Ultra-high-performance Fiber Reinforced Concrete: An Innovative Solution For Strengthening Old R/C Structures And For Improving The FRP Strengthening Method
Free (open access)
273 - 284
A. G. Tsonos
In this study a new innovative method of earthquake-resistant strengthening of reinforced concrete (R/C) 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 also proposed 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 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. Keywords: steel fiber ultra high-strength concrete, reinforced concrete jackets, fiber reinforced polymers, beam-column joints, columns, cyclic loads.
steel fiber ultra high-strength concrete, reinforced concrete jackets, fiber reinforced polymers, beam-column joints, columns, cyclic loads