An experimental study was conducted to investigate the behavior of composite\nconcrete beams damaged and cracked under pure torsion, and then repaired\nby external strengthening. This was achieved using high strength Carbon\nFiber Reinforced Polymer (CFRP) laminates bonded with epoxy four\ncomposite modify reactive powder concrete (MRPC) I-beams. Different types\nof section (Solid & with opening) were tested to obtain the effect of amount of\nCFRP laminate on beams ultimate torque behavior, angle of twist and failure\nmodes. The results obtained showed that a significant effect of external high\nstrength CFRP laminates on effectively restore of section solid, the range of\n89.8% to 91.2% of ultimate torsional strength effectively restored as well as effectively\nrestoring of section opening by 83.48% - 86.67% of ultimate torsional\nstrength. The repaired beams give high efficiency in ultimate torsional\nstrength, and indicate that the adopted technique gives a good torsional\nstrength.
Loading....