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用损伤力学原理及方法,从力学近似法角度分析了环境温度和循环车辆荷载共同作用下钢桥面沥青混合料铺装的疲劳损伤特性,推导出疲劳试验复合梁的损伤场、应力和应变场。以长江一大桥钢桥面环氧沥青混凝土铺装体系复合梁疲劳试验为例,进一步推导出复合梁的疲劳寿命预测公式。实例分析表明,考虑环境温度和车辆荷载共同作用下钢桥面铺装体系的疲劳寿命要小于单一考虑行车荷载的计算结果,二者相差最大可达44%。研究认为温度变化会导致铺装层的劲度不断发生变化,从而直接影响钢桥面沥青混合料铺装的力学行为和疲劳寿命,因此仅考虑交通荷载的作用进行钢桥面沥青混合料铺装体系疲劳损伤的分析是过于简化的,应予以重视。此外,指出了环氧沥青混凝土铺装具有很好的抗疲劳性能。
Using the damage mechanics principle and method, the fatigue damage characteristics of pavement with asphalt mixture under the action of ambient temperature and circulating vehicle load are analyzed from the perspective of mechanical approximation. The damage, stress and strain fields of fatigue test composite beam are deduced . Taking the fatigue test of the composite bridge of the steel bridge deck epoxy asphalt concrete pavement of the Changjiang River Bridge as an example, the prediction formula of the fatigue life of the composite beam is deduced further. The case study shows that the fatigue life of the steel bridge deck pavement system is less than the one considering the driving load considering the combination of ambient temperature and vehicle load. The difference between the two is 44%. The study shows that the temperature changes will cause the stiffness of the pavement to change constantly, which will directly affect the mechanical behavior and fatigue life of asphalt pavement pavement. Therefore, considering the traffic load, the asphalt pavement pavement Analysis of fatigue damage system is too simplistic, should be taken seriously. In addition, it is pointed out that the epoxy asphalt pavement has good anti-fatigue properties.