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冷弯薄壁矩形管板组相关屈曲压弯承载力研究
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Research on Compression-bending Capacity of Cold-formed Thin-walled Rectangular Tube Considering Interactive Buckling of Plate Group
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    摘要:

    冷弯薄壁矩形钢管柱易发生局部屈曲破坏. 为了研究冷弯薄壁矩形钢管柱的压弯承载性能,建立并验证了冷弯薄壁矩形钢管柱非线性有限元模型. 采用上述模型对不同轴压比、翼缘宽厚比及腹板宽厚比的884个受常轴压力、变水平力作用的矩形钢管柱进行参数分析,研究了构件承载极限状态的截面破坏形式和抗弯承载力. 结果表明:冷弯薄壁矩形钢管柱绕强轴压弯过程主要出现两种破坏模式,比如:全截面屈服和受压翼缘与腹板屈曲. 结合极限状态的应力分布特征,基于有效塑性宽度法提出了考虑板组相关屈曲的冷弯薄壁矩形钢管柱的极限抗弯承载力计算公式,其预测值与有限元模拟结果吻合良好.

    Abstract:

    Cold-formed thin-walled rectangular steel tube columns are prone to local buckling failure. In order to study the compression-bending capacity of cold-formed thin-walled rectangular steel tube columns, a nonlinear finite element model of cold-formed thin-walled rectangular steel tube columns was established and verified. This model is used to simulate 884 rectangular steel tube columns with different axial compression ratios, flange width-thickness ratios, and web width-thickness ratios under constant axial pressure and variable horizontal forces, and the failure mode and flexural capacity in the ultimate limit states are examined. The results show that there are mainly two failure modes in the compression-bending process of cold-formed thin-walled rectangular steel tube columns in the strong axial: full-section yield, and compression flange and web buckling. Combined with the stress distribution characteristics of the limit state,a calculation formula for the ultimate flexural capacity of cold-formed thin-walled rectangular steel tube columns considering the relative buckling of the plate group is proposed based on the plastic effective width method. The predicted value is in good agreement with the finite element simulation results.

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邓露?覮,龙砺芝,刘艳芝,何钰龙.冷弯薄壁矩形管板组相关屈曲压弯承载力研究[J].湖南大学学报:自然科学版,2021,(11):82~90

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  • 在线发布日期: 2021-11-24
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