Abstract
A probabilistic analysis approach for estimating the durability of piles with microcracks under chloride attack is presented. The chloride ingress model is obtained by considering the time-dependent diffusion process. The equivalent diffusion coefficient is derived to investigate the crack effect by introducing the crack effect factor. The fitting formula between the chloride diffusion coefficients and crack widths is established through experimental results, and the proposed equivalent diffusion coefficient is verified by comparison with the experimental results. The probabilistic evaluation of durability of piles with microcracks is performed, and then the parametric analysis is performed to study the effect of main parameters on the failure probability and durability life. The results indicate that the chloride concentration increases rapidly as the crack width increases at the same number of cracks. The durability life greatly reduces with increasing crack density of pile. The durability life predicted by probabilistic method is always less than those by deterministic method at the same condition. The deterministic approach may underestimate the threat of reinforcement corrosion induced by chloride attack, owing to the omission of probabilistic nature of main influencing parameters.
Highlights
Corrosion caused by chloride ions is accepted as the significant deterioration mechanism of reinforced concrete piles
10% of failure probability is applied as limit state for the durability of piles under chloride attack
To obtain the durability life based on deterministic method, the chloride concentration is calculated from Eq (5) using the means of random variations
Summary
Corrosion caused by chloride ions is accepted as the significant deterioration mechanism of reinforced concrete piles. In view of the significant uncertainty concerning these factors, the probabilistic approaches have been proposed as an attractive alternative to complement a large margin of error of the deterministic methods by considering these parameters as random variables. To incorporate the uncertainty of influencing parameters into the durability analysis, many probabilistic approaches and techniques have recently been proposed to represent chloride penetration and subsequent reinforcement corrosion in reinforced concrete structures (El Hassan et al, 2010; Kirkpatrick et al, 2002; Nogueira & Leonel, 2013; Saassouh & Lounis, 2012; Strauss et al, 2013; Zhu et al, 2016). The equivalent diffusion coefficient is derived by considering the timevarying process of chloride penetration and the effect of microcracks. The durability life of piles with microcracks is estimated by the probabilistic method based on the proposed equivalent diffusion coefficient. The deterministic and probabilistic results of durability life are compared and the parametric analysis of main influencing factors is performed
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