A multi-layer parallel crack extension model for deformational response of post-installed anchor

Saleem, Muhammad; Qazi, Asad Ullah; Hameed, Asif; Bashir, Muhammad Aun

doi:10.1007/s12205-013-0014-9

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…This results in increasing the failure path length by 80 % and increase in energy absorption capacity by 24 %. The pull-out load also increases by 16 % but this phenomenon is mainly associated with the simultaneous crack extension [6].…”

Section: Two-layer Anchor-infill Assembly: Effectivenessmentioning

confidence: 97%

“…Using the typically employed geometrical parameters, the r/L ratio is taken as 1/40, where r is the radius of the anchor bar taken equal to 19 mm and L is the embedment length taken equal to 20 times diameter of the bar, d b . The elastic modulus ratio of anchor to infill E a /E I is taken equal to 10, and E I /q y I is taken equal to 30 where q y I is the yield strength of the infill layer [3][4][5][6]. The typical loading history employed for this purpose has been shown in Fig.…”

Section: Cyclic Rulesmentioning

confidence: 99%

“…Research has been carried out on these anchors for much time; however, very little attention in the past has been focused on the anchor-infill assembly structure, which can be modified to control the deformational response of the postinstalled anchor bar. A new type of anchor-infill assembly model has been developed by the author [3][4][5][6][7] where the infill material has been divided into two layers for the purpose of providing a larger failure path length, which results in larger energy absorption capacity during the cyclic response of the post-installed anchor bar. Once the single interface has debonded, the adjacent second infill interface becomes active during push-in loading cycle and helps in providing a larger failure path length resulting in increased energy absorption.…”

Section: Introductionmentioning

confidence: 99%

“…The infill material has been divided into two layers where the anchor bar in center is surrounded by the nonlinear deformable infill material followed by the first hollow steel cylinder and the second nonlinear deformable infill layer and second hollow steel cylinder. The purpose of dividing the infill material in two layers is to provide a larger failure path length, which would result in a larger energy absorption and load capacity [6] under the action of cyclic loading. The infill material is modeled as a nonlinear deformable infill, while the post-installed anchor bar and the infill steel cases are modeled as elastic materials and the surrounding concrete is assumed to be rigid.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Pull-Out Push-In Shear-Lag Model for Post-installed Anchor-Infill Assembly

Saleem

2014

Arab J Sci Eng

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A cyclic piecewise linear shear-lag material model representing the local bond behavior of the postinstalled anchor-infill assembly used for simulating its cyclic pull-out push-in response is presented. The anchor-infill assembly is such that used in various strengthening techniques to strengthen reinforced concrete structures. The properties of the infill material used for installing post-installed anchor-infill assembly are characterized by a nonlinear interface between the surrounding concrete and the anchor. A new type of anchor-infill assembly is introduced in which the infill material is divided into two layers for the purpose of providing a larger failure path length resulting in increase of the energy absorption capacity. The cyclic response is divided into two categories, namely the one with indentation and the one without indentation, where indentation represents concrete crushing at the base of drilled hole used for installing anchor bar. Each cycle is further subdivided into six paths of elastic loading followed by de-bonding in pull-out direction, unloading, reloading, de-bonding in pushin direction and unloading again. The stiffness degradation upon de-bonding and stiffness recovery upon reloading due to the lateral pressure effect and Poisson's effect is incorporated in the form of stiffness and constant shear force update at the beginning of each loading path. Rules are formulated to plot the cyclic response, by a trial and error approach, to suit the presented material model. The sequential conceptual diagram showing the development of global cyclic loaddisplacement response of the anchor-infill assembly is also presented. Finally, the response of the anchor-infill assembly is plotted using thefinite element method under three dif- M. Saleem (B) ferent support conditions and comparisons are made with the results of numerical rules and good agreement is found. The effectiveness of the proposed two-layer model is also confirmed by comparing its cyclic pull-out push-in response with that of single-interface model, and it is found that the energy absorption capacity increases by 24 % and the failure path length increases by 80 %.Keywords Post-installed anchor-infill assembly · Local bond behavior · Cyclic shear-lag model · Pull-out · Push-in · Lateral pressure · Indentation 123 8538 Arab J Sci Eng (2014) 39:8537-8547

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Section: Two-layer Anchor-infill Assembly: Effectivenessmentioning

confidence: 97%

Section: Cyclic Rulesmentioning

confidence: 99%