Design procedure for precast fibre‐reinforced concrete segments in tunnel lining construction

Carlo, Fabio Di; Meda, Alberto; Rinaldi, Zila

doi:10.1002/suco.201500194

Cited by 38 publications

(19 citation statements)

References 15 publications

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“…The empirical models are further validated using data from a total of 39 bending tests conducted by Soetens and Matthys, Amin et al, and Grimaldi et al on SFRC with single hook steel fibers. With several researchers requiring the results from bending tests to establish the constitutive relation for SFRC in tension, the proposed empirical equations for the residual flexural strengths are useful for determining the same without the effort of conducting prism tests.…”

Section: Introductionmentioning

confidence: 99%

Residual flexural strengths of steel fiber reinforced concrete with multiple hooked‐end fibers

Venkateshwaran

Tan

2017

Structural Concrete

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This paper presents the results of 3-point bending tests on 69 prenotched steel fiber reinforced concrete (SFRC) prisms conducted in accordance with EN 14651 to obtain the stress versus crack-mouth-opening displacement curves. SFRC prisms with fiber content greater than 20 kg/m 3 and containing multiple hooked-end fibers were found to exhibit deflection hardening behavior in bending after first crack. Based on the test results, empirical models to determine the residual flexural stresses are established through multiple regression analysis and further validated with test results available in the literature. The residual flexural strengths were found to be proportional to the reinforcing index, the square root of concrete compressive strength, and the square of the number of hooks at the fiber ends. Size effect is accounted for by introducing a factor which is a function of the fiber length. The empirical equations for the residual flexural strengths enable the use of Model Code 2010 constitutive relation for SFRC in tension without resorting to prism tests.hooked-end fibers, limit of proportionality, reinforcing index, residual flexural strengths, steel fiber reinforced concreteIn the early development, short discrete steel fibers have been used mainly for crack and shrinkage control in concrete members. 1 Studies have also showed that steel fibers significantly enhance the tensile and flexural strength of concrete. [2][3][4][5][6] The mechanical properties of steel fiber reinforced concrete (SFRC) are governed by the compressive strength of the matrix and the fiber reinforcing index (RI), defined as the product of volume fraction and aspect ratio of fibers. [6][7][8][9] Several types of steel fibers are available in the market. They include straight, crimped, twisted, and hooked-end steel fibers. Four-point bending tests on SFRC beams have indicated that hooked-end fibers provide higher flexural strength and toughness compared to wavy fibers. 10 This, in addition to workability issues with twisted fibers, has led to the popularity of hooked-end steel fibers in applications such as slab-on-piles and slab-on-grade systems. 11 Latest developments in the steel fiber industry have led to the manufacture of fibers with multiple hook-ends, that is, fibers having single, 1.5, and double hook-ends. 12 These fibers possess greater anchorage and stress transfer capability, and are expected to enhance the flexural performance of SFRC members.In order to predict the flexural capacity of SFRC elements, constitutive relations of SFRC in tension is essential and several models had been proposed. [13][14][15][16][17][18] The tensile stress distribution across a SFRC section at ultimate limit state is related to the residual (post-crack) flexural strength. According to EN, RILEM, and American Standard for Testing Materials (ASTM) test standards, 18-21 the residual flexural strength of SFRC is determined from the stress versus crack-mouth-opening displacement (CMOD) or stress versus deflection curves obtained from 3-point or 4-poi...

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Section: Introductionmentioning

confidence: 99%

Residual flexural strengths of steel fiber reinforced concrete with multiple hooked‐end fibers

Venkateshwaran

Tan

2017

Structural Concrete

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“…At the same time the material of station is reinforced concrete with following data: the modulus of elasticity and density of reinforced concrete structure are 31500 MPa, 0.025 MN/m 3 , the density and friction angle of soil are 0.018 MN/m 3 , 26°. For physical modeling of station we are used the shell triangular finite element with 5 degrees of freedom at each node [13][14][15].…”

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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“…Studies in the literature reveal that there is not a clear consensus to specify and researchers use different criteria to determine its value [16]. However, the MC2010 suggests considering to be equal to the depth of the structural element to be designed, a criteria that has been used and validated by several authors [17,18].…”

Section: Figure 1 Constitutive Law For Frc In Tensionmentioning

confidence: 99%

Design-oriented approach to determine FRC constitutive law parameters considering the size effect

Galeote

Blanco

Fuente

2020

Composite Structures

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Tensile strength constitutive laws for fibre reinforced concrete (FRC) are commonly defined through the parameters of flexural tests conducted on standard prismatic specimens. However, there are no specific criteria to determine such parameters using small specimens that could simplify the testing procedure and provide more representative results of slender structural FRC elements. In this line, the influence of size effect becomes an issue particularly relevant during the characterisation stage given that the residual strength decreases while increasing the size of the element. The objective of this document is to propose a methodology to obtain the parameters of the constitutive law using small specimens. For this, FRC residual strength was determined through three-point bending tests on prismatic notched beams of 40x40x160,

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Design procedure for precast fibre‐reinforced concrete segments in tunnel lining construction

Cited by 38 publications

References 15 publications

Residual flexural strengths of steel fiber reinforced concrete with multiple hooked‐end fibers

Residual flexural strengths of steel fiber reinforced concrete with multiple hooked‐end fibers

Numerical approach for structural analysis of Metro tunnel station

Design-oriented approach to determine FRC constitutive law parameters considering the size effect

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