The behavior of post-installed large-diameter anchors

In this study, pull-out tests were performedon large-diameter anchors (diameter (U) = 36 mm, 48 mm, 90 mm,or 150 mm) for different embedment depths (8d and 12d) using different anchoring agents (organic and inorganic agents) and steelbars with different types of surfaces (plain and grooved), in order to investigate the behavior of adhesive anchors embedded in concrete under tensile loads.

04/gen/2016 10.24.17 hollowbar Contatta l'autore

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In most cases, these modes are related to specific products, and the diameter of the test bars usedis usually less than 40 mm.Unfortunately, anchor bars with diameters of less than 40 mm do not satisfy the requirements for industrial buildings, especiallyin the metallurgical industry, and very limited information is available on the behavior of post-installed large-diameter anchors in concrete foundations. 

In this study, pull-out tests were performedon large-diameter anchors (diameter (U) = 36 mm, 48 mm, 90 mm,or 150 mm) for different embedment depths (8d and 12d) using different anchoring agents (organic and inorganic agents) and steelbars with different types of surfaces (plain and grooved), in order to investigate the behavior of adhesive anchors embedded in concrete under tensile loads. 

The aim was to establish the relationship between the pull-out force and the characteristics of the post-installed large-diameter anchors, as well as establish design guidelines for retrofitting of old equipment in large steel plants.

Post-installed anchors are embedded in holes that are drilled into existing concrete foundations. Thus, any load applied to the supported structure is passed by the anchoring system to the primary system through the frictional forces that develop between the sides of the holes and the anchor wedges and sleeves or any other mechanical locking devices attached. 

The mechanism of loadtransfer depends on the type of anchor system installed.Traditionally, on the basis of the load-transfer mechanism involved, post-installed anchors are classified into two categories:

(1) Mechanical anchors: these anchors transfer load through friction and mechanical interlocking.

(2) Adhesive anchors: these anchors rely on adhesion between the anchor and the adhesive or that between the adhesive and the concrete to transfer loads.

More information here

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