土木与环境工程学报（中英文）2025，Vol.47Issue(3)：180-189,10.DOI:10.11835/j.issn.2096-6717.2023.035
钢桥面板疲劳裂纹全寿命周期扩展特性
Fatigue crack life cycle growth characteristics of steel bridge deck
摘要
Abstract
The initial welding defect is the key factor that affects the fatigue performance of the structural details of the orthotropic steel bridge deck.In order to study the whole life cycle dynamic characteristics of crack initiation and propagation of the joint weld between the top plate and the longitudinal rib of the orthotropic steel bridge deck,based on the fracture mechanics theory and ABAQUS-FRANC3D interactive technology,the dynamic characteristics of the stress intensity factor in the whole process from the weld buried defect to the fatigue fracture were studied,the crack shape development law was revealed,and the influence of sensitive parameters on the crack growth rate and fatigue life was analyzed,the full-life propagation behaviour of fatigue crack is clarified,and the reliability of the research results is verified by the full-scale segmental fatigue test of steel bridge deck.The analysis results show that the fatigue crack growth behavior of steel bridge deck can be divided into three stages:burial stage,initiation stage,and propagation stage.The distribution of stress intensity factors in the buried initiation stage and the propagation stage along different crack paths are exactly opposite;buried cracks of any initial shape tend to be round with continuous expansion,and surface cracks of any shape gradually flatten,which reasonably explains the flat shape of surface cracks when they continue to extend to the roof;the crack propagation rate along the upper surface of the buried stage is 54%higher than that along the lower surface.The crack propagation rate from the buried initiation stage to the roof direction is larger;The crack shape ratio and the burial depth have a great influence on the initiation life,and the initiation life accounts for the majority of the total fatigue life.关键词
钢桥面板/疲劳裂纹/疲劳寿命/应力强度因子/埋藏裂纹Key words
steel bridge deck/fatigue crack/fatigue life/stress intensity factor/embedded crack分类
交通工程引用本文复制引用
鲁乃唯,崔健,罗媛,王鸿浩..钢桥面板疲劳裂纹全寿命周期扩展特性[J].土木与环境工程学报（中英文）,2025,47(3):180-189,10.基金项目
国家重点研发计划(2021YFB2600900) （2021YFB2600900）
国家自然科学基金(51908068、52178108) （51908068、52178108）
湖南省自然科学基金(2021JJ30720) （2021JJ30720）
长沙理工大学专业学位研究生"实践创新与创业能力提升计划"(SJCX202121) National Key Research and Development Plan Project(No.2021YFB2600900) （SJCX202121）
National Natural Science Foundation of China(Nos.51908068,52178108) （Nos.51908068,52178108）
Hunan Natural Science Foundation Project(No.2021JJ30720) （No.2021JJ30720）
"Practice Innovation and Entrepreneurship Improvement Plan"for Professional Degree Postgraduates of Changsha University of Technology(No.SJCX202121) （No.SJCX202121）
