对拼波形钢板-混凝土异形柱单元轴压稳定性能研究
Study on Axial Compressive Stability Performance of Spliced Corrugated Steel Plate-Concrete Special-Shaped Column Elements
针对现有异形钢管混凝土柱、薄壁钢管混凝土柱在民用建筑应用中存在的不足,文中提出了一种新型对拼波形钢板-混凝土组合异形柱。选取异形柱单元开展轴压试验研究,设计了5个组合柱试件,研究长细比、含钢率对其轴压性能的影响。试验结果表明:组合短柱以混凝土剪切破坏为主,组合长柱易发生波形钢板局部屈曲;随长细比增大,试件轴压稳定承载力显著下降;随含钢率增加,试件轴压极限承载力稳步提高。采用ABAQUS有限元软件,建立并验证组合柱有限元模型,进一步开展参数化分析。数值模拟结果表明:增大外侧波形钢板厚度可以提高组合柱的轴压稳定承载力,但会降低其延性;当波谷宽度达到330 mm时,钢板厚度增加对混凝土的约束作用显著增强;当波谷宽度低于330 mm时,钢板厚度对混凝土约束作用影响有限。此外,当波谷宽度为330 mm时,随着长细比增大,组合柱的轴压稳定承载力下降速率显著加快。结合试验与数值模拟结果,推导该组合柱的轴压稳定承载力计算公式,计算结果与试验、模拟值吻合较好,验证了公式的合理性与准确性,为该类组合异形柱的工程应用提供理论支撑。
To address the issues of existing special-shaped concrete-filled steel tubular columns and thin-walled concrete-filled steel tubular columns in civil buildings, a novel spliced corrugated steel plate-concrete composite special-shaped column was proposed. Five composite column specimens were designed for axial compression tests to study the effects of slenderness ratio and steel ratio on their axial compressive behavior. The tests showed that the composite short columns primarily exhibited concrete shear failure, and the corrugated steel plates of the medium-long columns were susceptible to local buckling. A The axial compressive capacity decreased significantly with the slenderness ratio, whereas the ultimate axial compressive capacity increased steadily with the steel ratio. A finite element model of the composite column was established and validated using ABAQUS, followed by a parametric analysis. The numerical results indicated that increasing the outer corrugated steel plate thickness improved the axial compressive stability capacity but reduced ductility. When the trough width was 330 mm, the steel plates provided significantly enhanced confinement to the concrete as the plate thickness increased. When the trough width was less than 330 mm, the plate thickness had little effect on concrete confinement. Also, at a trough width of 330 mm, the axial compressive stability capacity decreased more rapidly as the slenderness ratio increased. Based on the test and numerical results, a calculation formula for axial compressive stability capacity was derived. The calculated results agreed well with the test and numerical results, validating the rationality and accuracy of the formula and providing theoretical support for the practical application of this composite special-shaped column.
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国家自然科学基金(52308516)
苏州市科技计划项目(SJC2023002)
江苏高校基础科学研究项目(21KJB560008)
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