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Dynamic properties of concrete and fiber reinforced concrete at room and elevated temperatures.

机译：混凝土和纤维增强混凝土在室温和高温下的动态特性。

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摘要

A drop hammer facility, which allows steel weights to be dropped from a height of 16 ft, was built at The University of Utah Structures Laboratory. The drop hammer facility was used to perform a series of dynamic tests on concrete cylinders with and without fiber reinforcement from heights of 16 ft and 8 ft. In July 2011 strain gauges, load cells and high speed cameras were used to collect data from dynamic splitting tension (tension) and compression tests performed on cylinders at room temperature. Additional cylinders were heated to 400F before they were tested in April 2012.;After testing, various methods were considered to determine the strain rate of the concrete. The dynamic impact factor (DIF), a ratio of peak dynamic load to quasi-static strength was also determined. Concrete has been known to have higher capacities when loaded dynamically. Thus, it is of interest to determine a factor that can be applied during design to account for this increase in strength. Models that have been produced to determine the DIF based on the strain rate were reviewed and compared with the test results.;As predicted by these models, the DIF results for both the compression and tension tests increased as the strain rate increased. The tension results were comparable with the model, whereas, the compression model was much more conservative than the results. When compared to the tension model, compression specimens require much higher strain rates to produce similar DIFs. For tension specimens, DIFs were recorded as.;high as 4.1 at a strain rate of 1.2 in./in./sec. For compression specimens, the highest DIF was 3.2 at a strain rate of 12.1 in./in./sec.;For compression tests at room temperature, fiber reinforce concrete (FRC) specimens did not perform as well as normal weight concrete (NWC) specimens when tested dynamically. For compression and tension tests on NWC, heated specimens had lower DIFs than room temperature specimens at higher strain rates. However, when tested at lower strain rates, there was no significant decrease. FRC specimens tested in tension at elevated temperatures exhibited a decrease in DIF when compared to room temperature.
机译：犹他大学结构实验室建造了一个落锤装置，可以从16英尺高的地方掉落钢制砝码。落锤装置用于对高度为16英尺和8英尺的带或不带纤维增强的混凝土圆柱体进行一系列动态测试。2011年7月，使用应变仪，称重传感器和高速摄像头从动态分裂中收集数据在室温下对钢瓶进行拉伸（拉伸）和压缩测试。在2012年4月进行测试之前，将另外的钢瓶加热到400°F。;在测试之后，考虑了各种方法来确定混凝土的应变率。还确定了动态影响因子（DIF），即峰值动态载荷与准静态强度之比。已知混凝土在动态加载时具有更高的容量。因此，感兴趣的是确定可以在设计期间应用以解决强度增加的因素。审查了根据应变率确定DIF的模型，并将其与测试结果进行了比较；如这些模型所预测的，压缩和拉伸试验的DIF结果都随着应变率的增加而增加。拉伸结果与模型相当，而压缩模型比结果保守得多。与张力模型相比，压缩样本需要更高的应变率才能产生相似的DIF。对于拉伸试样，DIF记录为1.2英寸/英寸/秒的应变速率，最高为4.1。对于受压样品，应变速率为12.1英寸/英寸/秒的最高DIF为3.2;对于在室温下进行的压缩测试，纤维增强混凝土（FRC）样品的性能不如普通重量混凝土（NWC）动态测试时的样本。对于在NWC上进行的压缩和拉伸测试，在较高的应变速率下，加热后的样品具有比室温样品更低的DIF。但是，在较低的应变率下进行测试时，并没有明显降低。与室温相比，在高温下进行拉伸测试的FRC样品的DIF降低。

著录项

  • 作者

    Weidner, Anna Marie.;

  • 作者单位

    The University of Utah.;

  • 授予单位 The University of Utah.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2013
  • 页码 162 p.
  • 总页数 162
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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