- Topic
Safety/ Infrastructure
- AuthorYoon-Shin Bae, Jong-Seok Won, Jae-Do Kang, Sang-Gyoon Kim
The rapid increase in large-scale underground-inked complex buildings due to urban overcrowding is accelerating the risk of large-scale urban fires. As of 2024, there are 211 large-scale underground-inked complex buildings in Seoul, an increase of about 24% compared to 2018. Moreover, about 60% of the nation's underground-inked complex buildings are concentrated in Seoul. In case of a fire in underground areas of these complex buildings, unlike typical buildings, fire and smoke can spread through underground structures, intensifying confusion for evacuees. Analysis of fire statistics in this study revealed that fires occurring in underground floors resulted in more casualties and property damage per incident than above-ground fires. They also took longer to extinguish.
Field investigations confirmed that in the event of an accident, damage could be amplified due to a large number of unspecified floating population, complex structures, diverse management entities and issues with movement routes and management. Particularly, disaster-vulnerable individuals who have slower movement speeds and decision-making abilities than the general public could suffer significant damage. Therefore, Seoul city ordinances recommend using digital technology to enhance evacuation effectiveness and support disaster-vulnerable individuals.
Fire and evacuation simulations were analysed for underground-inked complex buildings in Seoul, distinguishing between the general public and disaster-vulnerable individuals. Even after changing stairs to ramps and improving the internal spacing of entrance facilities to reduce evacuation time, evacuation remained difficult for disaster-vulnerable individuals, excluding the general public. Therefore, to increase movement speeds of both the general public and disaster-vulnerable individuals during accidents and reduce congestion in main evacuation routes, it is necessary to consider installing equipment and facilities that can increase movement speeds of disaster- vulnerable individuals. It is also necessary to complement evacuation with digital technology, in addition to facility improvements.
The following policies are proposed to enhance evacuation effectiveness in Seoul’s underground-inked complex buildings, focusing on disaster- vulnerable individuals:
First, management blind spots should be improved. The management entity for areas connecting buildings with underground shopping centers or subway stations should be clearly defined. Disaster management obligations, including evacuation plans for these areas, should be established. A joint management body, tentatively called a disaster management council, should be formed. Second, evacuation standards must be improved. Comprehensive and detailed standards for evacuation and fire safety facilities should be established, taking into account characteristics of buildings. In particular, there is a need to actively incorporate Seoul’s performance-based design guidelines. Additionally, improvements should focus on the internal spacing of entrance facilities, smoke control systems and evacuation capacity standards.
Third, facilities and equipment related to evacuation should be improved. In particular, it is necessary to improve ramps in parallel with stairs, integrated fire shutters, evacuation guide lines, evacuation exit guidance lights, visual alarms and subway turnstiles.
Lastly, digital technology should be introduced to enhance evacuation effectiveness. However, reliability must be very high before actual application.
Technologies to be considered for introduction include those that can detect disaster situations within facilities, select optimal routes and guide evacuation routes, support the movement of disaster-vulnerable individuals and provide safe evacuation spaces. These technologies could utilise the Internet of Things, artificial intelligence, virtual augmented reality, high-frequency and beacons