Rehabilitation and strengthening of high-strength rectangular CFST beams using a partial wrapping scheme of CFRP sheets: Experimental and numerical study

摘要: Abstract Recently, concrete-filled steel tubular (CFST) members are becoming highly recommended by engineers for use in composite structures. Lately, carbon fiber-reinforced polymer (CFRP) materials have been used strengthening and CFST flexural members. Both experimental numerical studies adopted this research to further investigate the behavior of various sections rectangular beams strengthened and/or repaired with unidirectional CFRP sheets. The effects U-shaped wrapping scheme using multiple layers applied at beam lengths was studied. In general, results demonstrated that moment capacity increased significantly increasing layers; example, it approximately 40% 55% compact slender sections, respectively, when wrapped 4 layers. damaged has improved over 65% 2 Moreover, along 75% its length achieved a similar enhancement ratio as 100% same