预测火灾情况下竖井中性面位置的连续模型

摘要

针对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,在Klote模型的基础上,根据竖井内温度在竖向上连续分布的特点,建立了预测火灾情况下竖井中性面高度的连续模型.通过计算流体力学模拟,将Klote模型、双区域模型及连续模型与模拟结果进行对比.结果表明,连续模型偏差最小；通过分析连续模型计算结果可知,中性面高度受火源功率的影响较小,主要和开口情况有关.%A model was proposed for determining the location of neutral-plane in a shaft with a continuous side opening or with both a continuous side opening and a upper opening. Based on the Klote model, the new model was simplified according to the temperature distribution inside the shaft in fire. A numerical study was also carried out by using a computational fluid dynamics (CFD). The results prove that the new model is in good agreement with the simulation results.