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It shows that the axial compressive capacity increased with the number of FRP layers and the axial strength of CCFSTs is higher than that of BCFSTs.
In total, 11 specimens were prepared, including 3 CFSTs, 4 CCFSTs, and 4 BCFSTs.
The average axial compressive capacity of CFSTs, CCFSTs, and BCFSTs was 1207 kN, 1949 kN and 1421 kN, respectively.
The deviations of experimental and analytical results of CCFSTs and BCFSTs are 4.53% and -12.21%, respectively, which is considered acceptable.