基于剪切疲劳破坏的钢桥面双层SMA铺装寿命预估分析  

Prediction Analysis of Service Life of Steel Deck with Double SMA Pavement Based on Shear Fatigue Failure

作　　者：许鹰 黎文杰[1] 李新舟 夏立翔 丑志静 Xu Ying;Li Wenjie;Li Xinzhou;Xia Lixiang;Chou Zhijing(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architechture,Beijing 100044,China;Beijing Urban Transportation Infrastructure Engineering Technology Research Center,Beijing University of Civil Engineering and Architechture,Beijing 100044,China;Beijing General Municipal Engineering Design&Research Institute Co.,Ltd.,Beijing 100082,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京建筑大学北京市城市交通基础设施建设工程技术研究中心,北京100044 [3]北京市市政工程设计研究总院有限公司,北京100082

出　　处：《市政技术》2023年第2期1-8,共8页Journal of Municipal Technology

基　　金：国家自然科学基金-多源耦合作用下单组分聚氨酯-集料界面黏附损伤机理研究(52278425);国家自然科学基金-沥青对3DOMTiO2降解氮氧化物行为的扰动机制研究(51978035)。

摘　　要：为探究钢桥面铺装结构中决定其使用寿命的主要病害和关键设计指标,以武汉白沙洲大桥为分析对象,考虑车辙、铺装层底的弯曲疲劳破坏以及防水粘结层的剪切疲劳破坏3种病害形式,针对性地选择和建立车辙深度、弯曲疲劳寿命和剪切疲劳寿命预估模型,结合铺装结构在-10~70℃范围内的有限元力学分析结果,以及白沙洲大桥实际的温度分布和交通量状况,计算分析了白沙洲大桥钢桥面铺装结构3种病害的发展演化规律。结果表明,决定白沙洲大桥使用寿命的主要病害形式为防水粘结层的剪切疲劳破坏。规范中以抗剪强度作为防水粘结层的抗剪性能控制指标在本案例中并不合理,建议将层间剪切疲劳作为关键性指标纳入设计指标体系。对于已建成桥梁,可采取增加铺装层厚度和控制交通量的方式延长铺装结构的使用寿命。In order to explore the main diseases and key design indicators that determine the service life of steel deck pavement structures, Wuhan Baishazhou Bridge is taken as the analyzed object. Considering three disease forms of rutting, bending fatigue damage at the bottom of pavement layer and shear fatigue damage of waterproof adhesive layer, the prediction models of rutting depth, bending fatigue life and shear fatigue life are selected and established pertinently. Combined with the finite element mechanical analysis results of pavement structure in the range of-10~70 ℃, as well as the actual temperature distribution and traffic volume of Baishazhou Bridge, the evolution law of three diseases of the steel deck pavement structure are calculated and analyzed. The results show that the main disease that determines the service life is the shear fatigue failure of the waterproof adhesive layer. In this case, it is not reasonable to use shear strength as the shear performance control index of waterproof adhesive layer in the specification. The interlaminar shear fatigue is suggested to be the key index in the design index system. For completed bridges, the service life of the pavement structure can be extended by increasing the thickness of the pavement layer and controlling the traffic volume.

关 键 词：钢桥面铺装 病害 有限元分析 疲劳寿命预估 结构优化 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]