Reliability of Super-T PSC girders at serviceability limit state stresses across all span ranges

Melhem, Mayer M.; Caprani, Colin C.; Stewart, Mark G.

doi:10.1080/15732479.2019.1581228

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…where er f is the error function; C is the concrete cover thickness; D C is the chloride diffusion coefficient; C cr is the critical chloride concentration; C 0 is the mass concentration of chloride on the concrete surface; C, D C , C cr , and C 0 are all random variables; the probability distribution types and characteristic parameters of such variables can be obtained by experimental and theoretical model calculation [13,38]; and the initial corrosion time of reinforcement T i is also a random variable according to Equation (1). The corrosion of reinforcement is an electrochemical reaction process, and there is a quantitative relationship between the corrosion rate of reinforcement and the corrosion current density at time t. Stewart provided calculation equations of the corrosion current density and corrosion rate of reinforcement at time t after the beginning of corrosion [39,40], which can be expressed as:…”

Section: Corrosion Time and Rate Of Reinforcementmentioning

confidence: 99%

“…where α T r = α i and β T r = β i + α i /n T r l , and T r is the evaluation standard period. Therefore, the load expectation and standard deviation in the evaluation standard period are µ = 0.5772 1 α Tr + β T r and σ = 1.2825 1 α Tr , respectively.…”

Section: Vehicle Load Effect Calculation Modelmentioning

confidence: 99%

“…Additionally, they have a typical beam-grid structure. This kind of bridge has a simple structure for theoretical analysis [1][2][3]. However, simply supported T-beam bridges are inevitably influenced by disadvantageous environmental and vehicle load factors during their service life.…”

Section: Introductionmentioning

confidence: 99%

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Time-Dependent Reliability Assessment Method for RC Simply Supported T-Beam Bridges Based on Lateral Load Distribution Influenced by Reinforcement Corrosion

Tan

Chu

et al. 2022

Applied Sciences

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The safety and reliability of bridges gradually decrease over time under the influence of disadvantageous environmental factors, primarily due to reinforcement corrosion caused by chloride ingress. The traditional lateral load distribution (LLD) theory does not consider the influence of corrosion, which degrades the accuracy of bridge performance and reliability calculation. A time-dependent reliability assessment method for simply supported T-beam bridges is proposed in this paper, which considers the influence of reinforcement corrosion on LLD. Firstly, the steel corrosion process and degree are predicted based on the chloride ingress model, into which the water/cement ratio and concrete strength are innovatively introduced in order to improve the prediction accuracy. Secondly, the effective stiffness calculation method for corroded reinforcement bridges is established with the moment of inertia and section crack condition employed. Thirdly, the modified eccentric compression method is improved by the effective stiffness and iterative algorithm, which is suitable for the LLD calculation of corroded reinforcement bridges. The time-dependent vehicle load effect can be computed combined with the probability distribution of live load. Finally, the time-dependent reliability of the flexural bearing capacity is obtained by the Monte Carlo method and Bayesian theory without prior information. A simply supported bridge with five T-beams is taken as an example for analysis. It is indicated that the results calculated by the traditional reliability method are conservative, which cannot make a true and accurate evaluation. The method proposed in this paper can effectively reduce the assessment error caused by model uncertainty while considering the interaction between reinforcement corrosion and vehicle live load effect.

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