Title:
Hysteresis Behavior of Glass Fiber-Reinforced Polymer- Reinforced Precast Concrete Tunnel Segments under Cyclic Load
Author(s):
Basil Ibrahim, Salaheldin Mousa, Hamdy M. Mohamed, and Brahim Benmokrane
Publication:
Structural Journal
Volume:
121
Issue:
3
Appears on pages(s):
83-96
Keywords:
deformability; glass fiber-reinforced polymer (GFRP) bars; high-strength concrete (HSC); hysteresis behavior; normal-strength concrete (NSC); precast concrete tunnel lining (PCTL) segments; quasistatic cyclic flexural loading
DOI:
10.14359/51740480
Date:
5/1/2024
Abstract:
The hysteresis response of precast concrete tunnel lining (PCTL)
segments reinforced internally with fiber-reinforced polymer (FRP)
bars under quasi-static cyclic flexural loading is an area for which
no experimental research results are available. This paper reports
on an investigation on the hysteresis behavior of PCTL segments
reinforced internally with glass fiber-reinforced polymer (GFRP)
bars. Full-scale curvilinear GFRP-reinforced PCTL segments were
designed, fabricated, and tested under quasi-static cyclic flexural
loading. The segments measured 3100 mm (122 in.) in length,
1500 mm (59 in.) in width, and 250 mm (9.8 in.) in thickness. The
test parameters were the longitudinal reinforcement ratio, the transverse
reinforcement configuration, and the concrete compressive
strength. The hysteresis response, cracking pattern, and ductility
of the PCTL segments were identified and experimentally evaluated.
The experimental results of the current study demonstrate that
the hysteresis response of the curvilinear GFRP-reinforced PCTL
segments had stable cyclic behavior with no or limited strength
degradation until failure. In addition, analytical prediction of the
load-carrying capacity, deflection, and unloading stiffness of the
test segments was carried out. The segments’ analytically predicted
responses were validated and compared to the experimental results.
The segments’ analytically predicted models for the post-cracking
loading tangent stiffness and unloading stiffness for the curvilinear
GFRP-reinforced PCTL segments are proposed herein. The
analytically predicted hysteresis response shows accurate predictions with comparable loading stiffness, unloading stiffness, and residual deformation at the end of each loading cycle.