The Influences of Mechanical Load on Concrete-Filled FRP Tube Cylinders Subjected to Environmental Corrosion
Fiber-reinforced polymer (FRP) has been introduced into civil engineering since last century and finds tremendous applications in retrofitting and constructing infrastructures. Numerous studies have been done on its durability performance; however, most of the test specimens were not applied with mechanical loads while subjecting to environmental conditions, which didn’t reflect the actual service load in a real application. This paper aims to investigate the influence of mechanical loads on concrete-filled FRP tube (CFFT) cylinders while they are under harsh environmental conditions. Both loaded and unloaded specimens were put into an environmental chamber and exposed to freeze/thaw cycles, wet/dry cycles, and heating/cooling cycles for 72 days. Compression tests and split-disk tensile tests were conducted on the CFFT cylinders and the outer FRP tubes, respectively, after the conditioning was completed. Experimental results showed slight reduction on the stress, but considerable decrease on the strain for loaded CFFT when comparing to unloaded specimens.
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