摘要
【目的】随着我国装配式建筑结构的推进,多腔钢管混凝土柱在新型钢框架建筑结构体系中得到应用和发展,有必要对多腔钢管混凝土异形柱的耐火性能进行研究。【方法】采用ABAQUS软件建立组合柱受火的有限元模型,验证其准确性,并分析T形和L形组合柱在两种受火工况下的耐火性能,包括温度发展、耐火极限、内力发展及破坏模式。【结果】组合柱的截面形状和受火条件对其截面温度分布影响显著,当受火面减少一半时,T形和L形柱的耐火极限分别提升240.5%和95.8%。【结论】均匀受火条件下T形和L形组合柱的耐火极限相近,而非均匀受火条件下截面形状对柱的耐火性能影响明显,T形柱的耐火极限较L形柱高44.2%。
[Purposes]With the advancement of prefabricated structures in China,the multi-cavity concrete-filled steel tubular(CFST)columns have been applied and developed in new steel frame structure building systems,and it is necessary to study the fire resistance of multi-cavity concrete-filled steel tube(CFST)Special-shaped special-shaped columns.[Methods]A finite element model of composite columns subjected to fire is developed and calibrated in ABAQUS software.The fire performance of Tshaped and L-shaped composite columns under two fire conditions are analyzed,including the temperature development,fire resistance,axial force development,as well as failure modes.[Findings]The cross-sectional type and fire conditions of composite columns have a significant effect on the temperature distribution.When the fire surface is reduced by half,the fire resistance of T-shaped and L-shaped columns increases by 240.5%and 95.8%,respectively.[Conclusions]The fire resistance of T-shaped and L-shaped composite columns under uniform fire is similar.The sectional shape has a significant effect on the fire resistance of columns under non-uniform fire,and the fire resistance of T-shaped column is 44.2%higher than that of L-shaped column.
作者
阚玉婷
KAN Yuting(Shenzhen Pingshan District Construction Works Department,Shenzhen 518000,China)
出处
《河南科技》
2024年第23期64-68,共5页
Henan Science and Technology
