逐渐减小。

The cohesive zone model is used to simulate the cracking test of asphalt concrete beam. The normal stress distribution, damage and the crack initiation and propagation on the middle section of the beam during the test is analyzed. The study indicates that the normal stress is biggest in the bottom and decrease towards the top on the middle section of the beam during the test. The damage value in the damaged zone on the middle section of the beam increases as the load increases and the depth of the damaged zone also increases.When the damage value in the damaged zone increases to 1, the crack appears in the bottom of the beam and then the crack extends to the top with the growth rate decreasing gradually.