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在火灾环境中,玻璃因受热产生热应力,当热应力大于其自身的临界破裂应力时,会导致玻璃破裂甚至脱落。玻璃在火灾环境下的破裂,会进一步引起火灾向隔壁区域蔓延,加大火灾的危险性。该文采用有限元法求解玻璃的一维热传导方程,并利用温差准则对三种典型热荷载作用下(热辐射、城乡交界域火灾和室内火灾)的玻璃首次破裂时间进行了预测研究。将模拟结果与前人的计算和实验结果比较,验证了模型的适用性和代码的可靠性。
In a fire environment, glass heat stress due to heat, when the thermal stress is greater than its own critical rupture stress, it will lead to glass rupture and even fall off. The breakdown of glass in a fire environment will further cause the fire to spread to the next area and increase the danger of fire. In this paper, the one-dimensional heat conduction equation of glass is solved by finite element method, and the prediction of the first rupture time of glass under three typical thermal loads (thermal radiation, urban-rural boundary zone fire and indoor fire) is carried out by using the temperature difference criterion. Comparing the simulation results with the previous ones, the applicability of the model and the reliability of the code are verified.