火场中玻璃裂纹特征与破坏条件的关联性

模拟制备了普通平板玻璃在火场中热应力和机械应力破坏下的痕迹，对痕迹的宏观特征进行了分析，研究了火源强度对热破坏玻璃痕迹的影响，以及玻璃碎片裂纹特征与受力方向的关联性。实验结果表明，玻璃热炸裂时均以玻璃中间边缘某处为集中点，形成一根贯穿玻璃的主裂纹和几根向不同方向蔓延的分裂纹；火源强度越大，树枝状裂纹主干根部产生的分裂纹越多，且越向主裂纹聚集；裂纹拐角处弓形纹特征和碎齿状裂纹出现位置与受力方向有着紧密的关联性，而现场勘查仅依据碎齿位置和弓形纹特征是不准确的。

Research on relationship of crack characteristics and failure condition of glass in fire scene

The traces of ordinary flat glass under thermal stress and mechanical stress are simulated.The macroscopic characteristics of the traces are analyzed.The influence of the intensity of fire source on the traces of thermal damage and the correlation between the crack characteristics of glass fragments and the direction of force are studied.The experimental results show that a main crack and several split cracks propagating in different directions are formed at the center edge of the glass when the glass is hot-exploded.The greater the intensity of the fire source,the more split cracks are produced at the main root of the dendritic crack,and the more they aggregate towards the main crack.The characteristics of the arch and the location of the fragmentary cracks is closely related to the direction of force,and it is inaccurate to only base on the location of broken teeth and the characteristics of arch lines in field investigation.