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- W2247889599 abstract "Corrosion of steel due to chloride contamination is one of the primary causes of deterioration of prestressed concrete structures. Clearly, chloride-induced pitting corrosion is a spatial and temporal variable. Therefore, ignoring spatial variability of pitting corrosion in structural prediction models is not very realistic. However, most studies to date have only modelled the strength and reliability of reinforced concrete (RC) and prestressed concrete (PSC) flexural members subject to deterioration by focusing on homogeneous material and deterioration properties and sectional capacities at regions of peak or critical sections. Hence, ignoring the spatial variability of pitting corrosion will lead to an over-estimation of structural capacities and structural reliabilities, at least for members in flexure. The present paper considers the effect of temporal and spatial variability of pitting corrosion on the time-dependent performance and reliability of PSC beams in flexure with bonded tendons. A probabilistic model of pitting corrosion is developed from maximum pit-depth data obtained from accelerated corrosion tests in a chloride-contaminated concrete environment. The probabilistic model of pitting corrosion of strands is then combined with non-linear Finite Element Analysis (FEA) as well as models of corrosion initiation and propagation to study the effect of pitting corrosion on the strength and serviceability of prestressed concrete beams. This will allow time to failure and time-dependent structural reliabilities to be calculated. Including the effect of spatial variability allows the analysis to consider failure of strands at any location along the beam, as well as progressive failure of multiple strands as failure of one strand will increase the stress in remaining strands thus leading to possible rupture of other highly stressed or corroded strands. Three alternate prestressing strand failure modes are considered: stress corrosion cracking, brittle fracture and yielding. The proposed method is independent of the pretensioned PSC structure being considered, but for illustrative purposes a typical PSC bridge girder located at a coastal environment is selected as the application." @default.
- W2247889599 created "2016-06-24" @default.
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- W2247889599 date "2005-01-01" @default.
- W2247889599 modified "2023-09-26" @default.
- W2247889599 title "Effect of Pitting Corrosion on Structural Reliability of Prestressed Concrete Bridge Girders" @default.
- W2247889599 hasPublicationYear "2005" @default.
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