火灾下钢筋混凝土楼板的薄膜效应分析
DOI: 10.3969/j.issn.1006-7043.2009.08.005
Keywords: 火灾 薄膜效应 钢筋混凝土楼板 协调方程 二重Fourier级数
Abstract:
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、薄膜力以及应力一应变的表达式.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.
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