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Analytical modeling of corroded RC columns considering flexure-shear interaction for seismic performance assessment

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Abstract

Corrosion of transverse reinforcement can lead to significant shear capacity deterioration resulting in a ductile-designed reinforced concrete (RC) column to potentially fail in a shear manner. Increased risk of shear failure can be more significant for short shear-critical columns when corrosion occurs. Therefore, shear response can be a particularly important issue in seismic performance assessment of corroded RC columns. An efficient analytical model which can capture the shear capacity deterioration due to corrosion and the flexure-shear interaction behaviors of corroded columns is developed in this work. Corrosion effect on flexural behavior is accounted for through the appropriate modification of steel reinforcement, concrete and bond properties. Shear response is simulated by a new macro zero-length shear spring element, and its shear force-shear deformation relationship is modelled with the Ibarra-Medina-Krawinkler deterioration model that can capture strength and stiffness deterioration as well as pinching behavior. A calibration study is carried out based on a collection of experiments of corroded columns failed in shear. Subsequently empirical formulae for the determination of the modeling parameters of the shear spring are proposed. The proposed model is validated by simulating several corroded columns and compering the predictions obtained with the relevant test data. Results show that the proposed model is able to predict reasonably the overall hysteretic behavior. Corrosion effects on the seismic performance of RC columns are investigated with the proposed model. Results demonstrate that the flexure-shear interaction behaviors should be considered for seismic performance assessment of corroded columns.

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adapted from Ibarra et al. (2005)

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Acknowledgements

The authors acknowledge financial support from the National Key Research and Development Program of China (No. 2016YFC0701100, No. 2016YFC0701400) and the National Natural Science Foundation of China (No. 51525801). The financial support from China Scholarship Council (No. 201706090085) is also gratefully acknowledged. The opinions and conclusions presented in this paper are those of the authors and do not necessarily reflect the views of the sponsoring organizations.

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Authors and Affiliations

  1. Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing, 210096, China

    Ji-Gang Xu, De-Cheng Feng & Gang Wu

  2. Institute of Infrastructure and Environment, School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh, EH14 4AS, UK

    Demitrios M. Cotsovos

  3. Institute for Infrastructure and Environment, School of Engineering, The University of Edinburgh, Edinburgh, EH9 3JL, UK

    Yong Lu

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  1. Ji-Gang Xu
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  2. De-Cheng Feng
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  3. Gang Wu
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  4. Demitrios M. Cotsovos
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  5. Yong Lu
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Correspondence to Gang Wu.

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Xu, JG., Feng, DC., Wu, G. et al. Analytical modeling of corroded RC columns considering flexure-shear interaction for seismic performance assessment. Bull Earthquake Eng 18, 2165–2190 (2020). https://doi.org/10.1007/s10518-019-00770-6

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