Li Qiang, Dong Zheng, He Qi, Fu Chuanqing, Jin Xianyu
Key Laboratory for Technology in Rural Water Management of Zhejiang Province, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China.
College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China.
Materials (Basel). 2022 May 18;15(10):3590. doi: 10.3390/ma15103590.
The effects of reinforcement corrosion and sustained axial load on mechanical performance of reinforced concrete (RC) columns were investigated in the present study. Three different degrees of reinforcement corrosion were achieved by controlling the durations of accelerated corrosion test (i.e., 16 days, 31 days, and 63 days). Three levels of sustained axial load (i.e., 0%, 30%, and 60% of the ultimate bearing capacity) were concentrically applied on column specimens. The impressing current and the sustained load were applied on column specimens simultaneously, mimicking the degradation of RC columns in real structures. Results indicated that transverse stirrups yielded higher corrosion degree than that of the longitudinal rebar under identical duration of accelerated corrosion test. The application of sustained axial load improved the performance of corroded RC columns in terms of the reinforcement corrosion, the ultimate axial load, as well as the stiffness. Additionally, more longitudinal cracks along the main rebar were exhibited for column specimens subjected to sustained axial load. For both loaded and unloaded column specimens, corrosion of reinforcing steels exacerbated the mechanical deterioration of RC columns, lowering the ultimate load carrying capacity and the axial deformation compared to the uncorroded columns.
本研究调查了纵筋锈蚀和持续轴向荷载对钢筋混凝土（RC）柱力学性能的影响。通过控制加速锈蚀试验的持续时间（即16天、31天和63天），实现了三种不同程度的纵筋锈蚀。对柱试件同心施加了三级持续轴向荷载（即极限承载力的0%、30%和60%）。对柱试件同时施加外加电流和持续荷载，模拟实际结构中RC柱的劣化情况。结果表明，在相同的加速锈蚀试验持续时间下，横向箍筋的锈蚀程度高于纵筋。持续轴向荷载的施加在纵筋锈蚀、极限轴向荷载以及刚度方面改善了锈蚀RC柱的性能。此外，承受持续轴向荷载的柱试件沿主筋出现了更多纵向裂缝。对于加载和未加载的柱试件，钢筋锈蚀都会加剧RC柱的力学性能劣化，与未锈蚀柱相比，降低了极限承载力和轴向变形。
