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A new analytical method has been proposed to forecast the torsional behavior of reinforced concrete (RC) girder strengthened with fiber-reinforced polymer (FRP). The proposal was an enhanced modified-softened-variable-angle-truss model, considering the impact of FRP strengthening on concrete confinement alongside softened compressive and tensile behaviors in concrete. A database of 36 solid RC girders, strengthened with diverse FRP systems, was analyzed to evaluate the precision and dependability of the proposed model, considering an iterative trial-and-error algorithm. The results indicate agreement between experimental and analytical findings, confirming the RA-MSTMT-FRP model as a feasible method for forecasting torsional response.

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A New Analytical Proposal for Evaluating Torsional Behavior of FRP-Strengthened Reinforced Concrete Beam Based on Modified-Softened-Variable-Angle-Truss Model

  • 会议论文

  • 发表日期：

    2026年

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  • Vinh Sang Nguyen,
  • Anh Dung Nguyen,
  • Ngoc Thang Nguyen,
  • Van Toan Nguyen

摘要

A new analytical method has been proposed to forecast the torsional behavior of reinforced concrete (RC) girder strengthened with fiber-reinforced polymer (FRP). The proposal was an enhanced modified-softened-variable-angle-truss model, considering the impact of FRP strengthening on concrete confinement alongside softened compressive and tensile behaviors in concrete. A database of 36 solid RC girders, strengthened with diverse FRP systems, was analyzed to evaluate the precision and dependability of the proposed model, considering an iterative trial-and-error algorithm. The results indicate agreement between experimental and analytical findings, confirming the RA-MSTMT-FRP model as a feasible method for forecasting torsional response.