Steel fibers as reinforcement for precast tunnel segments

Plizzari, Giovanni; Tiberti, Giuseppe

doi:10.1016/j.tust.2005.12.079

Cited by 91 publications

(43 citation statements)

References 3 publications

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“…Steel fibers were used to boost the shear capacity of concrete or to partially replace the vertical stirrups in reinforced concrete structural members. This relieved reinforcement congestion at critical sections such as beam-column junctions and tubbing segments [2,6] .The interfacial bond behavior between aggregates and paste for self-compacting concrete (SCC) is better than that for normal concrete, and also the internal defects of SCC are less than that of normal concrete [7,8] . The difference between fiber reinforced SCC (FRSCC) and traditional fiber reinforced concrete (FRC) is that fiber content of FRC is mainly determined by the post cracking behavior, and the fiber content of FRSCC is strongly restricted by the workability of fresh SCC.…”

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Replacing stirrups of self-compacting concrete beams with steel fibers

You

Ding

Niederegger

2010

Trans. Tianjin Univ.

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Abstract：Based on the investigation of fiber influence on workability of self-compacting concrete (SCC), tests were carried out on two series of SCC rectangular simply supported beams, which were made of hooked steel fibers reinforced concrete with or without stirrups, subjected to four-point symmetrically placed vertical loads. The major test variables are steel fiber contents and stirrup ratios. The results indicate that the ultimate load significantly increases with the increase of fiber content; the addition of steel fibers in adequate percentage can change the failure mode from a brittle shear collapse into a ductile flexural mechanism. The stirrups can be partially replaced by steel fibers. The combination of stirrups and steel fibers demonstrated a positive hybrid effect on the mechanical behavior.Diagonal cracks of a reinforced concrete beam occur when the principal tensile stress of concrete within the shear span exceeds the tensile strength of concrete. The addition of steel fibers into a reinforced concrete beam can enhance its shear failure strength, and if sufficient steel fibers are added, a brittle shear failure can be suppressed in favor of more ductile behavior, and crack sizes and spacing can also be reduced [1][2][3][4][5] . Steel fibers were used to boost the shear capacity of concrete or to partially replace the vertical stirrups in reinforced concrete structural members. This relieved reinforcement congestion at critical sections such as beam-column junctions and tubbing segments [2,6] .The interfacial bond behavior between aggregates and paste for self-compacting concrete (SCC) is better than that for normal concrete, and also the internal defects of SCC are less than that of normal concrete [7,8] . The difference between fiber reinforced SCC (FRSCC) and traditional fiber reinforced concrete (FRC) is that fiber content of FRC is mainly determined by the post cracking behavior, and the fiber content of FRSCC is strongly restricted by the workability of fresh SCC. Greenough et al [8] have concluded that FRSCC beams without stirrups displayed superior shear performance compared with that of conventional FRC beams without stirrups, because better workability and the elimination of mechanical vibration led to a more homogeneous dispersion of fibers. The construction period and costs as well as the binding of reinforcement may be significantly reduced by using FRSCC. FRSCC can also be easily placed in thin or irregularly shaped sections, where it may be very difficult to place stirrups. The investigation on FRSCC is a new development trend, which has advantages of both SCC and FRC. However, the study on FRSCC beams is still limited.In this paper, the results on shear behavior of steel fiber reinforced SCC beams are presented. The main purpose of the test program is to evaluate the possibility of replacing stirrups with steel fibers, and to analyze the influence of steel fiber on failure mode. 1 Test program Beam geometry and setup descriptionTwo series of steel fiber reinforced SCC beams (SFSCCBs...

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Replacing stirrups of self-compacting concrete beams with steel fibers

You

Ding

Niederegger

2010

Trans. Tianjin Univ.

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“…The ground structure interaction is considered by means of three different sets of spring elements placed in radial, tangential and longitudinal directions (Blomet al, 1999;Plizzari and Tiberti, 2006;Arnau and Molins, 2011). Unilateral response is adopted in radial springs in order to avoid tensile forces between the ground and the structure.…”

Section: Ground-structure Interactionmentioning

confidence: 99%

Theoretical and numerical analysis of the three-dimensional response of segmental tunnel linings subjected to localized loads

Arnau

Molins

2015

Tunnelling and Underground Space Technology

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Segmental tunnel linings present a significant 3D response when they are subjected to localized loads or to other scenarios that produce different deformations of adjacent rings. The present paper analyzes the interaction mechanisms mobilized in such conditions, determining the most influence parameters and their repercussion on the structural response of the lining. A complete set of numerical analyses is carried out on a complex 3D numerical model that accurately reproduces a real tunnel section on multiple scenarios. Numerical results show the structural benefits of the lining three-dimensional response when subjected to localized loads, allowing the determination of the influence presented by the main involved parameters. The surrounding ground stiffness determines the interaction degree achievable between adjacent rings, whilst lining longitudinal compression determines the maximum load for which a complete interaction is produced.

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“…In some applications, such as precast tunnel segments, the possibility of totally or partially replace the traditional reinforcement with FRC allows several advantages not only in terms of cost reduction but also related to an increase of the quality and structural performance [32,26,9,15,10,29].…”

Section: Introductionmentioning

confidence: 99%