为进一步提高普通钢管混凝土叠合柱(简称“OC-CFST柱”)的受压承载力和耐久性,提出一种采用超高性能混凝土外包钢管混凝土叠合柱(简称“UC-CFST柱”),并开展22根(包括9根UC-CFST、9根OC-CFST和4根CFST)短柱试件的轴压试验,研究外包材料强度和面积占比对叠合短柱轴压性能和破坏模式的影响;同时,采用ABAQUS建立UC-CFST短柱的有限元模型,并开展了具有实际结构尺寸的短柱轴压性能有限元参数分析。研究结果表明:OC-CFST短柱破坏时外包层混凝土大面积剥落,而UC-CFST短柱由于UHPC中钢纤维的桥联作用,破坏时UHPC外包层比较完整。相比OC-CFST短柱,UC-CFST短柱的轴压刚度和轴压承载力均有显著提高,且在外包UHPC达到峰值压应变时达到轴压承载力。叠合柱外径不变时,随着外包混凝土面积占比的增加,UC-CFST短柱的轴压承载力近似线性增加,而OC-CFST短柱呈现线性递减趋势。最后,分析了采用现行钢管混凝土叠合柱结构技术规程中的轴压承载力公式计算UC-CFST短柱时的适用性,并在该规范公式的基础上建议不考虑0.9的附加系数,提出了可用于准确计算UC-CFST短柱轴压承载力的计算方法。
Abstract
To enhance the axial compressive bearing capacity and durability of concrete-encased concrete-filled steel tubular columns (referred to as OC-CFST columns), a novel approach utilizing ultra-high performance concrete (UHPC) encased CFST (UC-CFST columns for short) was proposed. A total of 22 stub column specimens were tested under axial compression, including nine UC-CFST columns, nine OC-CFST columns, and four CFST columns.The investigation aimed to assess the impact of encasing material strength and area ratio on the axial compressive performance and failure mode. Finite element models of the UC-CFST stub column were established using ABAQUS, and a parameter analysis of axial compression performance was conducted on the stub columns with real structural dimensions. The results reveal that during failure of OC-CFST stub columns, the encasing ordinary concrete suffers extensive peeling, while UC-CFST stub columns experience relatively intact due to the bridging effect of steel fibers within the UHPC. Compared to the OC-CFST stub columns, the UC-CFST stub columns exhibit significantly improving axial compressive stiffness and axial compressive bearing capacity, and reach axial compressive bearing capacity when the UHPC encasing reaches its peak compressive strain. Furthermore, while maintaining the outer diameter of composite columns constant, the axial compressive bearing capacity of UC-CFST stub columns demonstrate an approximately linear increase with the rise in area ratio of encasing concrete, while the OC-CFST stub columns exhibit a linear decreasing trend. Finally, the applicability of using the formula in the current technical specifications for steel tube-reinforced concrete column structures to calculate the axial compressive bearing capacity of UC-CFST stub columns was analyzed. Based on this formula, it was recommended not to consider the additional coefficient of 0.9 and a new calculation method was proposed to accurately determine the axial compressive bearing capacity of UC-CFST stub columns.
关键词
钢管混凝土叠合柱 /
外包超高性能混凝土 /
轴压试验 /
有限元分析 /
破坏形态 /
轴压承载力
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Key words
concrete-encased CFST composite column /
UHPC-encased /
axial compression test /
finite element analysis /
failure pattern /
axial compressive bearing capacity
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脚注
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基金
国家自然科学基金项目(51978169),福建省科技计划项目(2021H6021),福建省交通运输科技发展计划(202211)。
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