Studies on Behaviour of Steel Tubular Compression Members Subjected to Accelerated Corrosion
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The performance of steel structural components is strongly influenced by the damage due to atmospheric corrosion, whose control is a key aspect for design and maintenance of both new and existing structures. In extreme situations, it can lead to catastrophic failure of structural components. This paper presents experimental and numerical studies on corroded compression members under stressed and unstressed conditions. Experimental studies are carried out on corroded members with different percentage in thickness and weight loss. A methodology has been developed numerically to simulate three types of corrosion cases by using finite element method, namely (1) uniform corrosion, (2) pitting corrosion and (3) uniform and pitting corrosion. The failure modes and the ultimate load carrying capacity of the specimen are determined numerically and validated with experimental results. A significant reduction in load carrying capacity is observed for all corroded specimens compared to uncorroded control specimen. The failure modes and load carrying capacity of corroded members for uniform, pitting and combined effect of uniform and pitting corrosion are discussed. In the light of experimental results, it is inferred that the failure of the members is due to localised axisymmetric imperfections induced in the tubular members due to corrosion.
KeywordsCorrosion Compression member Uniform corrosion Pitting corrosion Imperfections introduction
This paper is published with the permission of the Director, CSIR-Structural Engineering Research Centre, Chennai, India.
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