An Innovative FRP Pre-Stressing Device for Retrofitting Reinforced Concrete Beams

Document Type : Regular Paper

Authors

1 Ph.D. in Structural Engineering, Civil Engineering Faculty, Sahand University of Technology, Sahand, Iran

2 Associate Professor, Civil Engineering Faculty, Sahand University of Technology, Sahand, Iran

3 Professor, Civil Engineering Faculty, Sahand University of Technology, Sahand, Iran

Abstract

Fiber Reinforced Polymer (FRP) composites are commonly utilized for retrofitting concrete members. While this retrofitting approach offers numerous advantages, some challenges remain. Pre-stressing the FRP is a promising strategy to optimize the proficiency of this method by enhancing the effectiveness of the composite and delaying debonding failures. However, conventional pre-stressing methods require specialized equipment and anchorage solutions. This research introduces a device explicitly designed for pre-stressing FRP composites used in retrofitting of concrete beams and slabs. Eliminating the demand for hydraulic jacks, straightforward operation, and being lightweight are among the critical advantages of the device. Furthermore, the device’s dimensions and weight are adjustable to take into account various composite sizes, and desired pre-stress levels, ensuring economic and practical feasibility. This study details the design and construction of the device, followed by an evaluation of its performance in pre-stressing carbon fiber reinforced polymers (CFRP) for retrofitting reinforced concrete T-beams via experimental tests. The results showed the potential of the proposed device for utilization in retrofitting applications. Also, a finite element model of the device and the associated analysis methodology are presented.

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History

  • Receive Date: 23 November 2024
  • Revise Date: 16 December 2024
  • Accept Date: 14 January 2025

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