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Research on Fire-Resistance Capacities of Steel Columns with Partial-Damaged Fire Protection Coating
KSCE Journal of Civil Engineering ( IF 2.2 ) Pub Date : 2020-05-08 , DOI: 10.1007/s12205-020-1795-2
Hui Jin , Qing Chun

The protection coating is possible to be damaged during its service life, which may induce a more complicated temperature distribution of columns in fire. In order to find out the fire-resistance capacities of the steel columns with partial-damaged fire protection coating, a detailed study on the effect of partial-damaged fire protection coating on steel columns was conducted with the finite element method. The fire-resistance capacity of I-section steel columns with partial-damaged fire protection coating was studied for the different cases, and the heating condition was the international standard fire curve. It is verified that the partial-damaged fire protection coating can cause local longitudinal non-uniform temperature distribution for the whole column and sectional temperature difference for a segment of the column at the same time. The parametric analysis including the locations of defects on protection coating, the slenderness of columns and the load ratios were considered. The results show that the relatively small areas losses of the protection coating can significantly reduce the fire-resistance capacity of the steel columns. The degradation in fire-resistance capacity is more significant when the losing areas on the upper part of the column, and the cases with high load ratio (≧-0.7) are more sensitive to the negative effect of the losses of the protection coating. The residual fire-resistance capacity of the column decreases with the development of the defect length on the protection coating. The results can provide the basic assessments on fire-resistance capacities of steel columns with partial-damaged fire protection coating.



中文翻译:

局部损伤防火涂层钢柱的耐火性能研究

保护涂层在其使用寿命期间可能会损坏,这可能导致着火的色谱柱温度分布更加复杂。为了找出部分损坏的防火涂层钢柱的耐火能力,采用有限元方法对部分损坏的防火涂层对钢柱的影响进行了详细的研究。研究了不同情况下工字钢截面局部防火涂层的耐火性能,加热条件为国际标准防火曲线。证实了部分损坏的防火涂料会导致整个立柱局部纵向不均匀的温度分布,并同时导致一部分立柱的截面温差。考虑了参数分析,包括保护涂层上缺陷的位置,色谱柱的细长度和负载比。结果表明,保护涂层的面积损失相对较小,可显着降低钢柱的耐火能力。当在柱上部的损失区域时,耐火能力的降低更为显着,并且高负载比(≥-0.7)的情况对保护涂层损失的负面影响更为敏感。柱的剩余耐火能力随着保护涂层上缺陷长度的增加而降低。研究结果可为部分破坏防火涂层的钢柱的抗火能力提供基础评估。

更新日期:2020-05-01
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