Analytical and Numerical Investigation of Embedded Through-section GFRP-Strengthened RC Beams with a Developed Bonding-based Model

This study analytically and numerically investigated the shear performance of rectangular concrete beams strengthened with embedded through-section (ETS) glass fiber-reinforced polymer (GFRP) bars. The key features of the bonding-based approach were first formulated and then validated by comparing their mechanism with the actual shear resistance mechanism of a strengthening system. Thereafter, a finite element method (FEM) incorporating the bondingbased approach was used to simulate the shear behaviors of ETS-GFRP-strengthened beams. Conversely, the shear crack angle model for ETS-GFRP-strengthened beams was empirically developed to enhance the accuracy of the prediction. The experimental data recently investigated by the authors regarding pullout tests and beam tests were utilized to verify the numerical and analytical results. The analyses indicate that the FE model coupled with the bonding-based approach is a universal and powerful method for simulating the behavior of ETS-GFRPstrengthened beams with and without anchorage. The results demonstrate the great potential of the analytical model, established on the basis of the bond mechanism, for assessment of the shear resistance of ETS-GFRP-strengthened beams.

Automated summary

This study investigates the shear performance of rectangular concrete beams strengthened with embedded through-section (ETS) glass fiber-reinforced polymer (GFRP) bars using analytical and numerical methods. The bonding-based approach is formulated and validated, and a finite element method (FEM) is used to simulate the shear behaviors of the strengthened beams. The results demonstrate the potential of the bonding-based approach and the analytical model for assessing the shear resistance of ETS-GFRP-strengthened beams.