预制钢筋混凝土楼板抗火性能分析

Analysis on Fire-resistance of Precast Reinforced Concrete Floor Slab

预制钢筋混凝土楼板的耐火极限比现浇楼板低。本文从楼板的力学模型、预应力钢筋的耐火性能、混凝土的爆裂等方面,对预应力混凝土楼板耐火性能差的原因进行了分析。通过分析预制楼板与现浇楼板对结构抗连续倒塌能力的影响,得出了预制楼板破坏易引发建筑结构的连续性倒塌。研究结果对公安消防部队官兵的灭火救援工作及建筑内部人员的安全疏散具有参考意义。

The fire resistance rating of precast reinforced concrete floor slab is lower than that of cast-in-place floor slab.In this paper,the causes of poor fire-resistance of prestressed concrete slabs are analyzed from the mechanical model,the fire-resistance of prestressed reinforcement and the spalling of concrete. By analyzing the influence of precast floor and castin-place floor on collapse capacity of the structure,it is concluded that the precast floor can easily lead to the collapse of the building structure. The research would provide reference for officers and firemen in fire brigades during their fire fighting,rescue process and personnel evacuation in the buildings.