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利用火灾动力学模拟软件FDS,模拟了大空间火灾作用下裸露钢梁及钢柱的升温情况。介绍了绝缘表面温度法的基本原理。通过对FDS模拟得到的钢构件不同位置处的绝缘表面温度与周围气体温度的比较,显示了大空间火灾中火焰辐射对钢构件不同部位升温计算的影响,并据此对大空间火灾作用下钢构件升温计算中入射热的计算问题给出了建议。
The fire dynamics simulation software FDS was used to simulate the temperature rise of exposed steel beams and columns under the action of large space fire. The basic principle of insulation surface temperature method is introduced. The comparison between the temperature of the insulation surface and the ambient gas temperature at different positions of the steel member simulated by FDS shows the influence of flame radiation on the temperature calculation of different parts of the steel structure in the large space fire and accordingly, Some suggestions are given to the calculation of incident heat in the calculation of component temperature.