Effect of Varying Overlap Lengths of SFRP and CFRP Sheets on Confined Concrete Cylinders

摘要

This paper presents the results of an experimental investigation that evaluates the effect of varying the overlap lengths on the performance of SFRP (Steel Fibre Reinforced Polymer) and CFRP (Carbon Fibre Reinforced Polymer) confined small-scale plain concrete circular columns. A total of twenty-seven small-scale circular columns (150 mm diameter × 300 mm height) with a specified concrete compressive strength of 40 MPa were tested, of them, three specimens were tested without wrapping for comparison purpose. The remaining twenty-four specimens were wrapped with one layer of FRP sheet (CFRP or SFRP) with different overlap lengths (25, 50, 75, and 100 mm). All the specimens were tested under monotonic concentric uni-axial compressive load in order to evaluate the changes in properties, such as, ultimate strength, ultimate strain, stress-strain behavior, ductility, and failure mechanisms with changing the overlap lengths. Test results showed that increasing the overlap lengths improves the properties of FRP confined columns. A minimum overlap length of 50 mm and 100 mm are recommended for the CFRP and SFRP sheets, respectively.