正交异性钢桥面板典型节点热点应力分析

发布时间：2020-12-11 17:21

　　由桥面板,纵肋和横梁组成的正交异性钢桥面板,由于其特有的特性,引起了许多桥梁工程师,非常轻。正交异性钢甲板的金属结构特别适用于重量是设计的关键参数,如大型和非常大的甲板或活动跨度。然而,交通繁忙的增加,因为桥面被车轮荷载直接加载,并且由于焊接引起的残余应力的结果倾向于使正交异性甲板疲劳行为成为更为关键的问题。因此,深入研究正交异性钢桥面板的疲劳裂缝是至关重要的。在这些疲劳裂纹中,在肋对甲(RD)接头周围出现裂纹,而纵桁对甲板(SD)是最关键的,因为接头疲劳裂纹会导致顶面损坏。本研究的目的是研究SD和RD接头的热点应力。主要研究内容如下:(1)采用实体单元和壳单元构建正交异性钢甲板结构的有限元模型并进行分析。总的来说,本文研究了整个桥梁结构的两种焊接连接方式:纵梁到甲板(SD)和肋骨到甲板(RD)。这些连接是可能发生疲劳的区域。(2)共10个试件,包括4个SD接头和6个RD接头。中心和偏心负载被认为是静态负载的一部分。通过外推法测量焊趾附近的应力,得到焊趾热点应力。(3)根据实验测试结果和有限元分析结果,比较了解得更好,并对两种结果的关系进行了研究。在80%焊缝渗透到U形肋中时,甲板的表... 

【文章来源】：上海交通大学上海市 211工程院校 985工程院校 教育部直属院校

【文章页数】：82 页

【学位级别】：硕士

【文章目录】：
ABSTRACT
摘要
Chapter 1 Introduction
    1.1 Orthotropic steel deck:Generalities
    1.2 Definition
    1.3 Evolution of the concept
    1.4 The research content
Chapter 2 Fatigue assessment in orthotropic steel bridge decks
    2.1 Orthotropic steel bridge deck types and their behavior
    2.2 Analytical calculation methods
        2.2.1 Local effort calculation method
    2.3 Finite element calculation methods
    2.4 Research status
    2.5 Fatigue in orthotropic steel bridge deck
        2.5.1 Hot spot stress method
Chapter 3 Experimental study on orthotropic steel bridge decks
    3.1 Test purpose
    3.2 Test design
        3.2.1 Specimen design
    3.3 Boundary conditions and load conditions
        3.3.1 Boundary conditions
        3.3.2 Loading conditions
    3.4 Mechanical properties of specimen
    3.5 Test loading
        3.5.1 Test equipment
        3.5.2 Test loading scheme
    3.6 Test measurement
        3.6.1 Static load
    3.7 Chapter summary
Chapter 4 Finite element analysis on orthotropic steel bridge decks
    4.1 Introduction
    4.2 ABAQUS
    4.3 Model description and configuration
        4.3.1 Boundary conditions
        4.3.2 Mesh
        4.3.3 Load conditions
        4.3.4 Finite element results
    4.4 Finite element analysis of nodes
        4.4.1 Geometric size and boundary condition of the model
        4.4.2 Load conditions
        4.4.3 Unit selection and model establishment
        4.4.4 Analysis of the results of comparison
    4.5 Chapter summary
Chapter 5 Hot spot stress results of orthotropic steel bridge decks
    5.1 Hot spot stress results on SD connection
        5.1.1 Hot spot stress analysis
        5.1.2 Comparison of finite element hot spot stress results
    5.2 Hot spot stress results on RD connection
        5.2.1 Hot spot stress analysis
        5.2.2 Comparison of hot spot stress results with finite element
        5.2.3 Influence of thickness change in RD node
    5.3 Chapter summary
Chapter 6 Conclusion and prospects
    6.1 Conclusion
    6.2 Aspects proposed for further study
References
Acknowledgement
Published papers



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