内配型钢圆钢管混凝土轴压短柱在不同含钢率下承载力分析  

ANALYSIS ON AXIAL COMPRESSIVE BEARING CAPACITY OF CIRCULAR CONCRETE-FILLED STEEL TUBULAR STUB COLUMNS WITH INTERNAL PROFILED STEEL UNDER DIFFERENT STEEL RATIO

作　　者：毛文婧[1] 史艳莉[1] 王文达[1] 

机构地区：[1]兰州理工大学甘肃土木工程防灾减灾重点实验室,甘肃兰州730050

出　　处：《工程力学》2017年第B06期63-70,共8页Engineering Mechanics

基　　金：国家自然科学基金项目(51468037);甘肃省委组织部"陇原青年创新人才扶持计划"项目

摘　　要：利用ABAQUS有限元软件建立了内配型钢钢管混凝土轴压短柱构件有限元模型,通过有关研究者的试验结果验证了有限元模型的可靠性。以保证钢材总含钢率不变为基本条件,对钢管和内配型钢进行分配,研究和分析该构件的受力机理和力学性能,计算了各组件的承载力分配曲线、轴压应力-应变全过程曲线以及接触应力,并与钢管混凝土构件进行了对比。对不同总含钢量下钢管含钢率分配对承载力的影响规律进行了计算,通过定义承载力提高因子Idex Nc和承载力提高指数Idex Ns等评价指标,对内配型钢钢管混凝土构件的承载力进行了定量分析。结果表明,将总钢材进行分配得到的内配型钢钢管混凝土构件的承载力略低于全部钢材在外部的钢管混凝土构件,钢管含钢率是影响该类组合构件承载力的主要因素。为了使该构件的承载力发挥最优,外钢管含钢率不应低于总含钢率的60%。This paper presents a finite element （FE） model of concrete filled steel tubular （CFST） stub columns with internal profiled steel under axial compressive load using ABAQUS. The FE model was verified by experimental results in the literature. The mechanical behavior of CFST stub columns with internal profiled steel was analyzed by dividing the total sectional steel into steel tube and the internal profiled steel. The load distribution between different components of the column and the axial compressive stress-strain curves were calculated and compared with those of the CFST columns without internal profiled steel. The influence on load-bearing capacity of the steel ratios in the steel tube and internal steel under the same total steel ratio was investigated, and quantitative analyses were conducted by amplification factor IdexNc of load-bearing capacity and amplification index IdexNs of load-bearing capacity of CFST stub columns with internal profiled steel. The load-bearing capacity of CFST stub columns with internal profiled steel is lower than CFST columns without internal steel in general, and the ratio of steel tube is a factor that significantly influences the load-bearing capacity. The results show that the ratio of the outer steel tube should be no less than 60% of the total steel ratio.

关 键 词：内配型钢钢管混凝土 轴压短柱 含钢率 极限承载力 约束效应系数 

分 类 号：TU398.9[建筑科学—结构工程]