Effects of steel fibres on hammer drilling in concrete for the installation of post-installed anchors

Spyridis, Panagiotis; Walter, Lars; Biermann, Dirk; Dreier, Julia

doi:10.1016/j.jobe.2022.104395

Cited by 3 publications

(1 citation statement)

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“…The performance of anchor systems is essential to ensure the stability and integrity of the structure, and the failure of anchor systems can result in catastrophic consequences. The performance improvement of anchors in SFRC with randomly and uniformly distributed fibres has been shown in previous studies, where increase resistance of up to 70-80% has been shown in case of concrete cone breakout failure [1][10], and installation and bond quality have been also evaluated [11][12][13]. The fibre orientation can also play a critical role in the distribution of stresses around the anchor, leading to variations in the anchor pull-out strength.…”

Section: Introductionmentioning

confidence: 77%

Performance Prediction of Anchors in SFRC using Minimally Invasive and Non‐Destructive Techniques

Mellios,

Kruschwitz,

Spyrdis

2023

ce papers

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Fastenings are crucial for the upgrade of existing structures, by either enhancing structural components or modernising and expanding structures and structural systems. Whilst concrete is prevailing in the existing building stock, new types of concrete composites are increasingly used to improve the sustainability and overall structural performance of built assets. The addition of short dispersed fibres is a material technology with several applications. This paper addresses the synergy of fastening elements, introducing localised loads in concrete substrates, and of fibres, particularly in terms of the fibre orientation and density in the load application area, which is a significant quality aspect. The possibility to forecast this synergy based on non‐destructive or minimally invasive testing methods is an efficient tool to increase confidence in the design load‐bearing performance of the anchorages. Initially, previous literature and own investigations on such techniques are presented. Furthermore, a methodology is presented on associating such information to predict a single anchor's resistance on the basis of sophisticated non‐linear analyses and testing with engineered fibres alignments.

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