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Contribution to the Numerical Modelling of the Spalling Phenomenon: Case of a Reinforced Concrete Beams

机译:对剥落现象的数值建模的贡献:以钢筋混凝土梁为例

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The paper presents a numerical study of reinforced concrete (RC) beams in fire, in which spalling is taken into account in a simplified manner and its effects on the structural response are investigated. Finite element simulations are conducted using the software SAFIR. The criteria to determine the onset of spalling are the temperature reached in the finite element: concrete layers are removed when their temperature reaches . The effect of spalling on the temperature distribution inside the beam section and on the time of failure is discussed. Different configurations are studied, in terms of extent of spalling along the beam and type of supports. Further, it is also shown that the extent of spalling has significant influence on the fire resistance of RC beams and that this is by reducing the failure time and/or by reducing the yield strength and tangent modulus.
机译:本文提出了火灾中钢筋混凝土梁的数值研究,其中以简化的方式考虑了剥落,并研究了其对结构响应的影响。使用软件SAFIR进行有限元模拟。确定剥落开始的标准是有限元中达到的温度:温度达到时将混凝土层移除。讨论了剥落对梁截面内部温度分布和破坏时间的影响。就沿梁的剥落程度和支座类型而言,研究了不同的配置。此外,还显示出剥落的程度对RC梁的耐火性具有重大影响,这是通过减少失效时间和/或通过降低屈服强度和切线模量来实现的。

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