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Strengthening of concrete structures with fibre reinforced polymer plates (FRP)

Strengthening of concrete structures with fibre reinforced polymer plates (FRP)

Type of project:

Responsible part:
DTU, Dept. of Civil Engineering

In recent years strengthening of existing concrete structures by means of FRP-technique has become a very important field of research in civil engineering. Today, much focus is brought on to understanding of the behaviour of FRP strengthened concrete structures and a lot of work has been done. The development in modern societies has introduced new demands for concrete structures. For instance new requirements from the transportation sector and rearranging of the purpose of a structure are just some of the demands to be highlighted in the field of strengthening of concrete structures.

One of the purposes of the project is to investigate the behaviour of the FRP strengthened concrete structures within the domain of bonding of the FRP sheets and plates. This subject is of great interest to researchers around the world and is greatly covered. There is, however, need for simple design methods anchored in the Danish tradition of the theory of plasticity for reinforced concrete.

The theory of plasticity is intensively taught in Denmark and it gives great opportunity to make simple estimates in preliminary design of concrete structures. The extreme importance of focusing on producing simple design formulas for direct use in consulting engineering is thus obvious. Therefore the bonding issue of FRP sheets will be treated by means of the plastic theory for joints.

Another objective of the project is the issues of beams in bending and shear retrofitted with FRP sheets. In bending, the simple plastic theory for beams is used. In shear the sliding crack theory.

Furthermore, in the issue of the theory for joints, the means of fracture mechanics are necessary to reach better understanding of the bonding of FRP sheets. It is also very likely that the above described approaches will give rise to the necessity of experimental investigations. They will be conducted at the laboratory of the Department of Civil Engineering.

Project period:
January 2007 – December 2008

DTU, Dept. of Civil Engineering
Alectia A/S


Relation to the Danish Concrete Counsel focus areas:
1. Efficiency and economics  (x)
2. Aesthetics, function, and flexibility
3. Environment, work environment, and indoor climate
4. Recruitment, education, and R&D