Bonded Anchors In High Performance Concrete
Author(s)
J. Barnat & M. Bajer
Abstract
The design of chemical anchor elements presents an ever-topical challenge.
Bonded anchors have been in use for many years, but their main field of
application is still in concrete with common strength characteristics. This paper
summarises the results of experimental and numerical research focused on
determination of the behaviour and bond strength limits of what are currently the
most widespread industrial glues used for anchor bonding. The goal of this
research is to find the limits of the effective use of such glue types in high
performance concrete, and also to verify the most commonly used design
methods for bonded anchors. The progress and configuration of the experiments
are described.
Keywords: bonded anchor, load bearing capacity, bond strength, experiment,
tensile load, high performance concrete.
1 Introduction
The presented research is focused on issues of bond quality and the combined
concrete-bond failure of bonded anchors loaded by tensile force. It details an
experimental analysis of the glue-concrete interface and the effect of its
parameters on anchor behaviour. Usually, in most design approaches the ultimate
tensile load-bearing capacity is based on the simplified assumption of separated
failure modes. The final design value is covered by a relatively high safety
factor. This assumption is also used in certification regulations for post-installed
anchors in concrete e.g. the relevant ETAG [1]. The result of the real failure of
an anchor loaded by tensile force is shown in Fig. 1 (the failure of the steel
anchor bolt is not shown). It is obvious that this failure is influenced by the
characteristics of both the concrete and the glue. It is evident from the picture
that fully separated failure modes occur only theoretically. A real-life failure will
Keywords
bonded anchor, load bearing capacity, bond strength, experiment,
tensile load, high performance concrete.
Related Book
Other papers in this volume
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