Strengthening of Concrete Structures with Adhesively Bonded Reinforcement

Strengthening of Concrete Structures with Adhesively Bonded Reinforcement

The strengthening of concrete members means using constructional measures to restore
or improve their load-carrying capacity, serviceability, durability or fatigue strength.
The effects of strengthening measures can generally be described in quantitative terms
and therefore analysed numerically. Besides numerous other methods (see [3, 4], for
example), the subsequent strengthening of existing concrete members can be achieved
by using adhesives to bond additional reinforcing elements onto or into those members.
This topic of reinforcement bonded with adhesive has been the subject of many
contributions to various editions of the Beton-Kalenderin the past (see [5, 6]). However,
design approaches for adhesively bonded reinforcement have continued to evolve
(see [7, 8]) and the new DAfStb guideline [1, 2] on this subject revises those design
methods and adapts them to our current state of knowledge.

In the past, the product systems as well as the design and installation of adhesively
bonded reinforcement were regulated in Germany by national technical approvals and
individual approvals. Such approvals contained provisions covering the materials, the
design of the strengthening measures, the work on site and the monitoring of products.
There were several reasons why it was deemed necessary to revise the design
approaches of the earlier approvals.
One of those reasons was the harmonization of standards across Europe, leading to
national standards and regulations being successively adapted to the European standards.
These developments also render it necessary to adapt the former national approvals to the
new generation of standards.


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