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Mechanical Degradation of Reinforced Concrete Columns Corroded Under Sustained Loads

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Abstract

This study presented an experimental investigation on the degradation of mechanical performance of reinforced concrete (RC) columns with the reinforcements corroded under sustained loads. A total of ten RC column specimens were tested. The effects of different levels of sustained load (0%, 30%, and 60% of the designed ultimate bearing capacity Nu) and reinforcement corrosion (0%, 5%, 10%, and 20%) on the failure modes, ultimate bearing capacity, and axial load–axial deformation relationship were analyzed. The results showed that the coupling adverse effects due to the reinforcement corrosion and sustained load considerably exacerbate the mechanical deterioration of RC columns and turn the failure mode into a much more brittle manner. Compared with the control specimen L-0-0, the ultimate bearing capacity of the specimen L-4-20 could be reduced as much as about 42%. Based on the test results, an improved model was proposed to estimate the ultimate bearing capacity of corroded RC columns, in which the effects of the corrosion of both longitudinal reinforcements and stirrups and the corrosion-induced spalling of concrete cover were taken into consideration. The close agreements between the analytical predictions and test results prove the applicability of the model.

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Funding

Fundings were provided by National Natural Science Foundation of China (Grant Nos. 51808475 and 51678529) and Guangdong Natural Science Fund (Grant No. 1146).

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Authors and Affiliations

  1. College of Civil Engineering and Architecture, Zhejiang University of Water Resources and Electric Power, Hangzhou, China

    Qiang Li

  2. Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China

    Le Huang & Hailong Ye

  3. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, China

    Chuanqing Fu

  4. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China

    Xianyu Jin

Authors
  1. Qiang Li
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  2. Le Huang
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  3. Hailong Ye
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  4. Chuanqing Fu
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  5. Xianyu Jin
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Correspondence to Hailong Ye.

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Li, Q., Huang, L., Ye, H. et al. Mechanical Degradation of Reinforced Concrete Columns Corroded Under Sustained Loads. Int J Civ Eng 18, 883–901 (2020). https://doi.org/10.1007/s40999-020-00511-w

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  • DOI: https://doi.org/10.1007/s40999-020-00511-w

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