作　　者： (王微微）; (任卿举）; (吕学涛）; (米振伟）;

机构地区： 辽宁工程技术大学土木工程学院,阜新123000

出　　处： 《火灾科学》 2017年第2期100-106,共7页

摘　　要： 利用ABAQUS软件建立了火灾下圆钢管约束钢筋混凝土轴压短柱非线性有限元模型,在确定混凝土和钢材的本构基础上,对其火灾下轴压性能进行了数值计算,并与已有相关试验数据进行了对比验证。分析了环境温度、混凝土强度、钢管屈服强度、截面尺寸、含钢率等参数对火灾下轴压性能的影响规律。结果表明:火灾下各试件核心混凝土纵向应力发展规律较为相似,且应力分布趋向均匀;环境温度对试件轴压刚度的影响大于极限承载力,材料强度对极限承载力的影响较大,增大钢管含钢率可一定程度提高试件轴压刚度;提出了火灾下此类试件极限承载力和轴压刚度的简化计算公式,可为工程实际应用提供参考。 To study the axial compression performance of circular tubed reinforced concrete（ CTRC） stub columns under fire,a finite element（ FE） model is established with the software ABAQUS by determining the thermal and mechanical properties of materials. The reliability of the FE model is validated by agreement between the theoretical results and the experimental data. The axial compression performance of the CTRC columns is analyzed based on the FE model,and the parameters investigated include high temperature,concrete strength,steel strength,diameter of cross section and steel ratio. The study reveals that with the increase of temperature,the stress distribution is similar and becomes more uniform. Compared to residual capacity,the temperature has great influence on the axial stiffness of specimens. The material strength has noticeable influence on the residual capacity,and increasing steel ratio can raise the axial stiffness. Simplified formulas are proposed for predicting the evaluating indicators of CTRC columns under fire,which may be a reference for this kind of columns used in practical engineering.

关 键 词： 火灾 圆钢管约束钢筋混凝土 短柱 轴压性能