Optimal Methods for Retrofitting Corrosion-damaged Reinforced Concrete Columns☆

Abstract By neglecting optimization criteria, engineers can articulate different views with respect to retrofitting a column for a particular bending moment and axial load for columns deteriorated by corrosion, especially those in a salt factory where they are exposed to chloride ions. In this study, ETABS and MATLAB softwares were applied to develop an optimal plan that involves minimal repair costs and maximum safety. To determine the specifics of this optimal plan, it needs to consider all variable parameters, including externally bonded steel plates, different types of concrete jacketing, and various concrete compressive strengths. By stabilizing implemented loadings and building's dimensions, 30 retrofitting designs are identified for consideration with respect to the two retrofitting methods to identify their effects on structural component design, sustainability, and economics. A comparison of two retrofitting methods reveals that the use of each retrofitting method would be effective under certain circumstances. However, in this study, externally bonded steel plates appear to be more effective for the type of construction problems identified. In addition, the results indicate that the consideration of safety factors in the corroded structure to obtain optimal retrofitting can exert dramatic effects on the parameters involved in the process. Therefore, all variables are carefully analyzed in this study.

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