Dynamic behavior and damage evolution of corroded high-piled wharf structures under ship impact

Abstract

High-piled wharves are typical offshore reinforced concrete structures serving in marine environments. They are affected by both chloride-induced steel corrosion and accidental ship impact. Currently, few studies have systematically explored their overall dynamic responses and damage mechanisms under the above combined loads. A refined three-dimensional numerical model of the ship-wharf-soil coupled system is established in ABAQUS using the finite-infinite element method. The model takes into account the strain rate effects of steel and concrete, as well as the trilinear constitutive model of corroded reinforcement. Four corrosion rates (0%, 5%, 10%, 15%) and four ship impact velocities (0.2, 0.4, 0.8, 1.2 m/s) are adopted to systematically explore their combined influences on the dynamic performance and damage characteristics of the wharf. The results indicate that when the corrosion rate rises from 0% to 15%, the peak displacement increases by 0.86%–9.38% at the impact velocity of 0.2 m/s, and 4.40%–15.85% for velocities ranging from 0.4 m/s to 1.2 m/s. Corrosion significantly increases the deformation sensitivity of pile heads to impact loads. The pile head bending moment presents an obvious double-peak feature; with the corrosion rate rising from 0% to 15%, the peak bending moment increases nonlinearly by 2.80%–16.33% under combined corrosion and impact loading. Moreover, corrosion advances the initiation and development of structural damage and induces damage transfer from the superstructure to corroded piles. The findings provide theoretical support and quantitative basis for performance evaluation, damage diagnosis and anti-impact strengthening of high-piled wharves.