Compressive strength of tubular members with localized pitting damage considering variation of corrosion features. (September 2020)

• Record Type: Journal Article
• Authors: Wang, Renhua; Guo, Haichao; Shenoi, R.Ajit
• Is Part Of: Marine structures. Volume 73(2020)
• Publication Date: 2020-09
• Subjects: Tubular member -- Localized pitting damage -- Stochastic simulation -- Ultimate strength -- Shape effect; Naval architecture -- Periodicals; Offshore structures -- Periodicals; Architecture navale -- Périodiques; Structures offshore -- Périodiques; Naval architecture; Offshore structures; Periodicals; 620.4162
• DOI: 10.1016/j.marstruc.2020.102805
• Languages: English
• ISSNs: 0951-8339

Abstract

Abstract: Localized pitting corrosion often occurs on marine and offshore structures in the form of patch corrosion with great uncertainties in the location, size and shape. The variation of corrosion features affects ultimate strength of tubular members significantly, but it is still not well understood. This paper presents a numerical study on tubular members of diverse slenderness ratios to clarify the localized pitting effect on ultimate strength. Numerical analyses were performed based on novel models of pitted members that were calibrated against benchmark column tests. Corrosion pits were randomly introduced on the local outside surfaces of members via stochastic simulation, forming corrosion patches varied in the location, size and shape. Numerical results obtained were regressed to propose a unified empirical formula to predict ultimate strength. It turned out that the shape of the corrosion patch has a significant influence on the ultimate strength. The shape change of the patch can alter failure modes of medium length columns. The reduction of ultimate strength is closely related to the shape ratio of the patch besides the volume loss of corroded material. The unified empirical formula incorporating the shape ratio and the volume loss shows a good ability to predict the experimental results. Highlights: A numerical study was performed to clarify localized pitting effect on compressive strength of tubular members. Variation of corrosion features was considered in determining the compressive strength of tubular members. Shape ratio of the corrosion patch affects the ultimate strength and structural behavior of tubular members significantly. A unified empirical formula was proposed for ultimate strength of tubular members with localized pitting.