In the present study, the structural analysis of a three‐parted steel door during a fire resistance test was examined by FEM simulation. The structural analysis is part of a coupled CFD/FEM simulation approach developed for the prediction of fire resistance tests. The basis of this follow‐up work was the calculated temperature in the test specimen from CFD to predict the thermal stresses, deformation and gap formation between the door parts. The spatial information of the temperature in the test specimen was exported. Subsequently, the thermal expansion of the door and the resulting stresses and gaps were calculated. To validate the FEM simulation, the deformation of the steel door was observed. It was found that the simulation predicted the deformation of the steel door in close accordance to the measurement. The maximum displacement was found in the centre of the construction with 141 mm, whereas the simulation predicted a value of 133 mm. In addition to the deformation of the door, also the prediction of the gap formation was validated against the flue gas leakage. The first flue gas exit occurred already after 120 seconds, which was in spatial and temporal conjunction with the maximum gap predicted in the simulation.

中文翻译：

---

基于CFD / FEM耦合分析的数值有效方法用于虚拟耐火性测试的开发— B部分：钢结构的变形过程

在本研究中，通过有限元模拟研究了三部分钢制门在耐火测试中的结构分析。结构分析是为预测耐火性测试而开发的CFD / FEM耦合模拟方法的一部分。这项后续工作的基础是通过CFD计算出的试样中的温度，以预测门部件之间的热应力，变形和缝隙形成。导出了样品中温度的空间信息。随后，计算了门的热膨胀以及由此产生的应力和间隙。为了验证有限元模拟，观察了钢门的变形。结果发现，模拟结果根据测量值预测了钢门的变形。在结构的中心发现最大位移为141 mm，而模拟预测值为133 mm。除了门的变形之外，还针对烟气泄漏验证了间隙形成的预测。第一次烟气出口已经在120秒后发生，这在空间和时间上与模拟中预测的最大间隙有关。