Abstract
The paper presents results from tests on low-slenderness reinforced
concrete (RC) walls designed to modern code provisions, initially
subjected to cyclic loading to failure, and subsequently conventionally
repaired and then strengthened using fiber-reinforced polymer (FRP)
jackets. Repair involved replacement of damaged concrete by a high-strength
mortar and lap-welding of fractured reinforcement in the plastic
hinge region, while strengthening involved wrapping of the walls
with FRP jackets, as well as the addition of FRP strips at the wall
edges, to enhance both flexural and shear capacity. In addition to
different arrangements of steel and FRP reinforcement in the walls,
a key parameter was the manner in which carbon FRP (CFRP) strips
added for flexural strengthening were anchored; combinations of glass
FRP (GFRP) anchors and anchoring strips, as well as anchoring steel
plates, were used. Test results have shown that the addition of steel
plates to the GFRP anchors and strips leads to a more effective anchorage;
strength increases of up to approximately 30% with respect to a conventionally
repaired specimen were measured when properly anchored FRP strips
were used, but energy dissipation capacity of the original walls
(designed to modern code provisions) could not be fully restored.
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