Abstract
An experimental and numerical study was completed in order to examine the mechanical behaviour of post-installed bonded anchors in ultra-high performance fibre reinforced concrete with a compressive strength higher than 130 MPa. The aim was to analyse the failure mechanisms in static pullout tests and to suggest a simple numerical model, which can be employed in a design stage, to reproduce the global behaviour of the anchor. The experimental observations show that a combined pullout and concrete cone failure occurred for an embedment depth of 40 mm and a steel rod failure for an embedment depth of 100 mm. The numerical model was set up using Abaqus software, by adopting the concrete damage plastic model and a surface-based cohesive behaviour for the interface concrete-anchor. The obtained failure modes and ultimate loads are in good agreement with experimental results. A minimum embedment depth of 50 mm was assessed to prevent a pullout failure of the anchor.
Highlights
In civil engineering or in industrial building, fastening of structural or non-structural members in reinforced concrete is often performed by means of anchors
For an embedment depth of 40 mm (h40) with a pullout failure, the FE model accurately reproduced the global behaviour of the anchor
The use of ultra-high performance fibre reinforced concrete enables to significantly improve the tensile capacity of the post-installed bonded anchors
Summary
In civil engineering or in industrial building, fastening of structural or non-structural members in reinforced concrete is often performed by means of anchors. Post-installed anchors are currently used in repair and retrofit applications and in new construction with the development of precast concrete products. These anchors can be classified into three categories: expansion anchors, undercut anchors, and bonded anchors. The incorporation of steel fibres into the concrete improves the concrete performances in terms of ductility and tensile strength It should have an impact on the mechanical behaviour of post-installed anchors. An experimental campaign was led in order to provide additional experimental data on the tensile behaviour of bonded anchors in UHPFRC of compressive strength higher than 130 MPa. The tested parameters are the embedment depth, the edge distance and the state of cracking of the concrete sample [2]. Only the tests results in the uncracked concrete without edge effect are presented and modelled
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