Pullout Problem: Stress versus Fracture Mechanical Approach

Stang, Henrik; Li, Z.; Shah, Surendra P.

doi:10.1061/(asce)0733-9399(1990)116:10(2136)

Cited by 120 publications

(48 citation statements)

References 20 publications

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“…Two approaches were proposed by Stang et al (1990), the first based on a "stress criterion" (debonding increases when the maximum bond stress reaches a critical value t y ) and the second based on an "energy criterion" (debonding increases when there is a balance between the energy lost by the system and the energy required by the debonded length to increase, DG). In the following both approaches are used to model size effect in bond.…”

Section: Elastic-fracturing-frictional Modelmentioning

confidence: 99%

“…2, together with the elastic-frictional model proposed by Stang et al (1990), while some results on size effect in smooth and deformed bars are shown in Figs. 3 and 4.…”

Section: Introductionmentioning

confidence: 99%

“…Fig. 2 Qualitative distribution of the bond stress along a smooth, anchored bar, and elastic-fracturing-frictional model (Stang et al, 1990). Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Since the interface is clearly defined in the former case, smooth bars have been investigated more extensively (Bazant and Sener, 1988;Stang et al, 1990;de Larrard et al, 1993;Bazant and Desmorat, 1994;Bazant et al, 1995;Lorrain and Hamouine, 1996), but deformed bars have been studied as well (Soroushian and Choi, 1989;de Larrard et al, 1993;Morita et al, 1994;Lorrain and Hamouine 1996;Elfgren et al, 1995;Esfahani and Rangan, 1998;Yerlici and Ozturan, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…In such a case, however, the barconcrete interface should be considered as a sort of preorientated crack ("interfacial crack", length "a", Fig.2 see also Stang et al, 1990), provided that "cracking" and "fracture process zone" are replaced with "debonding" and "transitional zone", the latter meaning that "hazy" part of the bonded interface, which is at the onset of the frictional slip and where bond is increasingly damaged, but still fairly efficient.…”

Section: Introductionmentioning

confidence: 99%

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Smooth Anchored Bars in NSC and HPC: a Study on Size Effect

Bamonte¹,

Coronelli

Gambarova

2003

ACT

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The bonding of moderately-long anchorages to ordinary and high-performance silica-fume concrete is studied here with reference to size effect. To this purpose, 24 anchorages (L/d b = 10), consisting of a quasi-smooth, micro-roughened bar embedded in a concrete cylinder, were cast and tested up to the pull-out of the bars, which had 4 different diameters (d b = 5, 12, 18 and 26 mm). For each of the 8 cases examined here (4 diameters ¥ 2 mixes), 3 nominally-identical specimens were tested. Though the primary objective of this study is to investigate whether a general-type size-effect law applies to bond in high-performance concrete, the modeling of an anchorage by means of a local elastic-fracturingfrictional bond-slip law is also carried out, and two approaches are adopted for the description of size dependency, the first based on a stress criterion for the debonding, and the second on an energy criterion. The former approach leads to a size-dependent formulation of the local bond strength, while the second approach makes it possible to evaluate the debonding energy, which is size independent. In both approaches the values of the fundamental parameters of the model are identified by means of a bidimensional or mono-dimensional, least-square regression procedure. The results confirm that size effect in bond should be taken into consideration directly in the codes, and pave the way to the study of size effect in high-bond bars.

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Section: Elastic-fracturing-frictional Modelmentioning

confidence: 99%

“…2, together with the elastic-frictional model proposed by Stang et al (1990), while some results on size effect in smooth and deformed bars are shown in Figs. 3 and 4.…”

Section: Introductionmentioning

confidence: 99%

“…Fig. 2 Qualitative distribution of the bond stress along a smooth, anchored bar, and elastic-fracturing-frictional model (Stang et al, 1990). Fig.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Smooth Anchored Bars in NSC and HPC: a Study on Size Effect

Bamonte¹,

Coronelli

Gambarova

2003

ACT

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Micromechanics of Fiber-Reinforced Cementitious Composites

Karihaloo¹,

Wang

2000

Adv. Eng. Mater.

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The strain hardening and tension softening response of short fiber‐reinforced cementitious composites under unidirectional tensile/flexural loading is modelled using concepts from fracture and damage mechanics. The tensile strain hardening in these composites is due to the formation of microcracks which are however prevented from coalescing by the bridging action of the fibers. The density of microcracks increases with increasing tensile/flexural loading until it reaches a saturation level at the tensile load carrying capacity of the composite. Thereafter the fibers progressively debond from the elastic matrix and the deformation begins to localise in the eventual fracture plane, first as unconnected cracks and later as a connected through crack subjected to the residual frictional bridging action by the fibers.

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Advanced Cementitious Composites

2022

Advanced Concrete Technology

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Pullout Problem: Stress versus Fracture Mechanical Approach

Cited by 120 publications

References 20 publications

Smooth Anchored Bars in NSC and HPC: a Study on Size Effect

Smooth Anchored Bars in NSC and HPC: a Study on Size Effect

Micromechanics of Fiber-Reinforced Cementitious Composites

Advanced Cementitious Composites

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