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Strengtheningof reinforced concrete pipes is a relevant task, as a significant portion of existing culverts exhibits defects and damages that reduce their load-bearing capacity and durability. One of the most effective reinforcement methods is sleeving, which involves installing a metal pipe inside the damaged structure, followed by filling the gap with high-strength mortar. However, during operation, such reinforced structures are subjected to variable mechanical loads and temperature fluctuations, which can lead to additional stresses and deformations. A finite element model of the reinforced concrete pipe was developed, and its stress-strain state under combined mechanical and thermal loads was analyzed using the FEMAP with NX Nastran software package. It was established that temperature gradients are unevenly distributed across the thickness of the structure, causing local stress concentrations at the interface between the metal sleeve and concrete. The modeling results showed that the maximum stresses occurring under a load of 16.67 kN and a temperature of +50 °C reached 8.87 MPa, while displacements amounted to 8.26 mm. Additionally, the temperature increase induced extra stresses of 0.9 MPa and additional displacements of 0.6 mm in the structure. The identified patterns can be utilized to improve reinforcement methods for reinforced concrete pipes, predict their performance under operational conditions, and enhance the durability of transport structures.

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Establishment of Regularities in the Stress-Strain State of Strengthened Reinforced Concrete Pipes Under Force Loads and Thermal Effects

  • 会议论文

  • 发表日期：

    2025年

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  • Roman Rybak,
  • Vitalii Kovalchuk,
  • Bohdan Parneta

摘要

Strengtheningof reinforced concrete pipes is a relevant task, as a significant portion of existing culverts exhibits defects and damages that reduce their load-bearing capacity and durability. One of the most effective reinforcement methods is sleeving, which involves installing a metal pipe inside the damaged structure, followed by filling the gap with high-strength mortar. However, during operation, such reinforced structures are subjected to variable mechanical loads and temperature fluctuations, which can lead to additional stresses and deformations. A finite element model of the reinforced concrete pipe was developed, and its stress-strain state under combined mechanical and thermal loads was analyzed using the FEMAP with NX Nastran software package. It was established that temperature gradients are unevenly distributed across the thickness of the structure, causing local stress concentrations at the interface between the metal sleeve and concrete. The modeling results showed that the maximum stresses occurring under a load of 16.67 kN and a temperature of +50 °C reached 8.87 MPa, while displacements amounted to 8.26 mm. Additionally, the temperature increase induced extra stresses of 0.9 MPa and additional displacements of 0.6 mm in the structure. The identified patterns can be utilized to improve reinforcement methods for reinforced concrete pipes, predict their performance under operational conditions, and enhance the durability of transport structures.