基于局部屈曲的带螺旋刚度的混凝土填充薄壁方形钢管承载能力分析

Penggang Tian, Zhenshan Wang, Kai Wang, Jianhui Niu, Zhixun Xie, Kangning Liu
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引用次数: 0

摘要

为解决薄壁钢管混凝土柱的局部屈曲问题,提出了一种螺旋加劲肋的形式。对五节方形钢管混凝土柱试件进行了轴向压缩试验。研究表明,与普通钢管混凝土柱相比,采用螺旋加劲肋约束的钢管混凝土柱的轴向压缩承载力和变形承载力分别提高了 18.5%和 7.7%。螺旋肋有效增强了薄壁钢管混凝土构件的抗弯能力。这种新型构件的破坏模式特点是包裹混凝土的斜裂缝与螺旋肋的方向一致,钢管壁的屈曲集中在螺旋加劲肋之间。根据试验结果,对带有螺旋加劲肋约束的薄壁钢管的屈曲性能进行了分析,并将其纳入承载能力计算。试验、模拟和理论计算结果表明,每个试样的复合材料柱的承载能力误差都在 10% 以内。最终,提出了螺旋肋钢管临界屈曲承载力的计算公式。这些研究成果为这种新型构件的工程应用奠定了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of the Bearing Capacity of Concrete-Filled Thin-Walled Square Steel Tubes with Helical Stiffening Based on Local Buckling
To address the issue of local buckling in thin-walled steel tube concrete columns, a form of helical stiffening ribs was proposed. Axial compression tests were conducted on five sections of square steel tube concrete column specimens. The research revealed that, compared to ordinary steel tube concrete columns, the axial compression bearing capacity and deformation capacity of steel tube concrete columns with helical rib constraints increased by 18.5% and 7.7%, respectively. The helical ribs effectively enhanced the buckling resistance of the thin-walled steel tube concrete components. The failure pattern of this new type of component was characterized by diagonal cracks in the encased concrete aligning with the direction of the helical ribs, and the buckling of the steel tube walls was concentrated between the helical stiffening ribs. Based on the experiments, an analysis of the buckling performance of thin-walled steel tubes with helical rib constraints was conducted, and this was incorporated into the bearing capacity calculation. The test, simulation, and theoretical calculations showed that the bearing capacity error of the composite columns for each specimen was within 10%. Ultimately, a formula for the critical buckling bearing capacity of the helical rib steel tubes was proposed. The research findings provide a foundation for the engineering application of this new type of component.
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