Influence of construction conditions on strength of post installed bonded anchors

González, Francisco; Fernández, Jorge; Agranati, G.; Villanueva, Paula

doi:10.1016/j.conbuildmat.2017.12.144

Cited by 23 publications

(11 citation statements)

References 16 publications

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“…Post-installed anchor systems are very flexible and useful in different critical situations [1,2], nevertheless in some cases their use is limited (i.e., geometrical restrictions, mechanical properties of the base material, lack of design guidelines). To increase the range of applications and to improve the safety level, several researches have been performed in the last years [2][3][4][5][6][7][8][9][10][11][12][13] exploring both the range of applicability (i.e., considering high/low strength concrete [3][4][5][6] or reduced geometry [7]), investigating the safety level of existing codes [8,9], and the reliability of the connections. This last aspect has been investigated with particular reference to adhesive anchors [10][11][12][13] since the in-situ conditions could strongly affect the anchorage performance and the safety level as well.…”

Section: Introductionmentioning

confidence: 99%

Response of Connections between Concrete Corbels and Safety Barriers

Cattaneo

Crespi

2019

Materials

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Post-installed anchor systems are widely used in several applications both for retrofit and new constructions due to their flexibility and easiness of installation. For these reasons, their use is very common to connect safety barriers to concrete corbels. However, the design requirements for fastening (Eurocode 2—Part 4, ACI 318 or for post-installed rebar (Eurocode 2-Part 1 can be hardly satisfied due to the geometric restrictions of the application. Additional complications arise for the refurbishment of bridge corbels, which usually requires the removal of the damaged top concrete layer. This paper presents a new anchoring system that consists of the use of additional post-installed U-shaped rebars connecting the lower existing portion of the corbel to the upper (rebuilt) layer, able to carry the required design loads. The proposed solution considers three anchors that transfer the external loads to the corbel, to the existing reinforcements, and to the U-shaped rebars. The system is tested experimentally and validated by using both theoretical (strut and tie modeling) and numerical analyses.

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Section: Introductionmentioning

confidence: 99%

Response of Connections between Concrete Corbels and Safety Barriers

Cattaneo

Crespi

2019

Materials

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“…considered for each concrete block were the type of drilling machine used for drilling the hole, type of filling material, moisture conditions of the hole during installation, cleanliness of the hole, and installation direction [3]. There are five main failure modes of post-installed anchors in concrete, as shown in Fig.…”

mentioning

confidence: 99%

“…There are five main failure modes of post-installed anchors in concrete, as shown in Fig. 1 steel failure (shear), pull-out failure, concrete cone failure, concrete splitting failure and space, edge cone failure [3]. There are several studies available in literature related to the behavior of the rebar anchor system.…”

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confidence: 99%

Experimental Study of Post Installed Rebar Anchor Systems for Concrete Structure

Haidar

Mussa

Dawood

et al. 2020

Civil and Environmental Engineering

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This study investigated the effectiveness of several types of adhesives used in post-installed rebar connections as a bonding agent between steel reinforcement bars and old concrete under pull out test. The experimental samples were; cylindrical samples of (150 mm dia. × 300 mm high) with anchors rebar of varying diameter (12 and 16 mm), different embedded length (100 and 150) mm with different holes’ diameters. The strategy of control were cast-in-place rebar concrete specimens while other samples are post-installed rebar concrete specimens of varied chemical adhesives as bonding agents, namely KUT EPOXY ANCHOR ‘NS’ and SIKAFLOOR169. The output showed that the different adhesives yielded closed pull-out load values. It is found that the pull-out capacity (bond strength) is increased by increasing the embedded length, the diameter of the rebar and slightly with the diameter of the hole. In addition, the failure mode of post-installed rebar concrete was governed by the embedded length and the area of contact with the adhesives. On the other hand, the larger diameter of rebar favors splitting or failure of concrete due to higher strength in binder-rebar interface compare to the binder-concrete interface. The results showed that the pull-out load was increased by (26 % and 32 %) as the rebar diameter increased from 12 mm to 16 mm for KUT “NS” and SIKAFLOOR respectively. The hole diameter had slightly effect of the pull out load where the average of increment was only 6 %. Finally, the bonding strength is considerably depended on the embedded length and less affected by the type of epoxy.

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“…The authors found that the capacity of the anchor is influenced significantly by the installation condition and the drilling machine. Also, the authors found that the hole condition has an influence on the anchor capacity (González et al, 2018).…”

Section: Adhesive Anchors Under Tensile Loadmentioning

confidence: 97%

“…They related the increase in the displacement to hole clearance, therefore, they suggested that a proper filler has to be used to fill the gap (Mahrenholtz and Eligehausen, 2015). González et al (2018) studied the tensile behaviour of post-installed (adhesive and grouted) anchors at different construction conditions. The authors used conventional (vibrated concrete) and self-compacting concrete.…”

Section: Adhesive Anchors Under Tensile Loadmentioning

confidence: 99%

Finite Element Modelling of Anchorage to Concrete Systems at Different Strain Rates

Saeab¹,

Ahmed²

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Demand for flexibility in design and faster construction times has resulted in the increasing use of fasteners in a variety of concrete structures. These structures are exposed to static and dynamic loading conditions. Furthermore, these structures can be exposed to high strain rate loading such as encountered in impact and blast loads. Thus, anchorage systems used to fasten elements to concrete structures are also exposed to the high strain rates of loading which can be tensile and shear loads. If not adequately designed and constructed, anchorages can fail in a catastrophic manner and pose significant threat to building safety and the life of building occupants.Behaviour of anchors embedded into concrete and subjected to static load has been widely investigated experimentally. However, despite the fact that many structures that contain anchorage systems are exposed to dynamic loads, the research in this vital area is limited.

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Influence of construction conditions on strength of post installed bonded anchors

Cited by 23 publications

References 16 publications

Response of Connections between Concrete Corbels and Safety Barriers

Response of Connections between Concrete Corbels and Safety Barriers

Experimental Study of Post Installed Rebar Anchor Systems for Concrete Structure

Finite Element Modelling of Anchorage to Concrete Systems at Different Strain Rates

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