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Triaxial experimental study of concrete with control of one stress and two strains

机译:一应力二应变控制的混凝土三轴试验研究

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摘要

The behaviour of cubic concrete specimens (100 x 100 x 100 mm) subjected to a mixed path of both stress and strain loading was investigated. The specimens were statically loaded in a true triaxial apparatus. Three different values of the minimum principal stresses were chosen (10, 15 and 20 MPa). In addition, for each value of the minimum principal stress, three or four strain rate ratios between the x-axis and the y-axis were used (0.25, 0.5, 0.75 and 1.0). The first and second peak stresses occurred in the maximum principal strain axis (y-axis) and the intermediate principal strain axis (x-axis), respectively. The maximum principal stress and the intermediate principal stress did not always exist in a fixed axis, which is related to the strain rate ratios. Some damage formed due to previous load histories, including the peak stress of the y-axis, results in a decreased load carrying capacity in the x-axis. Therefore, the peak stress of the intermediate principal strain axis (x-axis) was lower than that of the maximum principal strain axis (y-axis). Moreover, the y-axis strain corresponding to the first peak stress and the x-axis strain corresponding to the second peak stress were essentially equal. It was found that there is a limit state in concrete: if the strain difference between y- and z-axes and between x-and z-axes is large enough, the load carrying capacities of the y- and x-axes are the same, with the value related to the minimum principal stress and independent of the strain rate ratio.
机译:研究了立方混凝土试样(100 x 100 x 100 mm)在应力和应变载荷混合路径下的行为。将样本静态加载到真正的三轴设备中。选择了三个不同的最小主应力值(10、15和20 MPa)。另外,对于最小主应力的每个值,在x轴和y轴之间使用三个或四个应变率比(0.25、0.5、0.75和1.0)。第一峰值应力和第二峰值应力分别出现在最大主应变轴(y轴)和中间主应变轴(x轴)上。最大主应力和中间主应力并不总是存在于固定轴上,这与应变率比有关。由于先前的载荷历史(包括y轴的峰值应力)而形成的某些损坏会导致x轴的承载能力下降。因此,中间主应变轴(x轴)的峰值应力低于最大主应变轴(y轴)的峰值应力。此外,对应于第一峰值应力的y轴应变和对应于第二峰值应力的x轴应变基本上相等。发现混凝土中存在极限状态:如果y轴和z轴之间以及x轴和z轴之间的应变差足够大,则y轴和x轴的承载能力是相同的,其值与最小主应力有关,并且与应变率比无关。

著录项

  • 来源
    《Magazine of Concrete Research》 |2018年第14期|649-661|共13页
  • 作者

    Wang Zhe; Li Jing;

  • 作者单位

    Beijing Jiaotong Univ, Sch Civil Engn, Beijing, Peoples R China;

    Beijing Jiaotong Univ, Sch Civil Engn, Beijing, Peoples R China;

  • 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

    failure; plain; concrete; shear;

    机译:破坏;平整;混凝土;剪切;
  • 入库时间 2022-08-18 00:16:34

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