Ultimate compressive strength of plate elements with pit corrosion wastage
Ultimate compressive strength of plate elements with pit corrosion wastage
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DOI：
10.1177/147509020321700402
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发表时间：
2003-12
期刊：
影响因子：
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通讯作者：
J K Paik;J M Lee;M. J. Ko
中科院分区：
文献类型：
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作者：
J K Paik;J M Lee;M. J. Ko
本文研究了轴压荷载作用下含点蚀损伤板单元的极限强度特性。对一个不同坑蚀损伤程度的箱形柱型钢板结构进行了倒塌试验。利用ANSYS非线性有限元分析软件，对不同点蚀强度和钢板几何特性的轴向受压钢板进行了非线性有限元分析。本文提出了一个新的参数，即最小截面积，来表示极限强度降低特性，由于局部腐蚀。结果表明，基于参数的方法比传统的基于等效厚度的方法更能准确地预测含孔板的极限强度。通过对试验和数值计算结果的回归分析，推导出了腐蚀结构基于极限状态的风险或可靠性评估所需的孔板极限抗压强度的封闭设计公式。所得结论对含点蚀损伤的电镀结构的损伤容限设计具有重要的指导意义。
The aim of the present paper is to investigate the ultimate strength characteristics of plate elements with pit corrosion wastage under axial compressive loads. Collapse tests on a box column type of steel-plated structures with different degrees of pit corrosion damage are undertaken. A series of ANSYS non-linear finite element analyses for steel plate elements under axial compressive loads are carried out, varying the degree of pit corrosion intensity and plate geometric properties. In this paper, a new parameter, i.e. the smallest cross-sectional area, is proposed to represent the ultimate strength reduction characteristics due to localized corrosion. It is proved that the proposed parameter-based approach is more useful than the traditional approach based on equivalent thickness in terms of the accuracy of ultimate strength predictions of pitted plates. Closed-form design formulae for the ultimate compressive strength of pitted plates, which are needed for the ultimate limit state-based risk or reliability assessment of corroded structures, are derived by regression analysis of the experimental and numerical results obtained from the present study. The insights developed will be very useful for the damage-tolerant design of plated structures with pit corrosion damage.