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Abstract This study investigates the flexural performance of metro tunnel segments reinforced with traditional rebar and fiber-reinforced concrete (FRC). Utilizing a comprehensive experimental approach, the mechanical properties of FRC were determined and compared with ordinary concrete through rigorous laboratory tests. A detailed numerical analysis was conducted using a 3D finite element model (FEM) in ABAQUS 2022, validated with experimental data. The FEM assessed segments reinforced with traditional rebar versus those with a 50% reduction in rebar, supplemented by FRC. The Concrete Damage Plasticity (CDP) model effectively simulated the flexural behavior, revealing a 30% reduction in tensile damage with FRC. Further analysis revealed significant improvements in stress responses, including a 2.6-fold increase in von Mises stress and a 60% reduction in vertical displacement. These findings highlight the enhanced structural performance and economic benefits of incorporating FRC with reduced rebar, as well as the environmental advantages of using recycled fibers. This study provides critical insights into optimizing tunnel segment reinforcement, promoting both structural integrity and sustainability in tunnel construction projects.
Ahmadi et al. (Thu,) studied this question.
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