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Transverse fatigue behaviour of lightly reinforced concrete bridge decks

机译：轻钢筋混凝土桥面板的横向疲劳行为

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摘要

The transverse fatigue behaviour of the top slab of box-girder bridges is dealt with in this paper. The cantilevers and central span of the top slab usually require a small reinforcement ratio and significant slenderness to fulfil the static design requirements. Nevertheless, the application of a high number of load cycles due to traffic or train passages may lead to fatigue damage accumulation. An experimental program on half-scale specimens reproducing the bridge slab was carried out. The fatigue failure was due to brittle fracture of the reinforcement, which could be predicted safely by available S-N curves. Furthermore, the experimental results showed the cycle-dependent reduction of tension stiffening, which was very significant due to the large tension stiffening capacity of lightly reinforced members. Special attention was paid to the development of negative tension stiffening contribution at unloading stages. This effect indicates that permanent and residual cracks and deflections are larger than those calculated with the fully cracked member. The experimental results showed that negative tension stiffening in members manufactured with self-compacting concrete can be larger than those with normally vibrated concrete.
机译：本文研究了箱形梁顶板的横向疲劳行为。顶部平板的悬臂和中心跨度通常需要较小的增强比和显着的细长度才能满足静态设计要求。然而，由于交通或火车通过而施加大量负载循环可能会导致疲劳损伤累积。对复制桥板的半尺寸试样进行了实验程序。疲劳破坏是由于钢筋的脆性断裂，可以通过可用的S-N曲线安全地预测。此外，实验结果表明，随周期变化的抗拉强度降低是非常重要的，这是由于轻度增强构件的抗拉强度大。在卸货阶段特别注意负张力加强作用的发展。这种效果表明，永久和残余的裂纹和挠度比完全破裂的构件要大。实验结果表明，用自密实混凝土制得的构件的负张力刚度可以比用普通振动混凝土制得的构件大。

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  • 来源
    《Engineering Structures》 |2011年第10期|p.2839-2849|共11页
  • 作者

    Carlos Zanuy; Luis Felipe Maya; Luis Albajar; Pablo de la Fuente;

  • 作者单位

    Department of Continuum Mechanics and Structures, ETS Ingenieros de Caminos, Universidad Politecnica de Madrid, Spain;

    Department of Continuum Mechanics and Structures, ETS Ingenieros de Caminos, Universidad Politecnica de Madrid, Spain;

    Department of Continuum Mechanics and Structures, ETS Ingenieros de Caminos, Universidad Politecnica de Madrid, Spain;

    Department of Continuum Mechanics and Structures, ETS Ingenieros de Caminos, Universidad Politecnica de Madrid, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    reinforced concrete; bridge girders; fatigue; transverse cracking; tension stiffening;

    机译：钢筋混凝土桥梁疲劳;横向开裂张力加强;

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