纤维对混凝土筒体高温下变形的影响
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国家自然科学基金资助项目(51578109)


Effect of Fibers on Deformation Behavior of Concrete Pipe at High Temperature
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    摘要:

    通过燃烧液化气模拟隧道火灾的高温作用,研究了普通钢筋网、单掺及混掺钢纤维(SF)和聚丙烯(PP)纤维对混凝土筒体在明火高温下以及高温冷却后的变形性能,对比了不同纤维类型和纤维掺量(质量)下筒体经历1次和2次高温循环后的径向位移、高温后的残余径向位移,分析了承受高温过程中混凝土筒体筒壁温度以及筒壁内外温差的变化特点.结果表明:在热气温度稳定阶段末期,混凝土筒体内外温差、径向位移均达到最大值;单掺钢纤维、混掺钢纤维与聚丙烯纤维对减少混凝土筒体在高温作用下的径向位移有显著作用;高温循环使筒体产生径向残余变形,而混杂纤维对限制筒体高温后的残余径向位移具有正混杂效应.

    Abstract:

    To simulate high temperature effect of tunnel fires, liquefied gas burning tests were carried out. The deformation behavior of concrete pipes reinforced with steel mesh, steel fibers(SF) and polypropylene(PP) fibers at high temperature and after cooling was investigated. Variation law of temperature and temperature difference across the outside and inside layer of the pipes under high temperature were summarized. Influence of fiber type and content(by mass) on the radial deformation at high temperature and residual radial deformation after cooling was analyzed during once and twice heating cooling test. It can be concluded that, both of the temperature difference between the inside and outside layers and radial deformation of the concrete pipes reach the maximum at the end of gas temperature stable stage. The use of SF or hybrid use of SF and PP fiber has a significant effect on reduction of the maximum radial deformation of the pipes at high temperature.Residual radial deformation can be observed after the cyclic high temperature test and there exists a hybrid effect on restriction of the residual radial deformation after cooling.

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柳根金,丁一宁.纤维对混凝土筒体高温下变形的影响[J].建筑材料学报,2018,21(5):786-791

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  • 收稿日期:2017-11-06
  • 最后修改日期:2018-03-05
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  • 在线发布日期: 2018-10-31
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