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A Split-Wedge Anchorage for CFRP Cables: Numerical Model vs. Experimental Results.

Marco Damiani1, Nicola Nisticò1

  • 1Department of Structural and Geotechnical Engineering, Sapienza University of Rome, 00184 Rome, Italy .

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Summary

Researchers developed an optimized double-angle (DA) wedge anchorage for fiber-reinforced polymer (FRP) tendons, significantly improving cable capacity and reducing stress peaks compared to single-angle (SA) designs.

Keywords:
FRP cablesexperimental testsfinite element analysisprestressing systemssplit-wedge anchorages

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Structural Engineering

Background:

  • Fiber-reinforced polymers (FRPs) offer high strength, stiffness, and environmental resistance, making them suitable for civil structural applications.
  • FRP cables are increasingly considered for prestressing systems as alternatives to traditional steel cables.
  • The inherent brittleness of FRP materials presents challenges in designing reliable anchorage systems to prevent premature failure.

Purpose of the Study:

  • To investigate and compare the performance of a novel double-angle (DA) split-wedge anchorage system with a conventional single-angle (SA) configuration for pultruded carbon fiber-reinforced polymer (PCFRP) tendons.
  • To evaluate the effectiveness of the DA anchorage in mitigating stress concentrations at the tendon's loading end.
  • To utilize experimental data for calibrating nonlinear finite element models for further analysis.

Main Methods:

  • Experimental tensile testing of 12 mm-diameter PCFRP tendon prototypes using both SA and DA wedge anchorage configurations.
  • Performance evaluation based on achieved cable capacity and anchorage efficiency.
  • Development and calibration of nonlinear finite element models using experimental results to simulate stress distribution and component behavior.

Main Results:

  • The DA wedge configuration successfully achieved the average cable capacity (257 kN) in one test, demonstrating high efficiency.
  • Numerical simulations confirmed that the DA configuration effectively avoids stress peak superpositions on the PCFRP tendon.
  • The DA anchorage resulted in reduced pressure at the loading end of the tendon compared to the SA configuration.

Conclusions:

  • The optimized DA split-wedge anchorage system is highly effective for PCFRP tendons in prestressing applications.
  • The DA design significantly enhances anchorage performance by mitigating critical stress concentrations, thereby improving safety and reliability.
  • Finite element analysis provides valuable insights into the behavior of anchorage components and validates the benefits of the DA configuration.