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This paper analyzes the differences in the corrosion initiation life and lateral bearing capacity of reinforced concrete (RC) square piles in different marine corrosion zones. A chloride diffusion model is presented by considering the effect of environmental factors on the chloride apparent diffusion coefficient. Different surface chloride concentration models in different corrosion zones are used to predict the corrosion initiation life of RC square piles. The time-dependent degradation law of bending stiffness of RC square piles in different marine corrosion zones is investigated. The lateral bearing capacity of RC square piles with different bending stiffness reductions in different corrosion zones is analyzed. The analysis results show that the corrosion initiation life of RC square piles decreases sequentially in the atmospheric zone, submerged zone, and tidal and splash zones. At the same exposure time, the stiffness reduction coefficient in the tidal and splash zones is the smallest, compared with atmospheric zone and submerged zone. The maximum lateral displacement, bending moment and negative shear force of RC square piles with variable stiffness are greater than those of invariable stiffness piles in different corrosion zones. [ABSTRACT FROM AUTHOR]

This study investigates the effect of chlorine corrosion and flow scour on the lateral bearing capacity of piles. A chloride diffusion model was established to obtain the initial corrosion time of reinforcement based on Fick's second law. The degradation of stiffness after corrosion is represented by a reduction coefficient. The finite difference method is used to solve the deflection differential equation of laterally loaded piles. The maximum scouring depth of piles in cohesive soil and the variation of scouring depth with time are calculated by empirical model. The calculated results from the analytical solution revealed that the pile stiffness decreases with the exposure time. As the time increase, the lateral displacement and shear force decrease on the other hand the bending moment increases. The increase of flow velocity and pile diameter results in the increase of the maximum scour depth around the pile. The bending moment, shear force, and lateral displacement of piles after scour increase significantly compared to the lateral bearing performance of piles before scour. • Chloride diffusion model is established to obtain the initial corrosion time. • Degradation of pile stiffness is established by introducing the stiffness reduction coefficient. • Maximum scouring depth is calculated by empirical model. • Lateral bearing capacity of piles combined with corrosion and scour is investigated. [ABSTRACT FROM AUTHOR]