Abstract Locally pitted tubular members are usually considered as stub columns to assess the ultimate strength. However, it is not suitable for those with relatively larger slenderness ratios as their failure behavior is more complex and closely related to corrosion features of localized pitting. This paper presents compressive column tests on locally pitted tubular members of a moderate slenderness ratio. Corrosion pits were artificially introduced on local surface of the members, forming corrosion patches with various corrosion features. A numerical modelling method was proposed to reproduce the test specimens. Localized pitting damage was proven to cause substantial declines in the load deformation capacity and ultimate strength, and have a significant effect on the failure mode. The failure of a pitted member is mostly initiated by local buckling after yielding occurs in the corrosion patch, concurrent with pitting closure, and even shear cracking of member wall due to the perforated pits. Moreover, shape change of the corrosion patch most likely results in the failure mode to alter from column buckling to local buckling or interactive buckling. The shape ratio of the corrosion patch is one of the critical factor to influence the ultimate strength of locally pitted members. The proposed modelling method is applicable for extensive stochastic simulations so as to develop an empirical formula and to clarify the probabilistic characteristics of ultimate strength.

中文翻译：

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局部点蚀对管件压缩性能影响的实验和数值研究

摘要 局部有凹坑的管状构件通常被视为评估极限强度的短柱。但不适合长细比相对较大的情况，因为它们的失效行为更为复杂，且与局部点蚀的腐蚀特征密切相关。本文介绍了对中等长细比的局部有凹坑的管状构件的压缩柱试验。在构件局部表面人工引入腐蚀坑，形成具有多种腐蚀特征的腐蚀斑块。提出了一种数值建模方法来重现测试样本。局部点蚀损伤被证明会导致载荷变形能力和极限强度大幅下降，并对失效模式产生显着影响。点蚀构件的失效多由腐蚀斑块发生屈服后的局部屈曲引发，同时伴随点蚀闭合，甚至孔洞导致构件壁发生剪切开裂。此外，腐蚀斑块的形状变化很可能导致失效模式从柱屈曲变为局部屈曲或交互屈曲。腐蚀斑块的形状比是影响局部点蚀构件极限强度的关键因素之一。所提出的建模方法适用于广泛的随机模拟，以开发经验公式并阐明极限强度的概率特征。腐蚀斑块的形状变化最有可能导致失效模式从柱屈曲变为局部屈曲或交互屈曲。腐蚀斑块的形状比是影响局部点蚀构件极限强度的关键因素之一。所提出的建模方法适用于广泛的随机模拟，以开发经验公式并阐明极限强度的概率特征。腐蚀斑块的形状变化最有可能导致失效模式从柱屈曲变为局部屈曲或交互屈曲。腐蚀斑块的形状比是影响局部点蚀构件极限强度的关键因素之一。所提出的建模方法适用于广泛的随机模拟，以开发经验公式并阐明极限强度的概率特征。