Browsing by Author "Silva, MAL"

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item: Article-Full-text
Combined effects of Carbon Fiber Reinforced Polymer flexural reinforcements and post installed shear dowels on the performance of flat slabs
(Elsevier, 2020) Silva, MAL; Gamage, JCPH
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.
item: Article-Full-text
Performance of severely damaged reinforced concrete flat slab-column connections strengthened with carbon fiber reinforced polymer
(Elsevier, 2021) Silva, MAL; Dedigamuwa, KV; Gamage, JCPH
The punching shear failure of a slab‐column connection is a sudden catastrophic failure. The majority of studies have been focused on the strengthening aspects of non‐cracked slab‐column connections. However, the attention given to the retrofitting of heavily damaged slab‐column connections is comparatively less. Therefore, it is crucial to investigate the suitable damage repairing methods as well as post‐strengthening methods to enhance performance of damaged slab‐column connections. In this study, a total of twenty‐six heavily damaged medium‐scale flat slab‐column connections were repaired using an in‐situ chip concrete mixture. Then the damage repaired specimens were retrofitted using alternative arrangements of Carbon Fiber Reinforced Polymer (CFRP) in such a way to investigate the effects of sensitivity of bond parameters on punching shear performance. The punching shear capacity enhancements observed from retrofitted connections were in the range between 20% and 90%.
item: Article-Full-text
Performance of slab-column connections of flat slabs strengthened with carbon fiber reinforced polymers
(Elsevier, 2019) Silva, MAL; Gamage, JCPH; Fawzia, S
Retrofitting of slab-column connections has become a crucial concern as they are highly vulnerable to fail in punching shear failure. External strengthening is practically feasible rather than the post-installation of shear reinforcement in deteriorated slab-column connections. Hence, the behavior of medium scale slab-column junctions strengthened with alternative arrangements of Carbon Fiber Reinforced Polymer (CFRP) was studied. Numerical models were also developed to analyze bond behavior. The model predicted performances are in good agreement with the test results. The maximum average punching shear enhancement of 46% was observed from the specimens with CFRP plates attached to the tension face of the specimens with steel end anchors.