| Title |
Analysis on Vertical Walking Speed according to Extinction Coefficient within Smoke Layers in a Staircase |
| Authors |
Lee, Soo-Ho ; Choi, Jun-Ho ; Hong, Won-Hwa |
| Keywords |
Fire ; Evacuation ; Extinction Coefficient ; Vertical Movement Velocity ; Staircase |
| Abstract |
Large complex buildings have been constructed to make every work effectively in large cities. The large complex building which features a large number of occupants and complex circulation makes it difficult to complete the emergency egress In some cases in which the fire generates the products of combustion, the smoke causes the reduction of the visibility and this may have a decisive effect on egress time. The smoke flowing through the stair case can't be ignored by the evacuee in the high rise building. Because of this, the smoke control system is required by law. However, the smoke control system can't work properly under the condition of that the fire doors are opened. Therefore, this paper is focusing on the assessment for smoke concentration by analyzing on the egress time when the smoke flows through the stair case. 96 subjects participated in this egress drill and the visibility was limited by the fog machine in order to simulate conditions in case of fire. As a result, the descent speeds in normal and smoke layer decrease by 31% and 55% for each as 0.92㎧ and 0.59㎧. Furthermore, it was found that the evacuation speed decreases as the extinction coefficient increases and the evacuation speed at the minimum extinction coefficient was 0.7㎧. |