|Study of glass breakage in compartment fire and the effect to fire dynamics
|Jiang, Liming (BEEE)
|Glass -- Fire testing
Glass -- Analysis
Hong Kong Polytechnic University -- Dissertations
|Department of Building Environment and Energy Engineering
|vi, 67 pages : color illustrations
|Nowadays, most high-rise buildings use glass façade, which has the advantages of beauty, heat insulation and reducing building load. However, in some special cases, such as fire, glass will become a brittle part in the building structure, and it is also located in the outer wall which has potential hazard to the pedestrians below. At present, most of the experiments on glass breakage researches are carried out in open space, which is not combined with the characteristics of compartment.
The purpose of this paper is to study the breakage of glass in compartment. Firstly, the radiation calculation of flame on the vertical pane was studied, and Pyrosim model was established to verify the accuracy of the formula. Then the heat transfer of glass in the thickness direction was analyzed under the heating of fire, and the stress change inside the glass. Last we carried out of compartment fire experiment, the center of this study. By collecting the temperature from the glass to investigate whether temperature gradient is the key factor of glass breakage or the accumulative heat flux can also be used as one of the prediction methods of glass breakage. It is found in this study that the temperature gradient on the glass is not the major factor leading to the glass breakage, but the heat flux can be used as a measure to it. The greater the heat flux of the glass, the greater the probability of the occurrence of cracks. The accumulated heat flow rises too quickly, which also leads to the formation of cracks.
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