Vol. 20, No. 1, pp. 12-20 (2024)
RESIDUAL LIFE PREDICTION AND DESIGN CORRECTION METHOD OF
CORRODED CIRCULAR STEEL TUBES BASED ON
TIME-VARYING RELIABILITY
Zhi-Wei Zhang 1, Hua-Jie Wang 1, *, Hong-Liang Qian 1, Xiao-Fei Jin 2, Qiu Feng 1, 3 and Feng Fan 3
1 Department of Civil Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
2 China Construction First Group Corporation Limited, Beijing 100161, China
3 School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
*(Corresponding author: E-mail:This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 15 January 2023; Revised: 31 May 2023; Accepted: 27 August 2023
DOI:10.18057/IJASC.2024.20.1.2
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ABSTRACT
Current research on the effects of corrosion on the safety of steel members is primarily focused on the degradation of the ultimate bearing capacity, and there is a lack of research on the reliability-based service life assessment. In this paper, a modified reliability function and an uncertainty model for each parameter considering the effects of corrosion are established based on the reliability analysis method of the GB50068-2018 design specification. The effects of the corrosive environment category, wall thickness, and slenderness ratio on the time-varying reliability of axially compressed round tubes are analyzed. The results indicate that an increase in the corrosion duration and the environmental category can cause a decrease in the reliability index of the component, and the smaller the wall thickness, the faster the corrosion-related degradation of the reliability index. However, with the increase of the slenderness ratio, the corrosion-related degradation of the reliability index gradually decreases. In the end, a residual life prediction method and a design correction method for corroded components based on the reliability index are proposed. Moreover, the values of the corrosion life and corrosion coefficient of circular steel tubes for different environmental categories, slenderness ratios, and thicknesses are determined. This paper provides a technical reference for the residual life prediction and full life design of round steel tubes considering local corrosion.
KEYWORDS
Local corrosion, Round steel tubes, Reliability, Durability, Residual life prediction
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