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首页> 外文期刊>Magazine of Concrete Research >Measurement of bar strain during pull-out tests: use of electrical resistance gauge methods under large displacement
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Measurement of bar strain during pull-out tests: use of electrical resistance gauge methods under large displacement

机译：拔出测试中条形应变的测量：大位移下使用电阻计方法

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摘要

Two issues make measuring the local bond stress-slip relationship difficult: first, the bar is embedded within the concrete, making measurement of local strain values complex; second, yielding of the steel bar influences the bond stress-slip behaviour. Global bond stress-slip behaviour is generally obtained by measuring the slip that occurs at the free end of the bar during pull-out testing. Several distinct mounting methods have been used to install electrical resistance strain gauges on embedded bars in concrete to obtain local strain data. These methods are reviewed in relation to their ability to deliver reliable and robust data at both small and large values of slip. The use of such strain gauges is found to provide a viable method for assessing the variation in strain along embedded steel bars during pull-out testing. The use of surface-mounted strain gauges leads to high failure rates due to physical damage to either the gauges or their connections. The use of near-surface-and central-groove-mounted strain gauges enables measurement of local bar strain over large displacements. Using data from near-surface-mounted strain gauges, it is shown that in the post-peak region the bond stress increases linearly from the free end of the bar.
机译：有两个问题使测量局部粘结应力-滑动关系变得困难：首先，钢筋被埋在混凝土中，使得局部应变值的测量变得复杂。其次，钢筋的屈服会影响粘结应力-滑移行为。整体粘结应力-滑动行为通常是通过测量拉出测试过程中发生在钢筋自由端的滑动来获得的。已使用几种不同的安装方法将电阻应变仪安装在混凝土中的嵌条上以获得局部应变数据。关于这些方法在小滑差值和大滑差值时均能提供可靠而可靠的数据的能力，对其进行了综述。发现使用这种应变仪可提供一种可行的方法，用于评估拉拔测试过程中沿嵌入式钢筋的应变变化。由于应变计或其连接的物理损坏，使用表面安装式应变计会导致较高的故障率。使用近表面和中央槽安装的应变仪可以测量大位移下的局部钢筋应变。使用来自近表面安装的应变仪的数据，表明在峰后区域，结合应力从钢筋的自由端开始线性增加。

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  • 来源
    《Magazine of Concrete Research》 |2015年第10期|523-531|共9页
  • 作者

    Lee Baeg; Mulheron Mike;

  • 作者单位

    Korea Rural Community Corp, Rural Res Inst, Ansan, Gyeonggi Do, South Korea;

    Univ Surrey, Fac Engn & Phys Sci, Construct Mat, Guildford GU2 5XH, Surrey, England;

  • 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
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