标准升温条件下PEC柱耐火极限理论分析及简化计算  

Theoretic Model and Simplified Calculation Method of Fire Resistance of Partially Encaed Concrete(PEC) Columns

作　　者：毛小勇[1] 徐悦军[1] 行盼娟[1] 

机构地区：[1]苏州科技学院江苏省结构工程重点实验室,江苏苏州215011

出　　处：《防灾减灾工程学报》2012年第1期45-49,共5页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(50708062);江苏省青蓝工程中青年学术带头人项目(2011);苏州市高层次人才项目(2007-16);江苏省研究生科研创新计划项目(2011)资助

摘　　要：基于ABAQUS软件建立了标准升温条件下局部填充混凝土(Partially Encaed Concrete,简称PEC)柱抗火性能分析的有限元模型,计算了火灾下PEC柱的变形曲线及耐火极限,计算结果得到了已有试验数据的验证。利用上述模型分析了截面几何参数、材料物理参数、荷载比及偏心率等因素对耐火极限的影响。在参数分析的基础上,建立了标准升温条件下PEC耐火极限简化计算方法。结果表明:无耐火保护PEC柱的耐火极限一般达不到现有抗火标准的要求;荷栽比、长细比和截面周长是影响PEC柱耐火极限的主要因素;该耐火极限简化计算方法可供工程设计参考。Based on ABAQUS software,3-D finite element model was established to calculate the mechanical performances and fire resistance of PEC columns exposed to standard ISO-834 fire.The calculated deformation curves and fire resistance of PEC columns were validated by the test results.The validated model was then been used to analysis the influence of related factors on fire resistance.Simplified calculation method was established based on the aforementioned parametric study.It can be seen from the research results that fire resistance of PEC columns without any insulation may not meet the demand of current provision. Essential factors related to fire resistance are load ratio,slenderness and circumference of column section.The simplified calculation method suggested in this paper can be used as a reference for fire resistance design of PEC columns.

关 键 词：局部填充混凝土(PEC)柱 耐火极限 有限元模型 参数分析 

分 类 号：TU398[建筑科学—结构工程]