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Experimental Investigation on Fatigue Behavior of Steel Reinforced Concrete Composite Beam-to-Girder Joints

机译:钢骨混凝土组合梁-梁节点疲劳性能的试验研究

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摘要

Fatigue behavior and failure mechanism of steel reinforced concrete (SRC) beam-to-girder joints is discussed in this paper, which is intended for use in high-speed railway station structures due to their high stiffness and load capacity. Three identical SRC beam-to-girder joint specimens were designed and tested under static loading and two stages of fatigue loading. In the first stage of fatigue loading, the specimens were subjected to design fatigue load for 2 million cycles, while during the second stage, the specimens were loaded to failure under increased fatigue loading amplitude in order to know its fatigue strength and failure mechanism. The constructional details of SRC beam-to-girder joint specimen and the method of loading and testing are presented. The comparison in structural behavior of the joint is made between under static and fatigue loading. Fatigue failure characteristics of the joint are described in detail. It is found that the SRC beam-to-girder joints remained in their elastic range and the concrete surface crack did not exceed 0.1 mm when subjected to design static loading and 2 million cycles of design fatigue loading. There was no significant difference in structural behavior of each component of SRC composite beam between static and fatigue loading. Fatigue failure occurred after these joints were applied higher-level fatigue loading for another 0.70 to 0.91 million cycles. Fatigue crack was initiated at the tension flange of I-shape steel of beam connected by welding to the flange of I-shape steel of girder or at the hole in tension flange of I-shape steel of beam, and then the crack propagated along flange width and web height of the I-shape steel in beam until the I-shape steel lost loading capacity due to lack of enough cross section. The fatigue behavior of constructional detail of the I-shape steel played a key role in the fatigue strength of the SRC beam-to-girder joints. Discussions on improving the fatigue strength of SRC beam-to-girder joints and future research aspects are presented finally.
机译:本文讨论了钢骨混凝土梁到梁节点的疲劳行为和破坏机理,该结构因其高刚度和承载能力而设计用于高速铁路车站结构。设计并测试了三个相同的SRC梁到梁节点的标本,并在静态载荷和两个疲劳载荷阶段对其进行了测试。在疲劳载荷的第一阶段,将试样承受200万次设计疲劳载荷,而在第二阶段,将试样在增大的疲劳载荷振幅下加载至破坏,以了解其疲劳强度和破坏机理。介绍了SRC梁到梁的节点标本的构造细节以及荷载和测试方法。在静载荷和疲劳载荷之间比较了接头的结构行为。详细描述了关节的疲劳破坏特性。发现在承受设计静载荷和200万次设计疲劳载荷时,SRC梁到梁的节点保持在弹性范围内,混凝土表面裂缝不超过0.1 mm。在静载荷和疲劳载荷之间,SRC复合梁的每个组件的结构行为没有显着差异。在对这些关节施加更高级别的疲劳载荷再进行0.70至91万次循环后,发生疲劳破坏。在通过焊接与梁的I形钢的法兰连接的梁的I形钢的抗拉凸缘处或梁的I形钢的抗拉凸缘的孔处产生疲劳裂纹,然后裂纹沿凸缘传播直到梁由于缺乏足够的横截面而使I形钢失去承载能力为止,I形钢在梁中的宽度和腹板高度。 I型钢结构细节的疲劳行为在SRC梁到梁节点的疲劳强度中起着关键作用。最后提出了提高SRC梁到梁节点疲劳强度的讨论和今后的研究方向。

著录项

  • 来源
    《International journal of steel structures》 |2012年第4期|461-472|共12页
  • 作者单位

    State key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China Department of Building Engineering, College of Civil Engineering, Tongji University, Shanghai, China;

    State key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China Department of Building Engineering, College of Civil Engineering, Tongji University, Shanghai, China;

    Singapore Urban Road Construction Board, Singapore;

    State key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China Department of Building Engineering, College of Civil Engineering, Tongji University, Shanghai, China;

    Department of Civil & Environmental Engineering, University of Maryland, College Park, MD 20742, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    SRC composite member; beam-to-girder joint; fatigue behavior and fracture mechanism; fatigue test;

    机译:SRC复合构件;梁到梁的连接;疲劳行为和断裂机理;疲劳测试;

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