摘要
本文介绍了火灾下非均匀受火钢柱截面温度分布规律及其对钢柱抗火性能的研究进展和已有研究成果,包括钢柱截面非均匀温度分布产生的原因及截面温度非均匀分布对钢柱抗火性能的影响。钢柱截面不均匀温度产生的原因有:钢柱受到建筑填充墙保护,非4面受火;钢柱仅部分截面采用防火保护;受洞口非均匀火灾影响的建筑外框架柱;钢柱防火保护层不均匀或局部破损等。截面温度不均匀对钢柱抗火性能的影响包括:截面产生附加应力,使钢柱临界温度降低;钢柱截面不对称,发生弯扭破坏;钢柱产生热弯曲,以及破坏时可能出现的反向弯曲等。并对需要进一步研究的问题给出了建议。
A literature review and main progress on temperature distribution of non uniformly heated framed steel column is presented. The main focuses of the literature review are the temperature distribution of framed steel column in fire, and its influences on the fire-resistant capability of steel columns. The reasons of non-uniformly temperature distributions are as follows： framed steel colums are protected by partition walls; or steel colums are web infilled or partly fire protected; exterior steel frames heated by window fire; broken of fire protection layers. The influences on fire resistant are as following： additional thermal stress in the section decreases critical temperature; steel columns fall by lateral torsional buckling; thermal bowing due to temperature gradient. The key problems on fire-resistance design of steel columns with non-uniform temperature distribution needing further research are pointed out.
出处
《建筑钢结构进展》
2011年第4期24-30,56,共8页
Progress in Steel Building Structures
基金
土木工程防灾国家重点试验室开放课题基金(SLDRCE08-TS-02)
关键词
非均匀受火
温度场分布
框架柱
抗火性能
non uniformly heated
temperature distribution
framed steel column
fire resistant capability
