Abstract:
The sudden punching shear failure of flat slabs is a critical issue. The combined effects of externally strengthened
Carbon Fiber Reinforced Polymer (CFRP) flexural reinforcements and post-installed CFRP shear reinforcements
which explain the real behavior in the strengthening phase of a shear deficient slab, on the punching shear
performance are not fully explained. In this study, the flat slab panels of 1200 mm × 1200 mm × 100 mm were
retrofitted with seven alternative bonding arrangements of CFRP to investigate the combined effects of shear
dowels and flexural reinforcements. A transient load was applied using a stub column, size 100 mm × 100 mm
located at the center of the slab. The non-strengthened specimens failed in punching shear. The strengthened
specimens showed a maximum punching shear capacity enhancement of 120%. A numerical model was also
developed to identify the load transfer behavior of post-installed CFRP shear dowels. Further, the effects from
the end anchorage of external CFRP and the refilling material at drilled locations to install CFRP shear
strengthening scheme were also determined.
Citation:
Silva, M. A. L., & Gamage, J. C. P. H. (2020). Combined effects of Carbon Fiber Reinforced Polymer flexural reinforcements and post installed shear dowels on the performance of flat slabs. Composite Structures, 236, 111848. https://doi.org/10.1016/j.compstruct.2019.111848
