Abstract
Vertical elements fail during earthquakes due to lateral load. Carbon-fiber-reinforced polymer (CFRP) can play a significant role in preventing sudden collapse due to lateral load. Confinement provided by transverse shear reinforcement and polymer sheets increases both the compressive and lateral strength of concrete. To test the effect of CFRP confinement on concrete columns, seven square and four circular vertical specimens were tested and results were compared with theoretical predictions at Bangladesh University of Engineering and Technology. The specimens were wrapped at the vertical portion on an intermittent basis so that CFRP strips fell at the gap of horizontal reinforcements of the specimens’ vertical portion. Cyclic shear test was performed while maintaining axial compression. The test results were close to the theoretical predictions. The results thus suggest that CFRP wraps can contribute increased shear strength and ductility of vertical elements. High-strength concrete specimens did not reach their maximum strength due to the testing facility’s limitations, but they provided the expected results in the lower bound.
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