Abstract

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Title:: Life-cycle Cost Model of Corroded Concrete Structures Based on Time-varying Reliability

Author(s):: LU Chun-hua; YUAN Si-qi; Faculty of Civil Engineering and Mechanics, Jiangsu University

Keywords:: concrete structure; chloride erosion; corrosion crack width; time-varying reliability; life-cycle cost

Abstract:: In order to analyze the life-cycle cost of concrete structures in chloride environment, the existing chloride diffusion model and crack width prediction model were used, Monte-Carlo sampling simulation was carried out using MATLAB software, and the fitting formula of structural failure probability and reliability index was established. The calculation method of maintenance-reinforcement cost in the whole life cycle was established combining the influence of maintenance-reinforcement measures on reliability index, and the life-cycle maintenance-reinforcement cost was calculated by taking concrete bridge structure as an example. The results show that the failure probability and reliability index can be described by piecewise function with failure probabilities being 0.1 as boundary. The duration of maintenance-reinforcement effect has the most obvious effect on service life extension of structural members. When the thickness of protective layer is 60 mm, the maintenance-reinforcement cost decreases obviously, and is reduced by 25%50% compared with the thickness of protective layer 40 mm.