Abstract:

This study investigates the axial compression performance of glass⁃fiber⁃reinforced polymer （GFRP）⁃reinforced concrete （CFFT） columns subjected to chloride freeze⁃thaw cycles， with a focus on the effects of initial cutting damage. A total of 24 CFFT columns were tested in a 3.5 wt% sodium chloride solution， half of which were precut to simulate initial damage. Results indicated that damaged CFFT columns entered the symptom period earlier than undamaged columns. Both types of columns exhibited bilinear load⁃strain curves under axial compression. However， as freeze⁃thaw cycles increased， the ultimate strain decreased， and ductility deteriorated. Compared to undamaged columns， the damaged ones demonstrated reduced initial stiffness， lower ductility， and an approximate 200 kN decrease in ultimate bearing capacity under the same freeze⁃thaw conditions. These findings highlight the significant impact of initial damage on the durability and mechanical performance of CFFT columns in corrosive freeze⁃thaw environments.

Key words: concrete?filled glass?fiber?reinforced polymer tube column, freeze?thaw cycle, chlorine salt environment, cutting damage, axial compression performance