某复合型地铁车站站台防排烟方案研究

在地铁站台火灾中，机械排烟和补风对于有效排出站台烟气至关重要，地铁设计规范要求采用正压送风方式来防止烟气经扶梯和楼梯流入站厅层。对于复合型地铁站台而言，站厅层可能与其它建筑共用，建筑面积较大，难以提供足够的风压进行正压送风。本文利用性能化防火设计方法对多种站台防排烟方案进行研究，并提出了分析流程。本文还针对某实际工程案例验证了这一流程的可行性，并据此选择了一种将机械排烟和补风有机结合的防排烟方案。本文的研究工作对其它类型地铁站台防排烟方案具有参考价值。

Study of Smoke Control for a Complex Subway Station

It is important to efficiently exhaust smoke out of the platform of subway station by mechanical ventilation and air supply. The smoke should be prevented from flowing into upper level building through the opening of escalator and stairway, so air pressurization is required in upper level building in subway design code. However, for some complex subway stations, it is difficult to design pressurization due to large spaces. The performance-based design method can be used to solve such problems. The approach for assessing various smoke control methods has been outlined in this paper. A practical case was studied and the reasonable smoke control method was suggested.