Numerical analysis and experimental testing of ultra-high performance fibre reinforced concrete keyed dry and epoxy joints in precast segmental bridge girders

Gopal, Balamurugan A.; Hejazi, Farzad; Hafezolghorani, Milad; Lei, Voo Yen

doi:10.1007/s40091-019-00246-6

Cited by 21 publications

(11 citation statements)

References 16 publications

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“…This can be done by carrying out a material calibration for a single element and structure (beal in bending in our case). To study with precision, the shear behavior of joints in segmental bridges prefabricated in ultra performance fiber-reinforced concrete (Gopal et al , 2019) opted for the CDP model. They simulated the inelastic behavior of fiber concrete under compression and traction plan loadings.…”

Section: Modelingmentioning

confidence: 99%

“…They simulated the inelastic behavior of fiber concrete under compression and traction plan loadings. Based on the good results of these studies (Tysmans et al , 2015; Singh et al , 2017; Solhmirzaei and Kodur, 2017; Gopal et al , 2019), we adopted the CDP model available in Abaqus and used it to reproduce the behavior of CC and fibers reinforced concretes.…”

Section: Modelingmentioning

confidence: 99%

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Modeling the contribution of tire-reclaimed and industrial steels fibers on the strength and ductility of RC-frames structures

Talbi

Nekmouche²,

Ouali

et al. 2022

WJE

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Purpose This paper aims to model the performances of frames structures by comparing the predictions of ordinary control concrete (CC) and concretes reinforced by fibers. Two types of steel fibers were used in this work, industrial steel fibers (ISF) and tire-reclaimed fibers obtained by cutting virgin steel tire-cord to 50 mm, noticed virgin steel fibers (VSF). In total, 3% of VSF are used. The results obtained in this paper clearly show the contribution of fibers in improving the global and local behavior of the frames structures. VSF gives the same or better overall behavior as the use of industrial fibers for the same percentage of fibers, with the advantage that VSF contributes to the protection of the environment and limit the wastage of steel. Design/methodology/approach This work was carried out using the commercial finite element code Abaqus/Explicit. The behavior of the different concretes used in this study was modeled by the concrete damage plasticity (CDP) constitutive law. The methodology adopted to complete this work consisted in identifying, by calibration of the available experimental results with the numerical predictions, the parameters of the corresponding CDP model for each of the concretes used in this work. To this end, the authors have successively identified the CDP parameters for the CC-V (control concrete used by Vecchio and Emara, 1992) used in frame structure (R + 1). Subsequently, the CDP parameters of the CC-T (control concrete used by Tlemat, 2004), the CVSF (concrete with virgin steel fibers) and the CISF-1 (concrete with industrial steel fibers type 1, ISF-1) are identified using the experimental results of beams under bending tests. Once the model parameters were determined for each concrete, the authors conducted a series of simulations to show the benefit of introducing claimed and industrial fibers in frame structure (R + 1) and (R + 2). This approach recommends the use of concrete reinforced with steel fibers, mainly 6% by mass of VSF and ISF-1, in place of ordinary concrete in new construction to increase the resistance of structures and contribute, if applicable, to the protection of the environment. Findings The main findings of this study can be summarized by: the strength and ductility of the frames structures made of concrete fiber are significantly increased. The use of tire-reclaimed steel fibers (VSF) gives the same or better overall behavior as the use of industrial fibers. In addition to their good mechanical contribution, the tire-reclaimed fibers contribute to the protection of the environment and limit the wastage of steel. The use of fibers reduces the cracking zones in concrete fiber frames structures. The usefulness of distinguishing the interstory displacement limits set by codes, in particular, uniform building code (UBC-97), for ordinary concretes and concrete reinforced with fibers is addressed. Originality/value The contribution of tire-reclaimed and industrial fibers on the strength and ductility of reinforced concrete-frames structures is addressed. The use of tire-reclaimed steel fibers gives the same or better overall behavior as the use of industrial fibers, the tire-reclaimed fibers having the advantage of contributing to the protection of the environment and limiting the wastage of steel. The paper also points to the usefulness of distinguishing the interstory displacement limits set by codes, in particular UBC-97, for ordinary concrete and concrete reinforced with fibers, in accordance to the predictions of the capacity curves.

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Section: Modelingmentioning

confidence: 99%

Section: Modelingmentioning

confidence: 99%

Modeling the contribution of tire-reclaimed and industrial steels fibers on the strength and ductility of RC-frames structures

Talbi

Nekmouche²,

Ouali

et al. 2022

WJE

View full text Add to dashboard Cite

show abstract

“…There was no direct relationship between bonding strength and adhesive layer thickness. However, in the subsequent studies, Gopal B A et al [ 26 ] conducted parametric studies on the influence of the number of shear keys, lateral stress, node type, and other factors on the shear capacity of joints. The results showed that the bearing capacity of UHPFRC bond joints increased with the increase of the horizontal pressure (confining pressure) applied to the joints, the number of shear keys, and the thickness of epoxy resin used on the joints.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Shear Performance of Epoxy Adhesive Joints of Prefabricated Elements Made of Ultra-High-Performance Concrete

Zhang

Zou

et al. 2022

Polymers

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Application of ultra-high-performance concrete (UHPC) in joints can improve the impact resistance, crack resistance, and durability of structures. In this paper, the direct shear performance of ultra-high-performance concrete (UHPC) adhesive joints was experimentally studied. Twenty-four direct shear loading tests of UHPC adhesive joints were carried out considering different interface types and constraint states. The failure modes and load-slip curves of different interfaces were studied. Results indicated that passive confinement could enhance the strength and ductility of the interface; the average ultimate bearing capacity of the smooth, rough, grooved, and keyway specimens with passive restraint were, respectively, increased by 11.92%, 8.91%, 11.93%, and 17.766% compared with the unrestrained ones. The passive constraint force changes with the loading and finally tends to be stable. The epoxy adhesive has high reliability as a coating for the UHPC interface. The adhesive layer is not cracked before the failure of the specimen, which is also different from the common failure mode of adhesive joints. Failure of all specimens occurred in the UHPC layer, and the convex part of the groove interface shows the UHPC matrix peeling failure; the keyway interface is the shear damage of the key-tooth root, and the rest of the keyway showed UHPC surface peeling failure. According to the failure mode, the shear capacity of UHPC keyway adhesive joints under passive restraint is mainly provided by the shear resistance of key teeth, the friction force of the joint surface, and the bonding force of the UHPC surface. The friction coefficient was determined based on the test results, and the high-precision fitting formula between the shear strength of the UHPC surface and the passive constraint force was established. According to the Mohr stress circle theory, the proposed formula for direct shear strength of UHPC bonded joints under passive constraint was established. The average ratio of the proposed UHPC adhesive joint calculation formula to the test results was 0.99, and the standard deviation was 0.027.

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“…e experimental results of Smittakor et al [10] showed that steel fiber could improve the shear resistance of concrete keyed joints. Gopal et al [11] found that the shear bearing capacity of ultra-high-performance fiber reinforced concrete (UHPFRC) key joints increased significantly with the number of keys. Kim et al [12] conducted direct shear experiments on the joints of ultra-high-performance concrete (UHPC) and concluded that the failure load gradually increased with the number of keys.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics of Steel Shear Keyed Joints in the Construction and Finished States

Zou

2021

Advances in Civil Engineering

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Joints that represent locations of discontinuity were the prominent factors affecting the overall behavior of precast segmental bridges. In this study, the steel shear key was designed, which was used to transmit the shear stress of the joints. To study the mechanical characteristics of the steel shear keyed joints in the construction and finished states, direct shear experiments and numerical analysis were carried out. The experimental results showed that the steel shear keyed joints had a high bearing capacity and good ductility. Under the action of confining stress, the joints relied on the mechanical occlusion between the steel keys to transmit the shear forces. When the load-displacement curve entered the horizontal stage, it can still bore large relative deformation, and the bearing capacity did not decrease. In the construction state, the inelastic deformation of the steel shear key should be used to control the design value of the temporary load. In the finished state, the bearing capacity of joints should be controlled by the direct shear strength of the steel shear key, which can be calculated according to the shear formula. The shear strength of the material and size of the steel shear key are the main factors affecting the bearing capacity of steel shear keyed joints.

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Numerical analysis and experimental testing of ultra-high performance fibre reinforced concrete keyed dry and epoxy joints in precast segmental bridge girders

Cited by 21 publications

References 16 publications

Modeling the contribution of tire-reclaimed and industrial steels fibers on the strength and ductility of RC-frames structures

Modeling the contribution of tire-reclaimed and industrial steels fibers on the strength and ductility of RC-frames structures

Interfacial Shear Performance of Epoxy Adhesive Joints of Prefabricated Elements Made of Ultra-High-Performance Concrete

Mechanical Characteristics of Steel Shear Keyed Joints in the Construction and Finished States

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