火灾情况下竖井中性面多区域模型

建立了竖井侧向连续开缝和竖井侧向连续开缝及上部开口两种情况下竖井中性面位置的多区域模型,并根据火灾情况下竖井内温度的分布规律对多区域模型进行了简化。根据竖井内温度竖向分布,将竖井划分为多个区域,在Klote模型的基础上推导出竖井中性面高度。通过CFD数值模拟,将Klote模型、双区域模型及多区域模型与模拟结果进行对比,结果可知多区域模型误差最小。

A multi-zone Model for the neutral-plane Location in a Shaft in Fire

In this study,a new model was proposed for determining the location of neutral plane in shaft of building under a continuous side opening and a continuous side opening with a upper opening of the shaft.According to the temperature distribution inside shaft under fire situation,the multi-zone model was simplified.The shaft was divided into several regions,according to the vertical temperature distribution in shaft.Based on Klote model,the height of neutral plane was obtained to validate the model,a numerical study was also carried out by using a computational fluid dynamics（CFD）.The results proved that the multi-zone model was in good agreement with the simulation results.