基于损伤断裂力学的钢桥面铺装体系疲劳特性研究.pdfVIP

基于损伤-断裂力学的钢桥面铺装体系疲劳特性研究 徐勋倩, 金江 (南通大学建工学院 江苏 南通 226007) 摘 要：钢桥面铺装体系主要是由钢板与沥青混合料组成，由于钢材的优良性能，在周期行车载荷作用下，疲劳损伤、疲劳裂缝的形成和扩 展主要产生在沥青混合料铺装层内，因此沥青混合料的疲劳损伤开裂已成为桥面铺装层破坏的主要灾害之一。文章基于损伤－断裂力学的方 法就沥青混合料在循环荷载作用下的力学行为和疲劳损伤特性进行分析，同时探索钢桥面沥青混合料铺装体系复合结构应力场、应变场、损 伤场及疲劳寿命的理论预测方法。最后，通过南京长江第二大桥钢桥面铺装体系疲劳实例分析验证预测方法的合理性，并与其它预测方法的 结果进行比较。 关键词：损伤-断裂力学；钢桥面；铺装体系；疲劳特性 中图分类号：443.33 文献标识码：A Research on Fatigue Characteristic of Steel Bridges Deck Pavement by the Method of Damage-Fracture Mechanics XU Xunqian ，Jin Jiang （Architecture Department of Nantong University,Jiang su,Nantong 226007,China) Abstract: Steel bridges deck pavement were made of steel and asphalt mixture surfacing. As the excellent performance of steel, under repeated wheel load, the fatigue damage and crack formed and developed mainly in the asphalt mixture deck pavement. Therefore, fatigue damage and crack of asphalt mixture deck pavement became the primary disaster of steel bridges deck pavement’s breakage. Basing on the method of damage-fracture mechanics, the mechanical behavior and fatigue fracture characteristic of asphalt mixture surfacing under repeated load was analyzed. At the same time, the stress 、 strain and fracture distribution of steel bridges deck asphalt mixture surfacing composite structure was explored, and its pre-evaluating formula of fatigue life was proposed. Finally, comparing with other methods, a example, the steel bridges deck pavement of Nanjing Second Yangtze River Bridge, was provided to test the rationalities of the pre-evaluating formula. Keyword: Damage-Fracture Mechanics; Steel Bridges; Deck Pavement；Fatigue Characteristic 铺