本研究主要分為兩個部分，第一個部分主要是以美國國家標準局之建築防火研究室(NIST/BFRL)所發展的CFD火災模擬軟體FDS(Fire Dynamics Simulator)來模擬暫態的密空間的火場，再以文獻的實驗驗證用大尺度渦流模擬(LES)法在模擬房間紊流流場及溫度分佈之能力，並依Smagorinsky模式裡不同經驗參數的模擬結果根據實驗數據來加以分析比較，結果顯示在通風口的速度場及溫度場分佈與實驗數據比較都有令人滿意的結果。在驗證模擬之可靠性後，第二個部分將針對不同熱釋放率並將原本設為絕熱的天花板給定合理之混凝土相關性質，並假設材料性質分佈均勻，以一維共軛熱傳方式預測房間天花板平均溫度，最後以有限元素分析軟體ANSYS做相關的熱應力分析，發現在天花板高溫區域附近有最大壓應力，而在模擬時間內所造成之最大熱應力階低於混凝土本身的結構強度。

This work mainly includes two parts. The first one is using the Fire Dynamics Simulator (FDS) developed by NIST/BFRL to simulate the transient enclosure fire. The LES (Large eddy simulation) technique in FDS is then validated by comparing the turbulent flow and temperature distribution of the room with the experimental data. The results of simulation are compared with experimental data under different empirical constants. The results show that the predictions of the velocity and temperature distributions near the vent are in good agreement with the experimental data. The second part is focused on the prediction of the ceiling temperature distributions. The boundary conditions of the ceiling are set to be thermally-thick. The temperature distributions are then imported to the finite element software, ANSYS, to evaluate the thermal stresses. The result shows that the greatest compressive stress occurs near the high temperature part of the ceiling. Nevertheless, the simulated thermal stress is below the structure strength of the concrete under the present conditions.

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