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Effects of long-term loading on fire-damaged reinforced-concrete stub columns

机译：长期荷载对失火钢筋混凝土短柱的影响

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摘要

The effect of long-term loading on fire-damaged reinforced-concrete (RC) stub columns was experimentally investigated. RC stub columns were axially loaded and heated to predetermined temperatures. After the specimens were cooled to ambient temperature, long-term loading was applied and kept constant for 98 d and 192 d and axial deformations due to the creep effect were recorded. The specimens were then compressed to failure. The residual compressive strength and residual compression stiffness were analysed to assess the effect of long-term loading on the post-fire mechanical behaviour of the specimens. It was found that long-term loading had a significant effect on the residual mechanical behaviour of fire-damaged RC stub columns. The fire-damaged specimens resulted in obviously increased creep during the loading period. Based on the model given in ACI 209R-92 and existing experimental data on fire-damaged concrete obtained previously by the authors, a fire-induced creep modification factor is proposed to predict the creep of fire-damaged concrete under long-term loading. It is recommended that the effect of creep should be taken into consideration in assessing fire-damaged RC columns.
机译：实验研究了长期荷载对钢筋混凝土（RC）短柱的长期影响。 RC短管柱被轴向加载并加热到预定温度。将样品冷却至环境温度后，施加长期载荷并在98 d和192 d保持恒定，并记录由于蠕变效应引起的轴向变形。然后将样品压缩至破坏。分析了残余抗压强度和残余抗压刚度，以评估长期载荷对试样燃烧后力学行为的影响。研究发现，长期荷载对失火的RC短管柱的残余力学性能有显着影响。火灾损坏的试样在加载期间导致蠕变明显增加。基于ACI 209R-92中给出的模型以及作者先前获得的有关火灾混凝土的实验数据，提出了火灾引起的蠕变修正因子，以预测长期荷载下火灾混凝土的蠕变。建议在评估火灾中的钢筋混凝土柱时应考虑蠕变的影响。

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  • 来源
    《Magazine of Concrete Research》 |2019年第10期|476-487|共12页
  • 作者

    Huo Jingsi; Liu Hanqing; Xu Xi;

  • 作者单位

    Huaqiao Univ, Coll Civil Engn, Xiamen, Peoples R China;

    Hunan Univ, Coll Civil Engn, China Minist Educ, Key Lab Bldg Safety & Energy Efficiency, Changsha, Hunan, Peoples R China;

    Hunan Univ, Coll Civil Engn, China Minist Educ, Key Lab Bldg Safety & Energy Efficiency, Changsha, Hunan, 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

    compressive strength; temperature-related thermal effects; testing, apparatus methods;

    机译：抗压强度;温度相关和热效应;测试;装置和方法;

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