生土窑居通风系统改造对结构性能影响

Effect on Structural Performance in the Ventilation System Transformation Technology to the Raw Kiln

为了改善生土窑居窑室潮湿墙面发霉现象,在窑室进深方向拱顶开凿垂直通风孔。生土窑居通风系统改造必定影响其自支撑结构体系受力,为了定量分析其影响程度,利用ANSYS数值分析软件建立模型,采用有限单元法分析比较了不设通风孔和设置直径160 mm、200 mm、240 mm、250 mm、280 mm和315 mm通风孔对窑居结构受力的影响。研究表明,剪切破坏是生土窑居土体发生破坏的主要原因;窑腿是支撑上部土体结构的主要受力构件,但通风孔的设置对窑腿受力影响很小,可以忽略;通风孔附近出现应力集中,通风孔直径在160~240 mm变化时,应力集中现象明显增大,通风孔直径大于240 mm时,应力集中现象趋于稳定。

In order to improve the kiln wetly and mildewy metope phenomenon,a vertical shaft was dug in depth direction of kiln vault. Pit furnace ventilation system will surely affect the self-supporting structure stress.In order to quantitatively analyze its effect,numerical analysis software ANSYS is used to establish the numerical model. Finite element analysis compares the mechanical performance of kiln without vents and the ones respectively with a diameter of 160 mm,200 mm,240 mm,250 mm,280 mm and 315 mm. Analysis result shows that shear failure is the mail failure mode of the soil pit furnace;Kiln leg to support the upper structure of soil is the main structural components,but setting of the vent has a minor effect on the stress of the kiln leg. Stress concentration occurred at the neighborhood of the vent. For vents with a diameter from 160 mm to 240 mm,stress concentration phenomenon becomes apparent. For vent with a hole diameter larger than 240 mm,the stress concentration phenomenon tends to be stable.