火灾下蜂窝钢梁腹板屈曲性能研究

发布时间：2018-04-14 15:42

  本文选题：蜂窝钢梁 + 无防火保护　； 参考：《建筑钢结构进展》2016年06期

【摘要】：通过有限元方法研究火灾下无防火保护蜂窝钢梁孔间腹板屈曲性能及屈曲温度。首先采用有限元传热分析,获得标准火灾下无防火保护蜂窝梁不同受火时刻的三维有限元温度分析结果,然后采用有限元受力分析确定三维有限元温度分析结果下蜂窝梁孔间腹板的受力性能和屈曲温度。传热分布结果表明,开孔后增加了孔洞周边厚度方向上腹板与空气间的热量交换,使得腹板升温速率明显大于翼缘。火灾下结构受力分析结果表明,由于钢材的力学性能随温度升高而降低,而且中心腹板升温速率快使蜂窝梁更易发生孔间腹板屈曲破坏。蜂窝梁的屈曲温度随孔间距及腹板厚度的增大而增大。通过对采用三维有限元温度分布与均匀温度分布的蜂窝梁进行对比分析,结果表明,由于不均匀温度分布使得沿腹板高度产生附加热应力,从而使得孔间腹板屈曲变形增大。
[Abstract]:The buckling behavior and buckling temperature of web between holes of honeycomb steel beams without fire protection were studied by finite element method.Firstly, the finite element heat transfer analysis is used to obtain the results of 3-D finite element temperature analysis of honeycomb beams without fire protection under standard fire.Then the finite element stress analysis is used to determine the behavior and buckling temperature of the web between the honeycomb beams under the three dimensional finite element temperature analysis.The results of heat transfer distribution show that the heat exchange between the upper web and the air in the direction of the thickness of the hole is increased after opening, and the heating rate of the web is obviously larger than that of the flange.The results of structural stress analysis under fire show that the mechanical properties of steel decrease with the increase of temperature and the rapid heating rate of the central web makes it easier for the beehive beams to be subjected to interhole web buckling failure.The buckling temperature of honeycomb beams increases with the increase of hole spacing and web thickness.By comparing the three-dimensional finite element temperature distribution with the uniform temperature distribution of honeycomb beams, the results show that the additional thermal stress is produced along the web height due to the uneven temperature distribution, and the buckling deformation of the web between the holes increases.
【作者单位】： 山东省建筑设计研究院;山东大学土建与水利学院;保利(青岛)实业有限公司;
【分类号】：TU391
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本文编号：1749991