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内配型钢的圆钢管混凝土轴压构件的耐火性能

DOI: 10.13577/j.jnd.2015.0207, PP. 52-59

Keywords: 内配型钢的圆钢管混凝土,轴压构件,耐火性能,接触应力,参数分析

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Abstract:

在钢管混凝土构件中内置型钢可有效提高整个构件的承载力和耐火性能.采用ABAQUS软件建立了标准火灾下内配型钢的圆钢管混凝土轴压构件的热力耦合数值模型,并与已有研究者完成的试验数据进行了对比验证;在此基础上,计算了火灾作用下该类构件柱顶轴向位移和跨中挠度随升温时间变化的关系曲线,根据破坏特征可以分为升温初期膨胀阶段、轴向压缩阶段和破坏阶段,并确定了该类构件的耐火极限;最后计算了火灾作用下每个组件间的相互作用力和参数分析.结果表明:随着温度的升高,钢管与混凝土、混凝土与型钢之间的接触应力呈降低趋势;火灾荷载比、长细比、钢管含钢率及防火保护层厚度对构件耐火极限影响较为显著.

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