Pull-out behaviour of straight and hooked-end steel fibres under elevated temperatures

Abdallah, Sadoon; Fan, Mizi; Cashell, Katherine A.

doi:10.1016/j.cemconres.2017.02.010

Cited by 42 publications

(17 citation statements)

References 17 publications

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“…The pullout tests of the steel fibres orientated at 60 • and 90 • with an embedded length of 6.50 mm showed the typical course of a standardized bond test of conventional reinforcement, i.e., they reached the maximum pullout resistance relatively quickly and then dropped almost linearly. Many contributions ( [11,16,20,21]) observed similar phenomena but only for 90 • -orientated fibres.…”

Section: Monotonic Tensile Loadingmentioning

confidence: 80%

Fundamental Investigations on the Performance of Micro Steel Fibres in Ultra-High-Performance Concrete under Monotonic and Cyclic Tensile Loading

Lanwer

Empelmann

2021

Applied Sciences

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: Ultra-high-performance fibre-reinforced concrete (UHPFRC) can preferably be used for lean and thin-walled structures due to its very high compressive strength. Based on the adverse relation between the increased load bearing capacities and the condensed dead weight of UHPFRC-structures, the impact of live loads in the design gets bigger and, in case of traffic loads, the effects of a cyclic loading have to be considered in more detail. In this context, this study investigated the material behaviour of UHPFRC, especially the tensile fatigue behaviour of high-strength micro steel fibres and the bond behaviour between those fibres and plain UHPC. The test programme included once tensile tests of high-strength micro steel fibres under monotonic and cyclic loading. Based on the test results, an S/N-curve was set up with the characteristic values. Furthermore, the test programme included pullout tests of fibre groups with different embedded lengths and orientations under monotonic and cyclic loading. It was observed that some fibres rupture under certain test configurations like the angle of orientation and the load amplitude.

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Section: Monotonic Tensile Loadingmentioning

confidence: 80%

Fundamental Investigations on the Performance of Micro Steel Fibres in Ultra-High-Performance Concrete under Monotonic and Cyclic Tensile Loading

Lanwer

Empelmann

2021

Applied Sciences

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“…The post-cracking behaviour of SFRC is closely related to the bond characteristics between the fibre and the matrix (Won et al 2013;Abdallah et al 2017c, d). The efficiency of fibres in bridging cracks depends upon the bond mechanisms associated with the pull-out behaviour (Islam and Alam 2013;Li and Liu 2016;Abdallah et al 2017b). Tensile stress in the concrete matrix is transferred to the fibre through a characteristic durable bond at their interface.…”

Section: Introductionmentioning

confidence: 99%

Comparisons Between Pull-Out Behaviour of Various Hooked-End Fibres in Normal–High Strength Concretes

Abdallah

Rees

2019

Int J Concr Struct Mater

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In this paper an elastic-plastic response has been developed to predict the pull-out behaviour of various hooked end fibres embedded in normal-high strength concretes. An elastic-plastic moment expression has been proposed to represent the partially plastic hinge formed during pull-out. The proposed formula has been incorporated into a frictional pulley force analysis in order to predict the applied loading at each stage of pull-out. This prediction accounts for the variation of geometrical and tensile properties of the fibres as well as concrete strength. The proposed model is validated against experimental pull-out results of various hooked end fibres.

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“…Of these, the interfacial bond characteristics between fibre and matrix play a crucial role in controlling the overall behaviour of the composite. Pull-out testing of straight and hooked end fibres embedded in a concrete matrix has accompanied this relatively new method of reinforcement [4]. Short fibre, randomly distributed offers resistance to tensile failure in concrete structures quite apart from the traditional reinforcing bars for beams.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Pull-Out Behaviour of Straight and Hooked End Steel Fibres

Abdallah¹,

Rees²

2019

ENG

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The effective utilisation of steel fibre reinforced concrete (SFRC) requires in-depth and detailed understanding of bonding mechanisms governing the tensile behaviour. In response to this demand, this study presents an empirical description of the axial force required to pull out a hooked end steel fibre from a cementitious matrix. It is based upon consistent experimental tests that show the force versus displacement plot is formed from a sequence of events in which partial and full debonding at the interface is followed by bending of the hook knee to raise the force to its maximum. A loss of peak force occurs with the reversed plasticity involved in a full straightening of the fibre that precedes the rapid sliding to its full removal under a falling force. The stages are assembled in the said order with a piecewise connection between linear segments and a curve of exponential decay. A power law can be introduced to describe the knee bending stage if preferred. The normalised co-ordinates were adopted for the simple mathematical discontinuous function of the full pull-out process. Normalising force and displacement for hooked fibre is based upon the maximum values found for straight fibre pull out. This would apply to an overall embedded length of unity and a unit peak force for a full debonding of straight fibre in similar materials. For hooked fibre the normalised co-ordinates given refer to the initiation and duration of each event to be tabulated at fractions of the embedded length with multiples of that force. Such predictions are seen to be in good agreement with average pull-out response curves.

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Pull-out behaviour of straight and hooked-end steel fibres under elevated temperatures

Cited by 42 publications

References 17 publications

Fundamental Investigations on the Performance of Micro Steel Fibres in Ultra-High-Performance Concrete under Monotonic and Cyclic Tensile Loading

Fundamental Investigations on the Performance of Micro Steel Fibres in Ultra-High-Performance Concrete under Monotonic and Cyclic Tensile Loading

Comparisons Between Pull-Out Behaviour of Various Hooked-End Fibres in Normal–High Strength Concretes

Analysis of Pull-Out Behaviour of Straight and Hooked End Steel Fibres

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