Abstract
This paper reports on an experimental investigation into the axial and lateral strain development of fiber reinforced polymer (FRP) confined high-strength concrete (HSC) with prestressed FRP shells. A total of 24 aramid FRP (AFRP)-confined concrete specimens were manufactured as concrete-filled FRP tubes (CFFTs) with instrumentation to measure the strain variations during application of prestress, removal of end constraints and progressive prestress losses. Prestressed CFFT specimens were prepared with three different dose rates of expansive mineral admixture to create a range of lateral prestress applied to AFRP tubes manufactured with sheet thicknesses of 0.2 or 0.3 mm/ply and referred to as lightly- or well-confined, respectively. In addition to these three levels of prestress, non-prestressed companion specimens were manufactured and tested to determine baseline performance. The experimental results from this study indicate that lateral prestressing of CFFTs manufactured with HSC can be achieved by varying the expansive mineral admixture dose rate with a lateral prestress of up to 7.3 MPa recorded in this study. Significant strain variations were measured during removal of the end constraints with up to 700 microstrain recorded in the axial direction. Finally, the measurement of prestress losses for the month following prestress application revealed minimal progressive losses, with only 250 and 100 με recorded for the axial and hoop strains, respectively.
Highlights
The use of fiber reinforced polymer (FRP) composites as a wrap or jacket for the confinement of concrete columns has gained significant research attention over the last two decades
This paper reports on an experimental investigation into the axial and lateral strain development of fiber reinforced polymer (FRP) confined high-strength concrete (HSC) with prestressed FRP shells
The experimental results from this study indicate that lateral prestressing of concrete-filled FRP tubes (CFFTs) manufactured with HSC can be achieved by varying the expansive mineral admixture dose rate with a lateral prestress of up to 7.3 MPa recorded in this study
Summary
The use of fiber reinforced polymer (FRP) composites as a wrap or jacket for the confinement of concrete columns has gained significant research attention over the last two decades. The addition of prestrain to the FRP fibers is a potential technique to overcome the uncontrolled expansion, limited studies exist on the application of prestress to FRP confined concrete. To address this research gap, this paper reports on an experimental program to monitor prestress development for FRP-confined HSC specimens manufactured with four different dose rates of expansive mineral admixture. Variations in axial and lateral strains in the FRP shell are reported for the 3 key prestress stages: application of prestress; removal of end constraints; and progressive prestress losses. Discussions on the effects of the key parameters are provided
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