首页|圆中空夹层钢管混凝土叠合短柱轴压受力性能研究

圆中空夹层钢管混凝土叠合短柱轴压受力性能研究

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为研究圆中空夹层钢管混凝土叠合柱的轴压受力性能并提出轴压承载力设计方法,以含中空夹层钢管混凝土率和截面直径为参数,对10个圆中空夹层钢管混凝土叠合短柱进行轴压试验,研究其破坏过程、破坏模态、纵向应变和横向变形系数的发展规律,分析影响轴压刚度、强度系数和延性系数的关键因素.采用ABAQUS软件建立有限元模型,对短柱进行受力全过程分析、接触应力分析和参数分析,进而提出圆中空夹层钢管混凝土叠合短柱轴压承载力的设计方法.研究结果表明:在轴压作用下,各组成部件能够协同变形、共同受力;增大中空夹层钢管混凝土的约束效应系数可提升短柱组合效应,提高钢筋混凝土的配箍特征值可改善短柱的延性;当含中空夹层钢管混凝土率由0.5增大至0.6和0.7时,延性系数提高9.6％和18.7％;当截面直径由220 mm增大至260 mm和300 mm时,轴压刚度提高22.2％和43.8％;在极限荷载作用下,钢筋混凝土达到自身的轴压承载力,中空夹层钢管混凝土分担的内力小于其自身的轴压承载力,二者之间的接触应力可忽略不计;通过引入承载力折减系数而提出的轴压承载力设计方法可以有效预测圆中空夹层钢管混凝土叠合短柱的轴压承载力.
Mechanical performance of circular concrete-encased CFDST stub columns under axial compression
To study the mechanical behavior of circular concrete-encased concrete-filled double-skin steel tube(CFDST)columns under axial compression and propose a design method for calculating the ultimate strength,a total of ten circular concrete-encased CFDST stub columns were tested under axial compression with the CFDST ratio and the sectional diameter as testing variables.The failure process,failure mode,longitudinal strain and transverse deformation coefficient were investigated,and the key parameters affecting the axial stiffness,strength index and ductility index were determined.Then,a finite element model(FEM)was developed.The full-ranged process,the contact stress and the influences of critical parameters were analyzed.Based on the above analysis,the design method for the ultimate strength of the circular concrete-encased CFDST stub column was further proposed.The results show that the circular concrete-encased CFDST stub column can exhibit compatible deformation performance.An increasing confinement factor will improve the composite effect of the specimens.Increasing the characteristic stirrup value will improve the ductility index.When the CFDST ratio increases from 0.5 to 0.6 and 0.7,the ductility index improves by 9.6％and 18.7％,respectively.When the sectional diameter increases from 220 mm to 260 mm and 300 mm,the axial stiffness improves by 22.2％and 43.8％,respectively.At the peak load,the external reinforced concrete(RC)component reaches the corresponding ultimate strength,and the internal load borne by the CFDST component is less than its ultimate strength.The contact stress between the RC component and the CFDST component is negligible.The ultimate strength of the circular concrete-encased CFDST stub column can be effectively predicted by introducing the strength reduction factor.

concrete-encased CFDST columnstatic testfinite element analysisaxial compression behaviordesign methodconfinement factorcharacteristic stirrup value

丁纪楠、王庆贺、任庆新

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沈阳建筑大学 土木工程学院,辽宁沈阳 110168

佛山科学技术学院 交通与土木建筑学院,广东佛山 528225

中空夹层钢管混凝土叠合柱 静力试验 有限元分析 轴压性能 设计方法 约束效应系数 配箍特征值

国家自然科学基金项目辽宁省"兴辽英才计划"项目辽宁省科技厅博士启动项目辽宁省应用基础研究计划

51678373XLYC19020272021-BS-1652022JH2/101300130

2024

10.14006/j.jzjgxb.2022.0346

建筑结构学报
中国建筑学会

建筑结构学报

CSTPCD北大核心
影响因子：1.546
ISSN：1000-6869
年,卷(期)：2024.45(2)
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