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A platform for research: civil engineering, architecture and urbanism
Concave performance evaluation of GFRP-reinforced precast concrete tunnel lining segments
https://orcid.org/0000-0002-7628-0470
https://orcid.org/0000-0002-6685-0679
Highlights Shear strength of GFRP-reinforced PCTL segments loaded on concave side. Effects of concrete strength and reinforcement type and ratio on shear behavior of PCTL. Shear failure mechanism of PCTL reinforced with GFRP bars subjected to loads on concave side. Cracking behaviour of GFRP reinforced PCTLs loaded on negative curvature. Design Equations to predict shear strength and deflection of GFRP reinforced PCTL.
Abstract This paper reports on an investigation into the behavior of GFRP-reinforced precast concrete tunnel lining (PCTL) segments loaded on the concave side subjected to transportation, storage, and settlement loads induced by soil settlement underneath tunnels and/or internal vehicular accidents. Shear tests were conducted on four full-scale PCTL segments with a rhomboidal shape measuring 1500 x 250 mm in rectangular cross section and an arched length of 2100 mm. Three main parameters—namely, reinforcement type, concrete strength, and longitudinal reinforcement ratio—were studied under three-point loading until failure. The results reveal that all specimens experienced shear failure due to the diagonal tension mode, even if initiated by the yielding of flexural bars in the steel-reinforced segment. PCTLs reinforced with GFRP or steel bars at the same ratio demonstrated comparable shear strengths and satisfied serviceability limits. The use of both a high reinforcement ratio and high-strength concrete (HSC) increased the shear strength of the GFRP-reinforced PCTL segments. Experimental results were employed to review and verify North American code provisions and existing models with some amendments to meet the requirements of designing tunnel segments reinforced with GFRP bars in terms of deflection in the service state and checking shear strength in the ultimate limit state. Measured deflection was used to compare the experimental values of the effective moment of inertia to predictions with current models to evaluate their accuracy. Based on the analysis of the results, Bischoff’s equation for the effective moment of inertia of FRP-RC structures was modified, and an equation was developed to predict the deflection of GFRP-reinforced PCTL segments with 98 % accuracy. Based on a comparison of experimental and predicted shear capacities, the combination of concrete contributions (including the arch-shape effect of PCTLs and the tie resistance in the modified compression field theory (MCFT), plasticity theory (PT), and modified critical shear crack theory (CSCT)) provided better predictions.
Concave performance evaluation of GFRP-reinforced precast concrete tunnel lining segments
https://orcid.org/0000-0002-7628-0470
https://orcid.org/0000-0002-6685-0679
Highlights Shear strength of GFRP-reinforced PCTL segments loaded on concave side. Effects of concrete strength and reinforcement type and ratio on shear behavior of PCTL. Shear failure mechanism of PCTL reinforced with GFRP bars subjected to loads on concave side. Cracking behaviour of GFRP reinforced PCTLs loaded on negative curvature. Design Equations to predict shear strength and deflection of GFRP reinforced PCTL.
Abstract This paper reports on an investigation into the behavior of GFRP-reinforced precast concrete tunnel lining (PCTL) segments loaded on the concave side subjected to transportation, storage, and settlement loads induced by soil settlement underneath tunnels and/or internal vehicular accidents. Shear tests were conducted on four full-scale PCTL segments with a rhomboidal shape measuring 1500 x 250 mm in rectangular cross section and an arched length of 2100 mm. Three main parameters—namely, reinforcement type, concrete strength, and longitudinal reinforcement ratio—were studied under three-point loading until failure. The results reveal that all specimens experienced shear failure due to the diagonal tension mode, even if initiated by the yielding of flexural bars in the steel-reinforced segment. PCTLs reinforced with GFRP or steel bars at the same ratio demonstrated comparable shear strengths and satisfied serviceability limits. The use of both a high reinforcement ratio and high-strength concrete (HSC) increased the shear strength of the GFRP-reinforced PCTL segments. Experimental results were employed to review and verify North American code provisions and existing models with some amendments to meet the requirements of designing tunnel segments reinforced with GFRP bars in terms of deflection in the service state and checking shear strength in the ultimate limit state. Measured deflection was used to compare the experimental values of the effective moment of inertia to predictions with current models to evaluate their accuracy. Based on the analysis of the results, Bischoff’s equation for the effective moment of inertia of FRP-RC structures was modified, and an equation was developed to predict the deflection of GFRP-reinforced PCTL segments with 98 % accuracy. Based on a comparison of experimental and predicted shear capacities, the combination of concrete contributions (including the arch-shape effect of PCTLs and the tie resistance in the modified compression field theory (MCFT), plasticity theory (PT), and modified critical shear crack theory (CSCT)) provided better predictions.
Concave performance evaluation of GFRP-reinforced precast concrete tunnel lining segments
https://orcid.org/0000-0002-7628-0470
https://orcid.org/0000-0002-6685-0679
Highlights Shear strength of GFRP-reinforced PCTL segments loaded on concave side. Effects of concrete strength and reinforcement type and ratio on shear behavior of PCTL. Shear failure mechanism of PCTL reinforced with GFRP bars subjected to loads on concave side. Cracking behaviour of GFRP reinforced PCTLs loaded on negative curvature. Design Equations to predict shear strength and deflection of GFRP reinforced PCTL.
Abstract This paper reports on an investigation into the behavior of GFRP-reinforced precast concrete tunnel lining (PCTL) segments loaded on the concave side subjected to transportation, storage, and settlement loads induced by soil settlement underneath tunnels and/or internal vehicular accidents. Shear tests were conducted on four full-scale PCTL segments with a rhomboidal shape measuring 1500 x 250 mm in rectangular cross section and an arched length of 2100 mm. Three main parameters—namely, reinforcement type, concrete strength, and longitudinal reinforcement ratio—were studied under three-point loading until failure. The results reveal that all specimens experienced shear failure due to the diagonal tension mode, even if initiated by the yielding of flexural bars in the steel-reinforced segment. PCTLs reinforced with GFRP or steel bars at the same ratio demonstrated comparable shear strengths and satisfied serviceability limits. The use of both a high reinforcement ratio and high-strength concrete (HSC) increased the shear strength of the GFRP-reinforced PCTL segments. Experimental results were employed to review and verify North American code provisions and existing models with some amendments to meet the requirements of designing tunnel segments reinforced with GFRP bars in terms of deflection in the service state and checking shear strength in the ultimate limit state. Measured deflection was used to compare the experimental values of the effective moment of inertia to predictions with current models to evaluate their accuracy. Based on the analysis of the results, Bischoff’s equation for the effective moment of inertia of FRP-RC structures was modified, and an equation was developed to predict the deflection of GFRP-reinforced PCTL segments with 98 % accuracy. Based on a comparison of experimental and predicted shear capacities, the combination of concrete contributions (including the arch-shape effect of PCTLs and the tie resistance in the modified compression field theory (MCFT), plasticity theory (PT), and modified critical shear crack theory (CSCT)) provided better predictions.
Concave performance evaluation of GFRP-reinforced precast concrete tunnel lining segments
Elbady, Ahmed (author) / Mousa, Salaheldin (author) / Mohamed, Hamdy M. (author) / ElSafty, Adel (author) / Benmokrane, Brahim (author)
2024-02-16
Article (Journal)
Electronic Resource
English
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