随机点锈蚀下圆形钢管轴压承载能力
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作者:
作者单位:

1.东南大学 土木工程学院,江苏 南京 211189;2.辽宁工程技术大学 土木工程学院,辽宁 阜新 123000

作者简介:

赵中伟(1986—),男,副教授,工学博士,主要研究方向为既有钢结构性能评估。 E-mail:zhaozhongwei@lntu.edu.cn

通讯作者:

吴 刚(1976—),男,教授,博士生导师,工学博士,主要研究方向为既有工程结构高效加固新技术。 E-mail:g.wu@seu.edu.cn

中图分类号:

TU391

基金项目:

国家重点研发计划(2020YFC1511900);江苏省博士后科研资助计划(2020Z356)


Axial Bearing Capacity of Circular Steel Pipes with Random Pitting Corrosion
Author:
Affiliation:

1.School of Civil Engineering, Southeast University, Nanjing 211189, China;2.School of Civil Engineering, Liaoning Technical University, Fuxin 123000, China

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    摘要:

    针对随机点锈蚀对圆形钢管轴压承载能力的影响,以质量损失率为因变量,研究轴压承载力在随机点锈蚀影响下随质量损失率的变化规律。通过引入轴压承载力折减系数,揭示了锈蚀深度、锈蚀坑平面尺寸、钢材等级以及钢管壁厚对折减系数的影响规律。在大量随机有限元分析的基础上,提出了折减系数的理论计算公式。该公式可根据质量损失率精确预测钢管在随机点锈蚀影响下钢管轴压承载力的折减系数。

    Abstract:

    In view of the effect of random pitting corrosion on axial bearing capacity of circular steel pipes, the changing rule of bearing capacity was revealed along with the mass loss ratio. A reduction factor was introduced to investigate the effect of corrosion thickness, pitting size, steel grade and wall thickness of steel pipes. The analytical formula for predicting the reduction factor was proposed. This formula can exactly predict the reduction factor of corroded steel pipes which is affected by random pitting corrosion.

    图1 锈蚀坑的不同形状Fig.1 Shapes of corrosion pit
    图2 随机点锈蚀钢管数值模型Fig.2 Numerical model of steel pipe with random pitting corrosion
    图3 试件示意图(单位:mm)Fig.3 Schematic diagram of test specimens(unit:mm)
    图4 试件照片Fig.4 Photo of test specimens
    图5 试验结果Fig.5 Test results
    图6 破坏模式Fig.6 Failure mode
    图7 均匀锈蚀下Rc‒χ曲线Fig.7 Curves of Rc‒χ corresponding to uniform corrosion
    图8 理论结果与有限元结果对比Fig.8 Comparison between analytical and FE results
    图9 随机锈蚀下Rc‒χ曲线Fig.9 Curves of Rc‒χ corresponding to random corrosion
    图10 Wc对Rc‒χ曲线的影响Fig.10 Effect of Wc on Rc‒χ curves
    图11 fy对Rc‒χ曲线的影响Fig.11 Effect of fy on Rc‒χ curves
    图12 D/t对Rc‒χ曲线的影响Fig.12 Effect of D/t on Rc‒χ curves
    图13 薄壁钢管失效(t=1 mm)Fig.13 Failure of thin-walled steel pipe (t=1 mm)
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赵中伟,张宏伟,吴刚.随机点锈蚀下圆形钢管轴压承载能力[J].同济大学学报(自然科学版),2021,49(2):188~194

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  • 收稿日期:2020-06-23
  • 在线发布日期: 2021-03-18
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