Bond between deformed reinforcement and normal and high-strength concrete with and without fibers

Dancygier, Avraham N.; Katz, Amnon; Wexler, Uri

doi:10.1617/s11527-009-9551-6

Cited by 83 publications

(21 citation statements)

References 7 publications

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“…After splitting, the confining action along the anchored bars or splices is produced by transverse reinforcement (Eligehausen et al, 1983), by external transverse pressure and by cohesive stresses between the splitting crack faces (Darwin et al, 1992;Reinhardt and van der Veen, 1990;Walker et al, 1999;Xu et al, 2011). The latter confining action underlines the potential benefit of fibre reinforcement in concrete (Harajli et al, 1995;Jansson et al, 2012), even though recent studies have shown that the addition of fibres can cause a reduction in bond strength due to disturbance in the concrete matrix near the bar ribs (Dancygier and Katz, 2010).…”

Section: Introductionmentioning

confidence: 99%

Influence of the relative rib area on bond behaviour

Metelli

Plizzari

2014

Magazine of Concrete Research

118

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Steel-to-concrete bond is a basic aspect of the behaviour of reinforced concrete structures both at serviceability and ultimate states. When bond rules were originally developed, experimental results were mainly obtained on normalstrength concrete and a minimum relative rib area (bond index) was required by building codes to ensure good bond properties. The arrival into the market of high-performance concrete and newer structural needs may require different bond indexes. In the present paper, the experimental results of pull-out tests on short anchorages are presented. Several pull-out tests on ribbed bars, embedded in cubes of normal-and high-strength concrete with a concrete cover of 4 . 5 times the bar diameter, were carried out in order to better understand the influence of the relative rib area and bar diameter on the local bond behaviour, as well as on the splitting crack width generated by the wedging action of ribs. A total of 96 tests were performed on machined bars of three different diameters (12, 16 and 20 mm) with a bond index ranging from 0 . 040 to 0 . 105. The results of 55 pull-out tests on commercial hot-rolled ribbed bars of four different diameters (12, 20, 40 and 50 mm) are also presented to confirm that the bond response also depends on bar diameter (size effect). Experimental results provide information concerning the influence of the relative rib area on bond strength and on the bursting force due to the rib's wedge action. As the minimum measured bond strength of rebars was always markedly greater than the minimum bond strength required by building codes even when low bond indexes were adopted, the test results point out the possibility of reducing the minimum value of the relative rib area required by Eurocode 2 without limiting the safety coefficient of bond. The reduction also allows a higher structural ductility that can be achieved due to a greater strain penetration of the rebars from concrete cracks.

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Section: Introductionmentioning

confidence: 99%

Influence of the relative rib area on bond behaviour

Metelli

Plizzari

2014

Magazine of Concrete Research

118

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“…Their effect on bond performance is especially 26 noticeable in terms of toughness of bond failure and the ductility of the material [10,16]. 27…”

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confidence: 99%

Bond of reinforcing bars to steel fiber reinforced concrete

García-Taengua

Martí‐Vargas

Ros

2016

Construction and Building Materials

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“…Thus it was found that such enhanced properties lead to an increase in the bond between steel fiber reinforced concrete and deformed steel bar [8,11,15,18,21,30]. Concerning the bond behaviour of rebar embedded into UHPFRC, some experimental programs have been carried out previously [1,7,17,19,22,26,31,36].…”

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confidence: 99%

Bond behaviour of reinforcing bars in UHPFRC

et al. 2015

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This paper deals with the experimental determination of the bond behaviour between ultra-high performance fiber-reinforced concrete (UHPFRC) and reinforcing bars (rebars). An experimental campaign has been carried out to assess the bond behaviour considering different rebar diameters, different embedment lengths and different concrete covers. A relationship between bond strength, compressive strength and rebar diameter has been drawn from the results of this campaign and results found in the literature. Thanks to an original instrumentation method using Fiber-Optic Sensor, the local constitutive law linking the local relative displacement between UHPFRC and rebar and the bond stress has been determined and compared with the law proposed by fib Model Code 2010.

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Bond between deformed reinforcement and normal and high-strength concrete with and without fibers

Cited by 83 publications

References 7 publications

Influence of the relative rib area on bond behaviour

Influence of the relative rib area on bond behaviour

Bond of reinforcing bars to steel fiber reinforced concrete

Bond behaviour of reinforcing bars in UHPFRC

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