标准升温下PEC柱的耐火极限分析

An Analysis on Fire Resistance Limit of PEC Columns under Standard Warming Conditions

确定了高温下钢材和混凝土的热工参数和应力-应变关系模型,建立了标准升温条件下局部填充混凝土(Partial Encaed Concrete,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。计算结果经已有试验数据的验证,吻合较好。分析表明,无耐火保护PEC柱的耐火极限小于现有抗火标准的要求,分析模型可为进一步研究PEC的抗火性能及设计方法提供参考。

The thermal properties and the stress-strain relations of the steel and concrete under the high temperature were determined.A finite element model was made to analyze the fire resistance performances of PEC columns under the standard warming conditions,and the deformation curves and fire resistance limit of PEC columns under the fire were calculated.The results show that the fire resistance limit of PEC columns without any insulation may not meet the demand of the current fire resistance standard.The model can be of some reference for further investigation on the fire behavior and design of PEC columns.