Journal:Engineering Structures

Abstract:Reinforced concrete (RC) structures in coastal environments are prone to chloride-induced reinforcement corrosion, which degrades their seismic performance. Due to spatial variability in environmental exposure, steel corrosion in RC members is often asymmetric, leading to distinct mechanical behavior depending on the corrosion location. To investigate these effects, quasi-static cyclic loading tests were conducted on 9 RC columns (3 uncorroded, 4 single-side corroded, and 2 double-side corroded) with corrosion ratios of 0%-20% under axial compression ratios ranging from 0.1 to 0.4. Special emphasis was placed on single-side corroded columns, where the corroded reinforcement was alternatively acted as the tensile and compressive reinforcement under horizontal cyclic loading. Seismic performance was evaluated in terms of hysteretic response, skeleton curves, energy dissipation, and deformation characteristics. The results indicate that for single-side corroded RC columns with axial compression ratio 0 f 0.1, tension-side corrosion causes a reduction of 1%-11% in lateral load-bearing capacity, 12%-52% in ultimate deformation, and 14%-61% in energy dissipation capacity, whereas compression-side corrosion leads to a decrease of 3%–16% in lateral load-bearing capacity, 8%-21% in ultimate deformation and 3%-44% in energy dissipation capacity. For the specimen with axial compression ratio of 0.4, tensile-side corrosion results in reductions of approximately 12% in load-carrying capacity and 20% in energy dissipation, whereas compressive-side corrosion leads to reductions of about 18% in both load-carrying capacity and energy dissipation, no significant degradation was observed in the ultimate deformation capacity. The performance differences caused by asymmetric corrosion are increased in load-bearing capacity but reduced in both ultimate dissipation and energy dissipation capacity when the axial ratio increases from 0.1 to 0.4. Finally, a lateral load capacity model incorporating asymmetric corrosion distribution and distinct deterioration mechanisms was proposed, and the model prediction results show an average error of only 2.9% compared with the experimental data. This study highlights the necessity of considering corrosion asymmetry in performance assessment of RC structures.

Indexed by:Journal paper

Page Number:2026,363:123020

Translation or Not:no

Included Journals:SCI

First Author:刘小娟

Co-author:连海涛,叶勇,郭子雄,郭云

Correspondence Author:傅博