Techno Press
Techno Press

Structural Monitoring and Maintenance   Volume 1, Number 3, September 2014, pages 323-338
An innovative solution for strengthening of old R/C structures and for improving the FRP strengthening method
Alexander G. Tsonos

Abstract     [Full Text]
    In this study a new innovative method of earthquake-resistant strengthening of reinforced concrete structures is presented for the first time. Strengthening according to this new method consists of the construction of steel fiber ultra-high-strength concrete jackets without conventional reinforcement which is usually applied in the construction of conventional reinforced concrete jackets. An innovative solution is proposed also for the first time that ensures a satisfactory seismic performance of existing reinforced concrete structures, strengthened by using composite materials. The weak point of the use of such materials in repairing and strengthening of old R/C structures is the area of beam-column joints. According to the proposed solution, the joints can be strengthened with a steel fiber ultra-high-strength concrete jacket, while strengthening of columns can be achieved by using CFRPs. The experimental results showed that the performance of the subassemblage strengthened with the proposed mixed solution was much better than that of the subassemblage retrofitted completely with CFRPs.
Key Words
    steel fiber ultra high-strength concrete; reinforced concrete jackets; fiber reinforced polymers;beam-column joints; columns; cyclic loads
Alexander G. Tsonos: Department of Civil Engineering, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece

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