Journal of Concrete Structures and Materials

Journal of Concrete Structures and Materials

Effect of Polypropylene Fibers on the Seismic Performance of Longitudinal Joints in Segmental Tunnel Linings

Document Type : Original Article

Authors
Ata Hojat Kashani 1
Mehdi Shalchi Tousi 2
Payam Tarighi 3
1 Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran.
2 Department of Civil Engineering, Ahlul Bayt International University, Tehran, Iran.
3 Department of Civil Engineering, Faculty of Engineering, Ahlul Bayt International University, Tehran, Iran.
10.30478/jcsm.2026.550737.1403
Abstract
This study examines the effect of polypropylene fibers on the seismic performance of longitudinal joints in segmental tunnel linings. Tunnels, as vital components of urban infrastructure, are highly vulnerable to seismic hazards, and weaknesses in joint regions can compromise overall stability. In this research, the fiber-reinforced concrete behavior model was validated using experimental data, and nonlinear time-history analyses were conducted to evaluate the seismic response of the lining under multiple earthquake records. Three volumetric ratios of polypropylene fibers (0.7%, 1%, and 1.5%) were considered, and the longitudinal joint behavior was assessed in terms of stress, displacement, and moment–axial force interactions. The results revealed that the inclusion of 1.5% polypropylene fibers significantly enhances normal and shear strength, reduces critical displacements, and improves structural ductility. Moreover, the numerical findings showed good agreement with both the analytical relations provided by the ACI code and validated experimental data, confirming the reliability of the model. Overall, incorporating 1.5% polypropylene fibers can be proposed as a practical solution for improving the seismic safety and durability of segmental tunnel linings in earthquake-prone regions.
Keywords
structure of tunnel
segment cover
dynamic loads
fibers
tunnel lining
concrete damage model

Subjects

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  • Receive Date 05 October 2025
  • Revise Date 03 December 2025
  • Accept Date 14 February 2026