Article | REF: C2264 V1

Reinforcement of Concrete Structures. Concrete Overlay Design

Author: Gaël LE BLOA

Publication date: February 10, 2023

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ABSTRACT

The European standard for the design of reinforced or prestressed concrete structures, the so-called Eurocode 2, contains rules for the design of concrete joints. However, for the design of reinforced interfaces with shear connectors, EOTA TR 066 is the appropriate design approach.

This article presents a comprehensive analysis about the topic of concrete overlays. It examines the current dimensioning regulation and deals with the individual load bearing components that describe the resistance at the interface of concrete overlay. Information is given about the preparation of the interface surface and installation of the post-installed connectors on the basis of EOTA TR 066. Finally, tools are provided showing how such structural connections may be modelized and designed as a whole.

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AUTHOR

  • Gaël LE BLOA: Head of Approvals, Certifications and Regulations - Hilti Western Europe

 INTRODUCTION

The use of reinforcement and repair techniques for reinforced and prestressed concrete structures is becoming increasingly common. In fact, all over the world, there are buildings used for residential purposes, industrial activities, logistics, transport, engineering structures, etc. that need to be reinforced or rehabilitated for a wide variety of reasons. On the one hand, their supporting structures, which vary greatly in quality, capacity and function, all age and deteriorate over time. Some 85% to 90% of the world's structures have already reached a service life in excess of 20 years, and a large number of them should or will have to be replaced or repaired due to their state of damage. On the other hand, mistakes may have been made during the design or construction phase, so some structures need to be reinforced or upgraded before they can be used. Lastly, changes in the use of a building or structure may require transformations (e.g. significant increases in demand in the transport sector) if new requirements or changes in standards mean that the corresponding structures need to be reinforced.

When one of these situations arises, the engineer must assess whether it is more economical to reinforce the structure already built, rather than replace it. In the first case, a number of techniques are available that are well suited to existing concrete structures or buildings. For example:

  • shotcrete ;

  • different types of coatings such as :

    • carbon fibers or laminates,

    • a new layer of concrete ;

  • prestressing cables laid outside the structure, i.e. additional post-tensioning.

Among these methods, techniques for reinforcing concrete structures by embedding or adding a new layer of concrete are an interesting alternative. In fact, this method of reinforcing structures with concrete sections offers a number of advantages:

  • increase the strength of deteriorated or damaged structures, or those subject to design or execution faults, in order to extend their service life;

  • adapt the structure to changes in operating conditions (change of use) or increase its load-bearing capacity.

It should be noted, however, that the methodology used for implementation can vary significantly: presence or absence of connectors or seam steels, quality of the rework surface, etc.

This article begins with a general introduction to the principle of repairing and reinforcing concrete structures by embedding or pouring a new layer of concrete. It also details...

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KEYWORDS

Concrete   |   structure   |   modelling   |   strengthening   |   Concrete strength   |   standard   |   structural strength   |   compensation   |   connectors


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Reinforcement of Concrete Structures