保护层厚度、板厚及受荷水平对钢筋混凝土板耐火极限的影响

Influence of protective layer thickness, slabs thickness and load level on the refractory limit of reinforced concrete slabs

通过对钢筋混凝土板温度场进行数值模拟,研究了钢筋混凝土板的耐火极限与混凝土保护层厚度、板厚及受荷水平之间的关系。结果表明:耐火极限随混凝土保护层厚度的增大有显著的提高,而钢筋混凝土板厚对楼板的耐火极限基本没有影响;钢筋混凝土板承受的荷载水平越高,其耐火极限越低。

Through numerical simulation of the temperature field of reinforced concrete slabs, the relationship between the refractory limit of reinforced concrete slabs and the concrete protective layer thickness, the thickness of the slab and the load level of the slab was studied. The results show that the refractory limit increases significantly as the concrete protective layer thickness increases, while the reinforced concrete slab thickness has no effect on the refractory limit of the slabs;the higher the load level the reinforced concrete slab bears, the lower the refractory limit.