COMPARATIVE STUDY ON BENDING PERFORMANCE NUMERICAL SIMULATION OF DIFFERENT TYPES OF FRP REINFORCED CONCRETE BEAMS BASED ON ANSYS
DOI:
https://doi.org/10.36773/1818-1112-2025-138-3-45-52Keywords:
FRP reinforcement, concrete beam, bending performance, numerical simulation, load-deflection curve, SOLID65, William – WarenkeAbstract
By simulating a three-point bending loading process, the failure modes, load-deflection curves, flexural stiffness, ultimate bearing capacity, and crack propagation modes of each model are compared and analyzed. Simulation results show that the reinforced concrete beam model (Steel-RC) exhibits typical elastoplastic behavior, ultimately resulting in ductile failure due to steel bar yielding (Pu ≈ 56,0 kN, δu ≈ 40,0 mm). All FRP-reinforced beam models adopted an over-reinforced design, and the final failure mode was the crushing of the concrete in the compression zone, exhibiting brittle failure characteristics. The mechanical properties of different FRP reinforcement materials, especially the elastic modulus, play a decisive role in the bending performance of beams: the CFRP reinforced beam model (Ef = 124,2 GPa) has the highest bending stiffness and ultimate bearing capacity (Pu ≈ 125,0 kN) and the lowest ultimate deflection (δu ≈ 30,0 mm); among all FRP reinforced beams, the GFRP reinforced beam model (Ef = 45,0 GPa) has the lowest post-cracking stiffness and ultimate bearing capacity (Pu ≈ 82,5 kN), and the largest ultimate deflection (Δu ≈ 40,0 mm); the performance of the AFRP reinforced beam model (Ef = 50,1 GPa) is between the two (Pu ≈ 86,4 kN, Δu ≈ 35,0 mm). This study confirms the effectiveness of the finite element method in simulating the stress behavior of FRP-reinforced concrete beams. The results quantify the key differences in flexural properties among different FRP reinforcement materials, providing an important numerical basis and design reference for the engineering community to rationally select FRP materials based on structural performance requirements (strength control or stiffness control) when facing durability challenges.
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