04/06/2019

Research On Strengthening Of Weak Structures

The safety of structures is of high importance affecting people’s lives. Structural evaluation, and possibly intervention is considered necessary for old structures, structures that have been affected by accidental actions and also for structures in high seismic risk areas.

Existing techniques for the strengthening of Reinforced Concrete (RC) structures present crucial disadvantages which are related to the poor performance, the high cost and the ease of application of the techniques. Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) is a material with unique properties.

These unique properties make the material appropriate for applications where thin elements with high strength and durability are required.

A promising application of UHPFRC is for strengthening purposes. UHPFRC can be cast as thin layers using different configurations to increase the load-carrying capacity of the weak members. Therefore, it can be cast as thin UHPFRC layers (with and without the use of steel bars) or as a jacket (Figure 1,2,3).

The addition of UHPFRC layers results in a large increase in the stiffness of weak Reinforced Concrete (RC) beams, while the formation of the cracks is delayed and the load-carrying capacity is also increased.

The addition of steel bars in the UHPFRC layers, on the other hand, can produce a large increase in the load-carrying capacity of the weak elements. The optimum performance is achieved with the construction of jackets (Figure 4).

 

Dr Spyridon Paschalis

Lecturer in Civil Engineering

Civil Engineering

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