Abstract This paper presents the results of the experimental and finite element study that was performed to analyze the buckling behavior of corroded cold-formed steel beam-columns. Six specimens with different corrosion degrees were tested under compression and major axis bending. The residual thickness distribution and the mechanical properties of the corroded specimens were analyzed. A nonlinear finite element model predicting the buckling behavior of corroded cold-formed steel beam-columns was proposed. Finally, the influence of the parameters on ultimate load and failure mode were discussed, and the parameters include the parts, locations and lengths of the corroded region. The results indicated that when the thickness loss ratio was below 0.467, the decrease of the corrosion reduction factor for the elastic modulus was small, and then accelerated obviously. The corrosion reduction factor for the yield strength decreased linearly as the thickness loss ratio increased. Local buckling of the web of the corroded specimens was easier to occur than the web of the non-corroded specimen. The corrosion reduction factor for the ultimate load mainly depended on the minimum thickness of the cross-section. The flange corrosion most significantly affected the bearing capacity of the cold-formed steel beam-columns with localized corrosion. The locations and length of the corroded region has a little effect on the ultimate load and failure mode of corroded cold-formed steel beam-columns.

中文翻译：

---

冷弯型钢梁柱受压长轴弯曲腐蚀试验研究

摘要 本文介绍了为分析腐蚀的冷弯型钢梁柱的屈曲行为而进行的实验和有限元研究的结果。在压缩和长轴弯曲下测试了六个不同腐蚀程度的试样。分析了腐蚀试样的残余厚度分布和力学性能。提出了一种预测腐蚀冷弯型钢梁柱屈曲行为的非线性有限元模型。最后讨论了参数对极限载荷和破坏模式的影响，参数包括腐蚀区域的部位、位置和长度。结果表明，当厚度损失比小于0.467时，腐蚀折减系数对弹性模量的下降幅度较小，然后明显加速。随着厚度损失率的增加，屈服强度的腐蚀减少因子线性下降。腐蚀试样的腹板比未腐蚀试样的腹板更容易发生局部屈曲。极限载荷的腐蚀减少系数主要取决于横截面的最小厚度。翼缘腐蚀对局部腐蚀冷弯型钢梁柱的承载力影响最为显着。腐蚀区域的位置和长度对腐蚀冷弯型钢梁柱的极限荷载和破坏模式影响不大。腐蚀试样的腹板比未腐蚀试样的腹板更容易发生局部屈曲。极限载荷的腐蚀减少系数主要取决于横截面的最小厚度。翼缘腐蚀对局部腐蚀冷弯型钢梁柱的承载力影响最为显着。腐蚀区域的位置和长度对腐蚀冷弯型钢梁柱的极限荷载和破坏模式影响不大。腐蚀试样的腹板比未腐蚀试样的腹板更容易发生局部屈曲。极限载荷的腐蚀减少系数主要取决于横截面的最小厚度。翼缘腐蚀对局部腐蚀冷弯型钢梁柱的承载力影响最为显着。腐蚀区域的位置和长度对腐蚀冷弯型钢梁柱的极限荷载和破坏模式影响不大。