Title:
Composite Action of Circular Concrete-Filled FRP Tube Columns under Lateral Cyclic Load
Author(s):
Ahmed Mohamed Ali and Radhouane Masmoudi
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/24/2019
Abstract:
Concrete-filled fiber reinforced polymer (FRP) tubes (CFFT) have a superior resistance to harsh environmental conditions. In addition, the FRP tube considers a noncorrosive reinforcement and protects the concrete core against severe environmental conditions. The composite action has a significant effect on the flexural behavior of any composite structural element. The bond between the FRP tube and the concrete core reflects the degree of composite action between them. This case study presents an experimental investigation, which uses a new technique to evaluate the bond between the FRP tube and the concrete core. This technique depends on using internal strain gauges inside the concrete core and comparing the measured strains with the corresponding strains on the external tube surface. Full composite action means that the strain distribution is linear over the cross section (plane sections remain plane) and the internal concrete strain is equal to the external strain on the tube surface at the same position. Two full scale columns with different diameters 305 mm (12 inch) and 406 mm (16 inch) were tested under lateral cyclic load. These columns are connected to rigid reinforced concrete (RC) footings. The experimental results indicate that the composite action was achieved at the beginning of the test, then the failure of the bond between the concrete core and the tube occurred. After the bond failure, the tube and the concrete core were working individually.