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首页> 外文期刊>Magazine of Concrete Research >Effects of long-term loading on fire-damaged reinforced-concrete stub columns
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Effects of long-term loading on fire-damaged reinforced-concrete stub columns

机译：长期装载对火灾损坏混凝土柱的影响

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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：实验研究了长期装载对火灾损坏混凝土（RC）螺栓柱的影响。 RC短柱柱被轴向加载并加热到预定的温度。在将样品冷却至环境温度后，施加长期加载并保持98d和192d，并且由于蠕变效应而保持轴向变形。然后将标本压缩成失败。分析残余抗压强度和残余压缩刚度，以评估长期负荷对标本后火灾机械行为的影响。发现长期载荷对火灾损坏的RC柱的残留力学行为具有显着影响。火灾损坏的标本导致在装载期间明显增加了蠕变。基于ACI 209R-92中给出的模型以及原作者之前获得的火灾损坏混凝土的实验数据，提出了一种火灾诱导的蠕变改性因子，以预测在长期装载下的火灾损坏混凝土的蠕变。建议在评估火灾损坏的RC柱时考虑蠕变的效果。

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