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This paper presents a summary of various research projects completed by the author and others focusing on strengthening reinforced and prestressed concrete (PC) bridges. The paper includes but not limited to strengthening of PC highway bridge girders having deteriorated bond between the prestressing strands and surrounding concrete, widening of bridges by extending pier cap beams, and strengthening of bridge footing using various strengthening systems. The analytical results of footing strengthened with external prestressing, stay-in-place steel forms, and carbon fiber reinforced polymer (CFRP) systems will be presented. Investigated strengthening systems have shown to be effective in increasing flexural/shear strength associated with slight decrease in ductility. All analytical models presented in this paper were verified against experimental results by the authors and other researchers. The finite element results were in good agreement with the experimental data. Details of all strengthening systems will be presented. For the PC bridge girders with deteriorated bond between the prestressing strands and the surrounding concrete, CFRP and steel plates were investigated for improving flexural strength. For bridge widening to accommodate an extra driving lane instead of shoulder lane, various systems were investigated. To accommodate additional driving lanes, the pier cap beam was extended using CFRP, steel plates, or post-tensioning systems. These systems have been shown to be effective in increasing the flexural and shear strengths of pier cap beams to allow for widening of bridge decks. For bridge footings, practical solutions were developed, which included circular post-tensioning system, ordinary reinforced concrete, stay-in-place steel forms that act as strengthening system, and CFRP wrapping. These strengthening systems did not involve expensive partial removal of existing concrete, nor splicing of existing steel reinforcing bars. Results of this investigation showed that these strengthening systems could increase the punching shear strength of bridge footings, which would allow for heavier traffic loads.

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Structural Strengthening of Concrete Bridge Girders, Piers and Foundation

  • 会议论文

  • 发表日期：

    2025年

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  • Riyad Aboutaha

摘要

This paper presents a summary of various research projects completed by the author and others focusing on strengthening reinforced and prestressed concrete (PC) bridges. The paper includes but not limited to strengthening of PC highway bridge girders having deteriorated bond between the prestressing strands and surrounding concrete, widening of bridges by extending pier cap beams, and strengthening of bridge footing using various strengthening systems. The analytical results of footing strengthened with external prestressing, stay-in-place steel forms, and carbon fiber reinforced polymer (CFRP) systems will be presented. Investigated strengthening systems have shown to be effective in increasing flexural/shear strength associated with slight decrease in ductility. All analytical models presented in this paper were verified against experimental results by the authors and other researchers. The finite element results were in good agreement with the experimental data. Details of all strengthening systems will be presented. For the PC bridge girders with deteriorated bond between the prestressing strands and the surrounding concrete, CFRP and steel plates were investigated for improving flexural strength. For bridge widening to accommodate an extra driving lane instead of shoulder lane, various systems were investigated. To accommodate additional driving lanes, the pier cap beam was extended using CFRP, steel plates, or post-tensioning systems. These systems have been shown to be effective in increasing the flexural and shear strengths of pier cap beams to allow for widening of bridge decks. For bridge footings, practical solutions were developed, which included circular post-tensioning system, ordinary reinforced concrete, stay-in-place steel forms that act as strengthening system, and CFRP wrapping. These strengthening systems did not involve expensive partial removal of existing concrete, nor splicing of existing steel reinforcing bars. Results of this investigation showed that these strengthening systems could increase the punching shear strength of bridge footings, which would allow for heavier traffic loads.