火灾环境下防火涂层对钢框架整体性能研究

Research on the Effect of Fire Retardant Coating on Overall Performance of Steel Frame

火灾环境下钢框架整体性能会发生很大变化.以两层两跨的钢框架为研究对象,分别在钢框架表面涂抹薄涂型、厚涂型防火涂料,并运用有限元软件数值模拟不同温度下钢框架力学性能的变化.研究表明:当钢框架在没有任何防火保护时,其承载力会明显小于有防火保护;当使用不同种防火涂料时,其总体的变化趋势是随着温度的不断递增应力和挠度也在不断上升,该方法通过算例验证了其正确性,可为钢结构防火研究分析提供借鉴和参考.

The overall performance of steel frame in the fire environment will change greatly. In this paper, two span two-storey steel frame was selected as the research object,which is respectively coated with thin and thick fireproof paint. The change of the mechanical behaviors of steel frames under different temperatures is simulated by using the finite element software. Research shows that when steel frame has no fire protection, its bearing ca-pacity will be significantly smaller. When using different kinds of fireproof coating, the prestress and deflection increase with the increase of temperature. The correctness of the method is verified by a numerical example, which can be used as a reference for the research and analysis of steel structure fire protection.