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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 the steel frame under fire environment will change greatly.With the steel frame of two floors and two spans as the research object, thin coating and thick coating fire-retardant coating are respectively applied on the surface of steel frame, and finite element software is used to simulate the temperature The research shows that when the steel frame does not have any fire protection, its bearing capacity will be significantly less than that of the fire protection. When different kinds of fire retardant coatings are used, the overall trend is that with the temperature Increasing stress and deflection are also increasing. The correctness of this method is validated by an example, which can provide reference and reference for the research on fire protection of steel structures.