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STRENGTH REDUCTION OF REINFORCED CONCRETE COLUMNS SUBJECTED TO CORROSION RELATED COVER SPALLING

Khalid, Nibras Nizar
http://orcid.org/0000-0003-4661-7914
http://rave.ohiolink.edu/etdc/view?acc_num=akron152536559529405

Abstract Details

2018, Doctor of Philosophy, University of Akron, Civil Engineering.
The performance of deteriorated reinforced concrete columns subjected to eccentric loads had been investigated in this research considering the effects of the concrete cover spalling location and the amount of spalling on the residual strength of rectangular and circular sections by developing axial load-moment interaction diagrams. The influence of several factors associated with material properties and amount of reinforcement on the improvement of the residual strength of such columns were investigated. Based on the theoretical analysis, it was found that the most critical case is where the concrete cover spalling occurs on the compression side of the column; therefore, this case was selected to carry out an experimental work to verify the accuracy of the developed model. The experimental failure load was found to be more than the calculated theoretical load with an acceptable tolerance which allows for safety if the equivalent rectangular stress block is used, while using the actual parabolic stress strain curve for concrete was found to be unsafe for some cases. The increase of the reinforcement area leads to an enhancement of the performance of the deteriorated columns by various proportions depending on the case and the loading conditions. Also, it was found that using a high grade of steel (72 ksi) significantly improves the strength of columns loaded with large eccentricities, while using concrete with higher compressive strength increases the capacity of the columns loaded with small eccentricities with e/h up to 0.4. For concrete stress-strain relationship, it was found that using the actual parabolic curve overestimate the strength of deteriorated columns especially if the section is a compression-controlled section for both rectangular and circular sections. The comparison of the present study with previous theoretical and experimental studies reveals the applicability of the model for the strength evaluation of the deteriorated columns. A numerical analysis was conducted by using ABAQUS-3D model to simulate the deteriorated columns and it was found that the finite element analysis results are in good agreement with the experimental results and it was possible to simulate the column behavior using FE models. Also, design equations were developed from a data analysis using STATISTICA to express the ultimate failure load for the deteriorated columns for all the studied columns, and it was found that more than 97% of the predicted values had excellent correlation with the observed values.
Anil Patnaik, Dr. (Advisor)
Craig Menzemer, Dr (Committee Member)
Ping Yi, Dr (Committee Member)
Xiaosheng Gao, Dr (Committee Member)
Nao Mimoto, Dr (Committee Member)
220 p.
Civil Engineering
Column, Reinforced Concrete, Corrosion, Cover Spalling, ABAQUS, Deterioration

Recommended Citations

Citations

  • Khalid, N. N. (2018). STRENGTH REDUCTION OF REINFORCED CONCRETE COLUMNS SUBJECTED TO CORROSION RELATED COVER SPALLING [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron152536559529405

    APA Style (7th edition)

  • Khalid, Nibras. STRENGTH REDUCTION OF REINFORCED CONCRETE COLUMNS SUBJECTED TO CORROSION RELATED COVER SPALLING. 2018. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron152536559529405.

    MLA Style (8th edition)

  • Khalid, Nibras. "STRENGTH REDUCTION OF REINFORCED CONCRETE COLUMNS SUBJECTED TO CORROSION RELATED COVER SPALLING." Doctoral dissertation, University of Akron, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron152536559529405

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.