【摘要】 为了研究火灾下钢筋混凝土楼板的抗火性能,根据材料在不同温度的本构模型,对考虑薄膜作用的火灾下钢筋混凝土板进行了分析.通过分析板块中面的平衡方程及位移协调方程,建立了由板位移和Airy应力函数表示的2个微分控制方程.采用二重Fourier级数解推导了火灾作用下楼板的位移、薄膜力以及应力-应变的表达式.所得的计算结果与试验结果吻合较好.该研究为考虑薄膜效应时楼板的抗火设计提供了参考,对发挥楼板的抗火潜能、降低结构抗火成本有重要意义.更多还原

【Abstract】 To determine the fire-retardant performance of reinforced concrete slabs,in the light of the constitutive model of materials at different temperatures,it was analyzed using the membrane effect.Based on the force equilibrium and geometric compatibility equations of the middle plane,two governing differential equations for calculating the displacement of a slab and the Airy stress function were derived.Expressions of displacement,membrane force and stress-strain were deduced by the double Fourier series.The accuracy with which these expressions reflect the membrane effects of slabs in a fire was validated through a comparison between results from experiments and different theoretical simulations.This research is important for fire engineering purposes and is of great significance for determining the fire-resistant potential of reinforced concrete slabs and thus reducing the cost of building a fire-resistant structure.更多还原