高大空间非均匀受火钢结构整体稳定性

Overall stability of steel structure under the inhomogeneous fire in large space

以某会展中心为例,提出也非均匀受火钢结构整体稳定性分析方法。将火灾发展过程中随时空变化的烟气温度场与结构应力场耦合,以FDS和ANSYS实现火灾全过程非均匀受火钢结构整体稳定性时变分析。设计两个火源位置的不同火灾场景分析温度分布,利用MATLAB编程的方法获得钢构件各节点的温升曲线,应用ANSYS分析钢结构应力及位移分布,得出不同场景下钢结构是否出现整体失稳及整体失稳时间。

The analysis method of overall stability of steel strut lure under inhomogeneous fire was put forward with the exam- pie of a conference and exhibition center. The smoke tempera- ture field and the structure stress field which changes with the time and location during the development of fire were coupled, and the FDS and ANSYS were used to carry out tile time vat ying analysis of overall stability of steel structure under inhomo geneous fire during the whole process of fire. Fire scenarios with two fire location were designed to analyze the temperature dis- tribullon. The curve of temperature rise at each node of steel structure was obtained by MATLAB, and the distribution of structure stress and displacement were obtained by ANSYS, to find out if the overall stability of steel structure was destroyed and the time of destruction under different scenarios.