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高强钢管混凝土柱的抗火性能研究 被引量:10

Fire Resistance of Concrete-Filled High Strength Steel Tubular Columns
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摘要 为了充分研究高强度结构钢(Q460和Q690)钢管内充混凝土柱的抗火性能,建立了恒定轴向荷载作用下的钢管混凝土柱的三维有限元模型。在模型中,对混凝土-钢管界面行为进行了模拟,考虑了柱子的初始几何缺陷,进行了数值热传导和非线性应力分析。通过和已有试验结果的对比,验证了有限元模型的准确性,随后对钢管混凝土柱的抗火性能进行了广泛的参数研究。研究参数包括柱的几何尺寸、钢管材料强度、混凝土强度、混凝土所用水泥类别、混凝土含水率以及加载比例。对柱子的时间-温度和时间-轴向位移曲线进行了分析比较。参数分析结果表明,混凝土的直径和强度对钢管混凝土柱的耐火时间比钢管强度有更大的影响。在同一加载比例下,钢管混凝土柱的耐火时间一般随钢管强度的增加而减少,随着混凝土强度的增加而增加。但在相同荷载下,随着钢管强度等级的提高,钢管混凝土柱的耐火性显著改善。 The main objective of this study is to investigate the effects of high strength steel(Q460 and Q690)on the fire resistance of concrete-filled steel tubular(CFST)columns under constant axial load through finite element analysis.A 3 Dfinite element model is developed to carry out both numerical heat transfer and nonlinear stress analyses.The concrete-steel interface model is considered in the finite element model.The initial geometric imperfections of the columns are also included in the finite element model.The results obtained from the finite element analysis have been verified against experimental results,and it shows that the finite element model can accurately predict fire resistance of the CFST columns,which can be used for further parametric study.Furthermore,an extensive parametric study is performed to investigate the behavior and strength of concrete-filled steel tubular(CFST)circular columns.The parameters included column dimensions,steel strength,concrete strength,loading ratio,different types of cement and moisture contents of concrete.The column time-temperature and time-axial shortening curves are evaluated.It shows that the diameter and strength of concrete have a relatively larger infiuence than that of steel to the fire resistance of CFST columns.At the same loading ratio,the fire resistance generally decreases with the increase of steel strength,and increases with the decrease of concrete strength.However,under the same load,the fire resistance of CFST columns with a higher yield strength onsteel tube shows significant improvement than those of tubes with a lower yield strength.
作者 张哲 王柯 张猛 ZHANG Zhe;WANG Ke;ZHANG Meng(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,Shenzhen University,Shenzhen 518060,China)
出处 《建筑钢结构进展》 CSCD 北大核心 2018年第4期85-96,共12页 Progress in Steel Building Structures
关键词 高强度钢 抗火性能 钢管混凝土柱 高温性能 有限元模型 high strength steel fire resistance concrete-filled steel tubular column high temperature behavior finite elementmodel
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