Compressive Behavior of FRP-Confined Concrete-Filled PVC Tubular Columns


This paper presents a new composite confinement system of FRP wrap and PVC tube with and without an impact absorption medium (compressible foam) in between. The compressive behavior of the proposed FRP-confined concrete filled PVC tube (CCFPT) was investigated and compared with those of the concrete filled PVC tube (CFPT) and FRP-wrapped (FW) concrete cylinder. The effect of compressible foam on the post-peak behavior of the CCFPT specimen was explored. The applicability of seven existing FRP-confined stress-strain relationships to predict the ultimate strength and ductility enhancement of FW and CCFPT specimens was evaluated. A total of 14 FW, 5 CFPT, and 17 CCFPT specimens with 152 mm in diameter and 305 mm in height were tested under monotonically increasing axial loads in compression. The key parameters examined included the type and thickness of FRP wraps, the presence and thickness of compressible foam, and loading area. Test results indicated that, without compressible foam, the CCFPT cylinders resembled the FW cylinders in stress-strain relationships with brittle failures upon FRP rupture and immediately-followed PVC fracture due to sudden transfer in confining pressure. With compressible foam, the CCFPT cylinders can combine the strength of the FW cylinders and the ductility of the CFPT cylinders.


Civil, Architectural and Environmental Engineering

Keywords and Phrases

Confinement; FRP-Confined Concrete-Filled PVC Tube; Mechanical Testing; Strength; Brittle Fracture; Concrete Testing; Cylinders (Shapes); Ductility; Foams; Plasma Confinement; Compressive Behavior; Concrete Cylinders; Confining Pressures; Post-Peak Behaviors; Stress-Strain Relationships; Ultimate Strength; Stress-Strain Curves

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Article - Journal

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© 2016 Elsevier Ltd, All rights reserved.

Publication Date

01 May 2016