Abstract
To investigate the reinforcement effect of external CFRP strengthening on pultruded concrete-filled GFRP tubular (CFGT) short columns under axial compression, a total of 60 specimens were axially tested, including 48 specimens strengthened with different layers of CFRP and 12 specimens without CFRP strengthening. The main parameters considered in this study consist of the height of the column, concrete strength, and strengthening layers of CFRP. The failure modes, ultimate strength, load–displacement curves, load–strain curves, initial stiffness, and ductility of all specimens were obtained and discussed. Test results indicate that the specimens unstrengthened with CFRP are failed with the brittle failure under axial compression. The failure modes of specimens gradually change from the brittle failure to ductile failure with the increase of strengthening layers of CFRP. Compared with the unstrengthened CFGT short columns, the ultimate strength, deformability, and ductility of columns strengthened with CFRP are significantly enhanced. The more strengthening layers of the CFRP has, the larger the ultimate strength of specimens is. However, the strengthening layers of CFRP have little effects on the initial stiffness of CFGT short columns. Among the above three parameters, the strengthening layers of CFRP exert the most significant and positive influence on the ultimate strength of specimens, while the influence of the column height is completely adverse. Based on the experimental achievements, a formula for the calculation of ultimate strength of pultruded CFGT short columns externally strengthened with CFRP is proposed, which shows great accuracy and rationality in comparison with the experimental results.
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