Experimental investigation of the bearing capacity of deformed segmental tunnel linings strengthened by a special composite structure

Liu, Xian; Jiang, Zijie; Mang, Herbert A.

doi:10.1080/15732479.2021.1924796

Cited by 16 publications

(7 citation statements)

References 22 publications

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“…The ductility was defined as the ultimate load-carrying capacity. Drawing on existing research results [28], the bearing capacity enhancement rate ηp = (Pu − P0)/P0, the stiffness enhancement rate ηk = ke/k0, and the structural ductility after reinforcement ∆S = Su − Sa were defined. The comparative results of the reinforcement effect are shown in Table 2.…”

Section: Comparative Analysis Of Reinforcement Effectsmentioning

confidence: 99%

“…From the damage mode, the damage of the steelplate-reinforced structure is manifested as the interfacial stripping damage between the steel plate and the original lining concrete. After reaching the peak load, the steel plate is completely plated from the lining, the steel plate rapidly quits the work, and the reinforced structure cannot withstand the external load and rapidly enters the plasticity stage, showing an apparent bri le damage mode [28]. In contrast, because of the combined shape of the UHPC layer, screws, and welding studs in the steel plate-UHPC reinforcing method, the interfacial bond layer has superior bond and ductility.…”

Section: Comparative Analysis Of Reinforcement Effectsmentioning

confidence: 99%

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Mechanical Characteristics of Cracked Lining Reinforced with Steel Plate–UHPC Subjected to Vertical Load

Wei,

Ding,

Shen

et al. 2024

Buildings

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The steel plate reinforcement method is widely used for strengthening damaged linings. Nevertheless, low durability is one of the disadvantages of the steel plate reinforcement method, which uses epoxy resin as the interface binder. To enhance the load-bearing performance and strengthening effect of steel-plate-reinforced structures, this study introduced ultra-high performance concrete (UHPC) as the reinforcing bonding layer and proposed a novel method for steel plate–UHPC reinforcement of cracked linings. A mechanical performance model test was conducted on a 1/5 scale lining model using a loading test device to evaluate the load-bearing performance and stress deformation of both conventional steel plate and steel plate–UHPC reinforced cracked linings. The characteristics, mechanisms of failure, and impacts of strengthening of the steel plate reinforcement method and steel plate–UHPC reinforcement method for cracked linings were compared. A numerical simulation model was developed to investigate the reinforcement effect of cracked linings using steel plate–UHPC reinforcement. The analysis included examining the influence of steel plate thickness, UHPC bonding layer thickness, and reinforcement timing. Model test results show that the overall damage mode of the steel plate–UHPC-reinforced structure had good elastic–plastic behaviour, and the deformation and damage process under the vertical concentrated load can be divided into four typical phases. Compared with the traditional steel plate reinforcement, the ultimate load-carrying capacity and ductility of the steel plate–UHPC-reinforced structure were increased by 53% and 366%, respectively, showing significantly better load-carrying capacity and deformation performance. Numerical simulation results show that the reinforced structure’s load-carrying capacity and stiffness enhancement rate increased non-linearly with the increase in UHPC layer thickness and steel plate thickness. However, reasonable reinforcement timing exists for steel plate-UHPC reinforcement, and too late reinforcement timing leads to a decrease in structural load-carrying capacity and stiffness enhancement rate.

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Section: Comparative Analysis Of Reinforcement Effectsmentioning

confidence: 99%

Section: Comparative Analysis Of Reinforcement Effectsmentioning

confidence: 99%

Mechanical Characteristics of Cracked Lining Reinforced with Steel Plate–UHPC Subjected to Vertical Load

Wei,

Ding,

Shen

et al. 2024

Buildings

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Section: Measurement Point Arrangement and Loading Schemementioning

confidence: 99%

“…Regarding the DN200 pipe, the spacing between the two battens was set to 25 mm; for the DN400 pipe sections, the spacing between the two battens was set to 40 mm. The test loading speed was set to 5 mm/min and the loading displacement to 10% of the pipes' diameter [14,15]. The plate load test results of specimens F-1, F-4, and F-9 are shown in Table 5, and the load-displacement curves of each specimen are shown in Figure 3.…”

Section: Comparative Analysis Of the Load-bearing Performance Of Corr...mentioning

confidence: 99%

Experimental Study on the Bearing Capacity of Reinforced Concrete Pipes with Corrosion-Thinning Defects Repaired by UHP-ECC Mortar Spraying

Zhang

Gong

et al. 2023

Applied Sciences

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The in situ spraying method is widely used because of its advantages as a trenchless pipeline repair technology, including a fast construction speed and close bonding between the repair lining layer and the reinforced concrete pipe. However, current research on high-performance spray repair materials, the bearing capacity of pipelines before and after repair, and the failure modes between the two interfaces after repair is insufficient. Through laboratory tests designed with multiple sets of control tests, this paper outlines the bearing capacity of reinforced concrete pipelines with corrosion thinning defects repaired with ultra-high-performance concrete. The variation law of the residual bearing capacity of reinforced concrete pipes and the influence of different corrosion degrees, repair thicknesses, and interface forms on the bearing capacity of reinforced concrete pipes were studied following UHP-ECC for pipe repair. The results showed that the bearing capacity of the structure decreased with an increase in the corrosion thickness of the pipeline. After repair with ultra-high-performance concrete, the bearing capacity of corroded pipelines greatly improved. When the corrosion and repair thicknesses were the same, the bearing capacity of the repaired pipeline with different interface forms was very different. After the interface was implanted with nails, spray repair was carried out and the bearing capacity of the pipeline improved the most, followed by the naturally bonded interface. When plastic film was pasted on the repair interface, the bearing capacity of the pipeline improved the least.

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“…Therefore, the demand for shield tunnel reinforcement is also increasing [ 1 ]. The methods of reinforcing shield tunnel linings with large deformations include FRP reinforcement [ 2 , 3 ], steel plate reinforcement [ 4 , 5 , 6 ], steel plate–UHPC composite reinforcement [ 7 , 8 ], and corrugated steel reinforcement [ 9 ], among which steel plate reinforcement is widely used in urban metro shield tunnel linings. However, as shown in Table 1 , due to the large self-weight of steel plates, mechanical arm support is an indispensable part of the construction, as shown in Figure 1 a.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Calculation Method for the Mechanical Properties of Filament Wound Profiles for Deformed Shield Tunnel Reinforcement

Zhang

Liu

2023

Materials

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A new type of structural material has begun to be used in the reinforcement of deformed shield tunnels, known as filament wound profiles (FWPs). The FWPs are formed by wrapping carbon-fiber-reinforced polymer (CFRP) around steel tubes that are grouted with concrete inside. However, for practical engineering applications, the design of FWPs requires further insight into their mechanical behavior, since there is no standard method for this at present. In this study, compression and bending tests were carried out to investigate the mechanical behavior of FWPs. A reliable numerical model was established based on the test results, and the effects of the design parameters on the mechanical properties of the FWPs were analyzed qualitatively. The key design parameters of bearing capacity and stiffness were determined through numerical experiments. Based on the experimental results, a method for the calculation of bearing capacities and stiffness was proposed. It was verified that the results of the calculation formulae and the experimental results showed good agreement. Moreover, the results of the formulae were relatively conservative, and most of the errors were within 15%. Thus, this calculation method can be used to calculate the load-bearing capacity and stiffness of FWPs in practical projects.

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Experimental investigation of the bearing capacity of deformed segmental tunnel linings strengthened by a special composite structure

Cited by 16 publications

References 22 publications

Mechanical Characteristics of Cracked Lining Reinforced with Steel Plate–UHPC Subjected to Vertical Load

Mechanical Characteristics of Cracked Lining Reinforced with Steel Plate–UHPC Subjected to Vertical Load

Experimental Study on the Bearing Capacity of Reinforced Concrete Pipes with Corrosion-Thinning Defects Repaired by UHP-ECC Mortar Spraying

Investigation and Calculation Method for the Mechanical Properties of Filament Wound Profiles for Deformed Shield Tunnel Reinforcement

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