NUMERICAL STUDY ON THE EFFECT OF EXTERNAL AIR VELOCITY AND DIRECTION ON FLAME SPREAD IN HIGH RISE BUILDING WITH THE ALUMINUM COMPOSITE EXTERNAL MATERIALS

알루미늄 복합 외장재를 사용한 고층 건축물의 외기 풍속, 풍향 변화가 화염전파에 미치는 영향에 대한 수치해석 연구

The aluminum composite panel are widely used for the external materials of high rise building because of well insulation of heat and sound and improved Constructability. However, the polyethylene in main material of the aluminum composite panel shows weakness in thermal and fire resistances. For this reason, flame is spread more quickly when the fire break out. Therefore, the potentiality of fire spread to the exterior wall is high due to difficulty of early extinguishment and effect of external air. In this study, numerical investigation was performed by using FDS program for flame spread characteristics with various external air velocity and direction in ten-story building with the aluminum composite external materials. As a result, the flame spread velocity is 0.134m/s and it takes 224 seconds for flames to spread to the 10th floor without external air velocity. however, the flame spread velocity decreases 40% and it takes 348 seconds for flames to spread to the 10th floor when external air velocity is 2.5 m/s. and air direction is little effect compared to air velocity.