Abstract
This paper presents results of an experimental study on seismic response of reinforced concrete (RC) T-beams with shear deficiencies strengthened with externally bonded steel fiber reinforced polymer (SFRP) strips. Seven cantilever RC beams were strengthened with externally bonded uniaxial SFRP strips in a U-shape configuration and were tested under cyclic loading conditions. The two main variables examined were the strip spacing and the use of anchoring system. Among the investigated anchoring systems, one was patented, and it is studied in the present manuscript. The examination of the results leads to the conclusion that the anchoring system has a significantly more pronounced effect on the performance of the beams and the mode of failure than the type or spacing of the strips. Furthermore, SFRP strips seem to have a great potential to be used for shear strengthening, especially since the use of mechanical anchoring systems drastically improves their performance. On the contrary, the lack of mechanical anchoring results in premature delamination of the strengthening system, and thus an undesirable SFRP material performance.
Highlights
The use of externally bonded fiber reinforced polymers (FRP) for strengthening of reinforced concrete structures has shown great potential as it provides a relatively inexpensive way to improve the strength and prolong the life of structures. [1,2,3,4] FRP overlays have been investigated and used for flexural and shear strengthening of reinforced concrete (RC) members
Shear strengthening systems could either consist of continuous fabrics covering the whole length of the specimen or uniaxial strips placed at some intervals
An analysis of the presented experimental data leads to the following conclusions: A strengthening system that combines high-strength steel fibers together with organic epoxy is experimentally investigated under cyclic loading conditions
Summary
The use of externally bonded fiber reinforced polymers (FRP) for strengthening of reinforced concrete structures has shown great potential as it provides a relatively inexpensive way to improve the strength and prolong the life of structures. [1,2,3,4] FRP overlays have been investigated and used for flexural and shear strengthening of reinforced concrete (RC) members. [1,2,3,4] FRP overlays have been investigated and used for flexural and shear strengthening of reinforced concrete (RC) members. Carbon FRP is the common choice in external shear FRP strengthening of RC. This is especially true for the best performing strengthening schemes that include anchoring mechanisms or full wrap of the RC member. Shear strengthening systems could either consist of continuous fabrics covering the whole length of the specimen or uniaxial strips placed at some intervals.
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