Slab strengthening
Carbon fiber reinforced polymer(CFRP) sheet reinforcement
Carbon fiber reinforced polymer(CFRP) sheet reinforcement for floor slab
According to the design requirements, in the three-storey underground roof of the 4# garage, the 4-17 axis/4-G axis to the south of the 4-H axis post-pouring belt, the additional cover steel bar was originally designed as HRB400 25@200, and the site construction was HRB400 14@200. Therefore, it is necessary to adopt certain reinforcement measures to strengthen the floor structure. Consider sticking carbon fiber reinforced polymer(CFRP) sheet to reinforce.
Carbon fiber reinforced polymer(CFRP) sheet reinforcement for floor slab
According to the maximum transverse reinforcement area
As =25@200-14@200
=490.9-153.9
=337mm2
According to steel bar and carbon fiber technical index, the design strength of reinforcement is: fy=360N/mm2
Carbon fiber design strength: Ff=3400N/mm2
Af×Ff =Asfy
Af = fy×As / Ff
= 360×337/3400
= 35.69mm2
B=35.69/0.167=213.72mm2 <300mm2
After 15% fold shear, the cross-sectional area of carbon fiber is:
150×2×0.85=255mm2 >213.72mm2
Therefore, in the south side of the post-cast strip of the floor, the double-layer 150 mm wide spacing 200 mm long carbon fiber reinforced polymer(CFRP) sheet is glued to meet the reinforcement requirements.