Finite Element Analysis of Bonded Prestressed Strengthened Hollow Slab Beams
DOI:
https://doi.org/10.14311/CEJ.2026.01.0010Keywords:
Bonded prestressing, Hollow slab beams, Finite element analysis, Stress distribution, Strengthening technology, ANSYS simulationAbstract
With the continuous increase in traffic loads, the insufficient bearing capacity of existing bridges has become increasingly prominent, necessitating effective strengthening technologies to enhance their performance. This study focuses on bonded prestressed strengthened hollow slab beams. A finite element analysis method was employed to establish a discrete model comprising concrete (SOLID65 elements), composite mortar (SHELL41 elements), and prestressed tendons (LINK8 elements), with nonlinear spring elements used to simulate the interaction at the bonding layer. A three-point loading method was adopted to analyze the stress distribution characteristics of the strengthened beam under 10 kN and 80 kN loads, with emphasis on the stress responses in the anchorage zone, mid-span cross-section, and reinforcement. The results indicate significant stress concentration in the anchorage zone, requiring reinforcement in engineering design. When the cross-section approaches the destressed state (stress range: 0.1 MPa to -0.2 MPa), there is a notable discrepancy between finite element simulation results and material mechanics theoretical values. However, good agreement is observed in non-destressed states. Additionally, the stress variation trend of prestressed tendons under increasing loads aligns with theoretical predictions, with an error margin below 0.8%. This research provides theoretical and numerical references for the engineering application of bonded prestressed strengthening techniques.
Received: 28.05.2025
Received in revised form: 21.01.2026
Accepted: 19.03.2026
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