Analytical simulation of pull-out tests––the direct problem

Banholzer, B.; Brameshuber, Wolfgang; Jung, Wolf

doi:10.1016/j.cemconcomp.2004.01.006

Cited by 82 publications

(46 citation statements)

References 9 publications

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“…Additionally, the withdrawal of water interferes with cement hydration (Tamba et al 2001), resulting in a weakened interface. The interface of the wood and the cement has to be imagined as a thin transition zone possessing neither the properties of the cement nor those of the wood strand (Banholzer et al 2005). Due to the influence of the wood, this zone can include substantial imperfections concerning mechanical properties.…”

Section: Discussionmentioning

confidence: 99%

“…Due to one-sided bonding and the resulting eccentric load transmission, shear stress is superimposed by a bending moment. Tension-induced contraction will lead to additional lateral strain at the interface (Banholzer et al 2005), and Poisson contraction will reduce the frictional stress during pull-out (Takaku and Arridge 1973). An implication out of these results is that a rough surface can partially transform tangential acting shear forces into normal forces due to increased elevations and valleys in the strand.…”

Section: Discussionmentioning

confidence: 99%

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Investigation of the Mechanical Interactions at the Interface of Wood-Cement Composites by Means of Electronic Speckle Pattern Interferometry

Frybort¹,

Mauritz²,

Teischinger³

et al. 2012

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This study investigates the bonding behaviour of Norway spruce wood strands to a surrounding cement matrix. Effects of wood swelling and shrinking during cement curing were studied by using strands of various thicknesses. The deformation of the spruce wood strands and the surrounding cement matrix, as well as the interface between the wood and the cement were examined using Electronic Laser Speckle Interferometry (ESPI) while applying a pull-out load. Sample deformation was transformed to shear strain maps, showing which side of the strand was tightly bonded to the cement matrix. The analysis of the strain maps proved that all strands were tightly bonded to the cement matrix on only one side. No shear deformation was observed on the loosely bonded side, meaning that there was no adhesion on that side between the wood strand and the cement matrix. Manufacturing of strands results in different surface characteristics and surface roughness. Bringing together the ESPI results with the roughness measurements, it was shown that only the comparably rougher surface adheres to the cement matrix. In a cement bonded composite (CBC) made of lignocellulosics to a greater or lesser extent, only half of the contact area is therefore able to transfer load.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Investigation of the Mechanical Interactions at the Interface of Wood-Cement Composites by Means of Electronic Speckle Pattern Interferometry

Frybort¹,

Mauritz²,

Teischinger³

et al. 2012

BioResources

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show abstract

“…In this case, various models and numerous methodologies have been published by Gan (2000), Banholzer et al (2005), and Dominguez (2005), but few works have been presented treating the cracked flexural reinforced concrete members by Au, Bai (2007) and Nayal, Rasheed (2006). For this raison, a particular importance has been given to this kind of work.…”

Section: Proposed Tension Stiffening Bond Model Of Cracked Flexural Mmentioning

confidence: 99%

“…Recently, the development of analytical expressions to predict the bond stress-slip responses of flexural reinforced concrete structures is an important topic of research. Therefore, many analytical and numerical models have been developed to yield the bond stressslip response of tensile reinforced concrete members (Redzuan 2004;Kwak, Kim 2004;Khalfallah 2006;Banholzer et al 2005 ;Mutlu, Bobet 2005 ;Ashraf 2005 ;Dominguez 2005). …”

Section: Introductionmentioning

confidence: 99%

Tension Stiffening Bond Modelling of Cracked Flexural Reinforced Concrete Beams/Supleišėjusių Gelžbetoninių Sijų Armatūros Ir Betono Sankibos Modeliavimas

Khalfallah

2008

Journal of Civil Engineering and Management

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Abstract. This paper deals with the analysis of cracked flexural reinforced concrete structures with special highlighting of modelling the interaction between concrete and reinforcement. A new approach based on the bond stress distribution through the transfer length between the zero-slip and the cracked sections is proposed. Since the cracking phenomenon of concrete occurs, the fracture energy changes in order to appeal to the interaction between concrete and steel. The increment of stresses is evaluated by the bond-slip distribution by means of one-dimensional problem. Besides, the 2D nonlinear description of components behaviour, concrete and steel are considered. On numerical modelling level, the interaction property is obtained from a variety of fundamental pull out and push out tests, for the most part this phenomenon does not very well represent the bending members. For this object, this study presents a numerical approach, which can compute the distribution stresses at the steel-concrete interface near flexural crack in reinforced concrete beams. Finally, predictions made by the non-linear finite element analysis program and the non-linear material models for concrete, reinforcing bars and bond slip are in good agreement with the experimental results.

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“…Ones of the most widely used bond stress-slip relationship is proposed by Ciampi et al [2] and Eligehausen et al (1983) [3]. More, many researchers have developed analytical and numerical models yielding to stress-slip response and bond stress distribution of reinforced concrete members [4][5][6][7][8][9][10][11][12][13]. The common object is to have a reliable analysis that takes into account the effective behavior of the composite reinforcedconcrete structures.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Bond Between Steel and Concrete by Numerical Analysis

Khalfallah¹,

Ouchenane²

2008

TOCIEJ

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This paper presents the results of subtask dealing with the bond behavior study of the reinforcement systems under monotonic loading pull-out tests. This numerical method is based on the slip and the bond stress distributions through the anchored length of the bar in the concrete block. The work refers, especially to the implementation of reinforcing bars and bond-slip models between steel and concrete in the developed finite element program. For the application of the proposed method, three analytical expressions of bond-slip relationship are selected. The obtained results are presented and commented with the fundamental characteristics of plain concrete and reinforced concrete members. The bond models in contribution with concrete and reinforcing steel provide a relativity good representation of bond-zone system responses.

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Analytical simulation of pull-out tests––the direct problem

Cited by 82 publications

References 9 publications

Investigation of the Mechanical Interactions at the Interface of Wood-Cement Composites by Means of Electronic Speckle Pattern Interferometry

Investigation of the Mechanical Interactions at the Interface of Wood-Cement Composites by Means of Electronic Speckle Pattern Interferometry

Tension Stiffening Bond Modelling of Cracked Flexural Reinforced Concrete Beams/Supleišėjusių Gelžbetoninių Sijų Armatūros Ir Betono Sankibos Modeliavimas

Prediction of Bond Between Steel and Concrete by Numerical Analysis

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