2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Mr. Radhouane Masmoudi, Université de Sherbrooke
The interfacial bond in concrete-filled fiber-reinforced polymer (FRP) tubes (CFFT) should be sufficient to provide full composite action between the FRP tube and its concrete core. Although, CFFT members had been investigated widely in the last two decades, there is no standards or guidelines to determine the interfacial bond strength on CFFT members. This study presents an experimental investigation of the interfacial bond strength between the concrete core and the fiber-reinforced polymer (FRP) tubes of circular pultruded concrete-filled FRP tubes (CFFTs). This research also provides a test method to determine the interfacial bond strength of the CFFT members. Six full-scale circular CFFT specimens were tested with two different tube sizes, 305 mm diameter and 406 mm diameter, 200 mm height, and all tubes have 12.7 mm tube wall thickness. All specimens were filled by the same concrete. The specimens were tested under a test setup prepared especially for these specimens. The specimens were loaded vertically, and the vertical load was applied on the concrete core while the specimen was supported vertically on the FRP tube only. The vertical loads and the slippage between the FRP tube and its concrete core were recorded to plot the interfacial bond-slip relationships for each specimen.