| 圆端形钢管混凝土中长柱轴压性能 |
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| 引用本文： | 任志刚,张 铭,魏 巍,王丹丹.圆端形钢管混凝土中长柱轴压性能[J].建筑科学与工程学报,2020,0(3):18-27. |
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| 作者姓名： | 任志刚 张 铭 魏 巍 王丹丹 |
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| 作者单位： | (武汉理工大学 土木工程与建筑学院,湖北 武汉 430070) |
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| 摘 要： | 为研究圆端形钢管混凝土中长柱的轴压性能,考虑了构件千分之一杆长的初弯曲,使用有限元软件ABAQUS建立了圆端形钢管混凝土中长柱精细化有限元分析模型,利用已有试验数据验证有限元模型的合理性与精确性,在此基础上分析了试件的变形模式和承载能力状态,比较短柱、中长柱与长柱性能的不同,得出了圆端形钢管混凝土界限长细比。综合分析了长细比、钢管厚度、混凝土强度、钢材强度、高宽比等参数,提出了圆端形钢管混凝土中长柱极限承载力简化计算公式,并对简化计算公式的准确性进行了验证。结果表明:短柱为强度破坏,中长柱发生弹塑性失稳破坏,长柱发生弹性失稳破坏; 在其他条件相同的情况下,圆端形钢管混凝土中长柱的极限承载力、延性与长细比呈负相关,与钢材强度、钢管厚度呈正相关,混凝土强度的变化对承载力和延性的影响不大; 短柱与中长柱界限长细比λ0=10～11,中长柱与长柱界限长细比λp=86.4～96.0; 与试验数据及有限元计算结果相比,承载力公式具有足够精度,可为圆端形钢管混凝土中长柱研究与工程应用提供理论依据。
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| 关 键 词： | 圆端形钢管混凝土 轴压性能 界限长细比 承载力 中长柱 |
Axial Compression Performance of RCFST Middle Long Columns |
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| REN Zhi-gang,ZHANG Ming,WEI Wei,WANG Dan-dan.Axial Compression Performance of RCFST Middle Long Columns[J].Journal of Architecture and Civil Engineering,2020,0(3):18-27. |
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| Authors: | REN Zhi-gang ZHANG Ming WEI Wei WANG Dan-dan |
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| Affiliation: | (School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China) |
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| Abstract: | In order to study the axial compression performance of the round-ended concrete-filled steel tube(RCFST)middle long columns, a finite element model of RCFST middle long columns under axial load was developed by using ABAQUS. On the basis of verifying the rationality and accuracy of the finite element model by the existing experimental data, the deformation and the bearing capacity states of the specimens were analyzed, and the properties of short columns, middle long columns and long columns were compared, the boundary slenderness ratio of RCFST was proposed. A simplified formula for calculating ultimate bearing capacity of RCFST middle long columns was presented based on the analysis of the parameters such as the slenderness radio, thickness of the steel pipe, concrete strength, steel strength and height to width aspect ratio, and the accuracy of simplified formula was verified. The results show that the short column is strength failure, the middle long column is buckling failure and the long column is elastic instability failure. Under the same conditions, the slenderness ratio has negative relation as well the steel strength and thickness of steel pipes have positive relation with the ultimate bearing capacity and ductility of RCFST middle long column under axial load, but the variation of concrete strength has less influence on ultimate bearing capacity and ductility. The bounds slenderness ratio among stub columns, middle long columns and long columns are λ0=10-11 and λp=86.4-96.0 respectively; the formula for calculating axial load bearing capacity has sufficient accuracy comparing with the results of finite element analysis and experiment, and it can provide theoretical basis for the research and engineering application of RCFST middle long columns. |
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| Keywords: | RCFST axial compression performance bounds slenderness ratio bearing capacity middle long column |
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