火灾时钢筋混凝土板的承载力计算

Calculation of Bearing Capacity of RC Concrete Slabs in Fire

提出了2种能考虑火灾时钢筋混凝土板薄膜效应的极限承载力计算方法。在塑性铰线理论的基础上,利用板块平衡法和虚功法对火灾时钢筋混凝土板的承载力进行了计算,并将计算结果与试验结果进行了对比。结果表明:承载力计算结果与试验结果吻合良好;提出的方法适用于各向同性和各向异性配筋的方形板和矩形板;采用该方法可以解释相同条件下方形板和矩形板产生的破坏挠度不同的原因。

Two methods which could consider tensile membrane action were offered to calculate the limit bearing capacity of reinforced concrete slabs in fire conditions. Based on yield hinge line theory, the bearing capacity of reinforced concrete slabs in fire conditions was calculated by using segment equilibrium method and energy-based method. The comparison of calculated results and test results was carried out. The results show that the methods can be applied to sqaure slabs and rectangular slabs with orthotropic and isotropic renforcement. The models can interpret why the difference between sqaure slabs and rectangular slabs exists under the same condition.