Physical Model Study On Smoke Control In Atrium Buildings

The "large-volume" structure and universal adaptation of atrium in modern buildings has challenged smoke control technology adopted in traditional buildings, and thus precipitated the emergence of a new subject: "smoke management in atrium under fire" in the field of smoke control in building. Based on the method of physical model study, experimental study on smoke control in atrium has been carried out in this paper. This research can make up for experimental study shortages in the field of smoke control in atrium. And its results can offer valuable references for academic studies and smoke control designs in practice.Through the experimental study, abundant temperature data and the laws of temperature distributing in atrium under fire have been gained in the paper. All these can offer abundant and valuable data for academic and experimental studies in architecture fire safety research.Through the research on the fire burning in an atrium used as accoutrement mall, it is found that the impact of venting rate, make-up air inlets' positions and make-up air flux on a fire growth is comparatively great. At one time it is indicated that in the beginning phase a fire in an accoutrement mall is "linear and undulate" fire in terms of gravity ventilation. Whereas, it is ""fire in terms of mechanical ventilation.In this paper the research on smoke filling atrium under fire was carried out. And the impacts of factors, such as venting form, venting rate, make-up air inlets' positions and bodily form coefficient on the velocity and height of smoke filling atrium under fire were researched, too. Through the analysis on the experimental results, the regress equations about smoke layer's height change with time were estimated. And it is also found that in terms of mechanical ventilation the greater the venting rate is and the higher make-up air inlets are, the slower the velocity of smoke filling atrium under fire is and further more the higher the smoke layer's steady height is. Two model atria with different bodily form coefficients were set up in the paper. Through the research on the velocities of smoke filling the two atria it is found that in the atrium which bodily form coefficient is 2.0 the velocity of smoke filling the atrium is relatively slower. But in the atrium which bodily form coefficient is 1.7 it is relatively faster.