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首页> 外文期刊>Magazine of Concrete Research >In situ stresses in bridge beams. Part I: concrete stresses
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In situ stresses in bridge beams. Part I: concrete stresses

机译:桥梁梁的原位应力。第一部分:具体压力

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摘要

An advanced investigation of the core-drilling method (CDM) for direct application in bridge assessment is conducted. In the CDM a small hole is drilled into concrete and the displacements that occur as a result of load redistribution around the hole are measured and related to in situ stress. Knowledge of the stress profile within the concrete of a girder would allow determination of the magnitude and location of force in its prestressing steel. This paper discusses evaluations of concrete stresses with the CDM using drilled holes 100, 75 and 50 mm in diameter, because existing work used the size 150 mm, which is impractical in field evaluations of many bridge girders. The present paper verifies that the method can be used with relatively small holes to determine stresses in concrete slabs; the technique has also been used to investigate the stresses in a prestressed girder and its prestressing steel, showing that the in situ prestressing force could be determined (see the companion paper). The tests herein show that the CDM with small holes gives stress predictions with an average error of 1.01 MPa, 16.7% of the applied stress. The accuracy is relatively independent of the hole size (for the sizes considered), and thus future investigations in structures can consider using these smaller hole sizes.
机译:对直接应用于桥梁评估的岩心钻探方法(CDM)进行了深入研究。在CDM中,在混凝土中钻了一个小孔,并测量了由于孔周围的载荷重新分布而产生的位移,并与原位应力有关。了解大梁混凝土内的应力分布,可以确定其预应力钢中力的大小和位置。本文讨论了使用直径为100、75和50毫米的钻孔的CDM对混凝土应力的评估,因为现有工作使用的尺寸为150毫米,这在许多桥梁的现场评估中是不切实际的。本文验证了该方法可用于相对较小的孔来确定混凝土板中的应力。该技术也已用于研究预应力梁及其预应力钢中的应力,表明可以确定就地预应力(请参见随附论文)。本文的测试表明,带有小孔的CDM给出了应力预测,平均误差为1.01 MPa,占施加应力的16.7%。精度相对独立于孔尺寸(对于所考虑的尺寸),因此将来对结构的研究可以考虑使用这些较小的孔尺寸。

著录项

  • 来源
    《Magazine of Concrete Research》 |2015年第10期|459-466|共8页
  • 作者

    McGinnis Michael J.;

  • 作者单位

    Univ Texas Tyler, Dept Civil Engn, Tyler, TX 75799 USA;

  • 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

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