LOCALIZED TORSIONAL STRENGTHENING TECHNIQUE FOR RC BOX BEAMS WITH TRANSVERSE OPENINGS
, Volume , Issue Conference proceedings 2020, Pages 341-358
Abstract
In the present study, experimental analysis was performed to investigate the effect of localized strengthening by steel plates on the torsional capacity of reinforced self-compacting concrete (SCC) box beams containing a transverse opening under pure torsional moments of seven hollow core beam specimens. The seven tested beam specimens were cast with the dimensions (1800x300x300mm) respectively, for the length, width, and depth; six of them including transverse openings of dimensions (100x100mm). The parameter studies were: with or without transverse opening, the position of the transverse opening was at (L/4) and (L/2) of the clear span length of the beams (from one side or two sides). The current strengthening technique used depends on: the localized steel plates fabricated to be fully bonded with SCC through using bolts as shear connectors. The experimental results show the ultimate torque decreased by (34.7%) and (45.3%) for the tested specimens which contained transverse openings respectively at a distance (L/4) and (L/2), in comparison to the control beam. By the opposite side, the ultimate torsion moments were increased by (34%) and (55.5%) for the tested specimens which contained transverse opening at a distance (L/4) and respectively strengthened by (one and two) face localized steel plates, relative to the reference specimens. Whereas, the maximum torsional moments were raised by about (20%) and (24%) for the tested specimens containing transverse opening at a distance (L/2) and strengthened by (one and two) face localized steel plates respectively, compared to the reference beam. , it concluded that torsional capacity has deteriorated because of the existing transverse opening, and it has been enhanced due to the contribution of the approved technique.
Metrics