Q345钢高温蠕变试验及考虑蠕变后钢柱抗火性能研究

发布时间：2018-03-25 01:09

  本文选题：Q钢　切入点：蠕变试验　出处：《建筑结构学报》2016年11期

【摘要】：采用蠕变试验机对低合金Q345钢进行高温蠕变试验,得到高温下的蠕变曲线。基于试验数据和现有蠕变模型,拟合得到Q345钢复合时间强化蠕变模型和Norton蠕变模型。利用蠕变模型对Q345钢柱的抗火性能进行分析,得到高温下Q345轴压钢柱承载力与受火时间关系曲线以及ISO 834标准升温条件下钢柱的荷载比和临界温度的关系。研究表明:Q345钢在700~800℃断裂前蠕变变形达到最大值;考虑蠕变后钢柱受火初期的承载力随受火时间的延长急剧降低,随后趋于稳定;ISO 834标准升温条件下,荷载比在0.2~0.8内考虑蠕变后钢柱的失效临界温度降低60℃左右。
[Abstract]:The creep curves of low alloy Q345 steel at high temperature were obtained by creep test machine. Based on the experimental data and the existing creep model, the creep curves of Q345 steel at high temperature were obtained. The composite time hardening creep model and Norton creep model of Q345 steel were obtained by fitting. The fire resistance of Q345 steel column was analyzed by creep model. The relationship between bearing capacity and fire time of Q345 steel column at high temperature and the relationship between load ratio and critical temperature of steel column under ISO 834 standard temperature are obtained. The results show that the creep deformation of the steel reaches its maximum value before fracture at 700,800 鈩，

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