Precast tunnel segments with GFRP reinforcement

Caratelli, Angelo; Meda, Alberto; Rinaldi, Zila; Spagnuolo, Simone

doi:10.1016/j.tust.2016.07.011

Cited by 48 publications

(16 citation statements)

References 9 publications

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“…The trough part can be made as precast or precast-monolithic structure [8][9][10]. Prefabricated elements are connected by welding of reinforcement outlets with formwork concreting as the result of which the seismic belt of high rigidity is created [11,12]. However, the vault can be rigidly or hingedly supported on strengthened heel of plate (trough part).…”

Section: Fig 2 General View Of Stationmentioning

confidence: 99%

Numerical approach for structural analysis of Metro tunnel station

et al. 2021

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In this paper is presented the results of calculations of reinforced concrete structure of metro station in the form of cupola located at the intersection of interstation tunnels. The constructive solution of station is economical, allows diversifying its architecture and using the internal space for placing objects of the national economy. One of the important design stages is the assessment of the stress-strain state of structure with different boundary conditions when it is exposed to external loads. It is assumed that deformable environment surrounding the tunnel station is elastic and is modeled by discrete bearing reaction located in contact with the station. The structure is modeled by finite shell elements. As the result of calculation the principal stresses and moments in its sections are determined. The obtained data can be made by designers in determining of structural solution, dimensions and initial sections selection of reinforcement elements.

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Section: Fig 2 General View Of Stationmentioning

confidence: 99%

Numerical approach for structural analysis of Metro tunnel station

et al. 2021

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“…Therefore, in the process of design, construction, and operation of shield tunnels, it is necessary to investigate how to reduce the static and dynamic loads of segmental linings. By combining the research and analysis [4,6,9], the static loads of segmental linings are only related to the environment around. The dynamic loads of segmental linings, for the upper high-speed railway load, are only related to the depth of segmental linings, the axle loads, and the speed of the train.…”

Section: Fatigue Loads Analysis Of Segmental Lining Structurementioning

confidence: 99%

“…Aimed at static-dynamic response and fatigue characteristics of tunnel support structures, relevant researches have been carried out both domestically and abroad. Caratelli [6] and Xue [7] studied the variation characteristics of segmental lining under static and dynamic loads, respectively, and analyzed differences between two types of loads from the crack development and structural displacement deformation. Based on safety assessments of tunnels constructed by shield driving method, under the long-term action of staticdynamic loads, there is a very different form of fatigue failure rather than general damage caused by short-term static loads, which causes rapid expansion and penetration of internal cracks, reduces the bearing capacity of structure, leads to excessive deformation, and directly affects the service life of tunnels [8,9].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life Characteristics of Segmental Lining Structure for the Shallow Buried Metro Tunnel under the Dynamic Load of a High-Speed Railway

Qian

Zhao

et al. 2018

Mathematical Problems in Engineering

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Shallow buried shield metro tunnels constructed underneath subgrade project of high-speed railways are becoming increasingly common in China, but the lower metro tunnel bears the fatigue effect of dynamic load induced by the upper high-speed railway, so the long-term durability of segmental lining is a nonnegligible problem. The segmental lining structure of metro tunnel is in a state of static-dynamic loads for a long time, especially when a high-speed railway passes above the metro line, and the long-term durability of segmental lining needs further research. Based on theoretical analysis, the effect of different forms of loads on the fatigue life was analyzed, the change law of the static-dynamic loads on segmental lining was summarized, and the method was put forward to evaluate the fatigue life characteristics of segmental lining. The research results reveal that the additional dynamic load is the fundamental reason for the fatigue failure of the structure, and the existence of static load can cause and accelerate the occurrence of structural fatigue failure simultaneously. The results indicate that the fatigue life decreases gradually with the increase of static-dynamic load. Based on coupling analysis of static-dynamic loads of segmental lining, the fatigue life increases first and then decreases with the increase of buried depth of metro tunnel, and it remains unchanged when the depth exceeds a certain value. According to the actual metro tunnel engineering, by using ABAQUS software, a three-dimensional numerical simulation was carried out to analyze the characteristics of the fatigue life and evolution rules of segmental lining. Based on the modified fatigue life formula and metro service life, the optimization design of the buried depth was carried out to determine the most reasonable range of the buried depth. This study provides a valuable reference for safe operation and long-term durability of metro tunnels under high-speed railways.

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“…A remarkable advantage of synthetic reinforcement (either fibres or rebar) is in terms of corrosion resistance against aggressive environment especially for hydraulic tunnels (Caratelli et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Experimental campaigns using glass fibre reinforced polymer (GFRP) rebar (Caratelli et al, 2016(Caratelli et al, , 2017Spagnuolo et al 2017) concluded that there were no significant differences with steel rebar reinforcement on the flexural behaviour point of view and exhibited a better performance in terms of cracking reduction under concentrated loads. When a better flexural performance is required, GRFP rebar can be combined with SFRC (Meda et al, 2018).…”

Section: Introductionmentioning

confidence: 99%