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Structural analysis of reinforced concrete chimneys subjected to uncontrolled fire

机译：失控火灾下钢筋混凝土烟囱的结构分析

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摘要

We studied the behavior and residual structural capacity of reinforced concrete chimneys subjected to an uncontrolled fire. We used a combination of a heat transfer finite element model - to obtain the temporal distributions of temperature during the fire event - and the structural model of concrete chimney design provided by the American Concrete Institute (AC1307-08). This approach allows estimating the reduction in the vertical (axial) strength and moment strength of the chimney both during a fire and post-fire, and gives a direct estimate of the reduction in the safety factors of the concrete chimney. Using this method, we examined the impact of various design parameters on the residual structural capacity of a concrete chimney subjected to an internal fire. An iterative finite element method was also presented as an alternative to the ACI 307 calculations. Moreover, finite element calculations were used to study the role of thermal stresses on the axial strength of the chimney during fire. Our study provides insight into possible failure mechanisms of concrete chimneys damaged due to fire and could suggest possible approaches for minimizing the risk of chimney failure due to an uncontrolled fire.
机译：我们研究了不受控制的火灾下钢筋混凝土烟囱的行为和残余结构能力。我们结合使用了传热有限元模型-获得火灾期间的温度临时分布-以及美国混凝土协会（AC1307-08）提供的混凝土烟囱设计的结构模型。这种方法可以估计着火期间和后着火期间烟囱的垂直（轴向）强度和抗弯强度的降低，并且可以直接估计混凝土烟囱的安全系数的降低。使用这种方法，我们检查了各种设计参数对遭受内部火灾的混凝土烟囱剩余结构容量的影响。还提出了一种迭代有限元方法，作为ACI 307计算的替代方法。此外，使用有限元计算来研究热应力对烟囱着火时轴向强度的作用。我们的研究提供了对因火灾而损坏的混凝土烟囱的可能失效机理的见解，并可能提出了一些可能的方法，以最大程度地减少由于不受控制的火灾而导致烟囱失效的风险。

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