Slab strengthening

According to the design requirements, in the three-storey underground roof of 4 # garage, the 4-17 axis / 4-G axis to the south of the 4-H axis post-pouring belt, the additional cover iron 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 adhesively sticking steel plate for reinforcement.

Reinforcement of slab by adhesively sticking steel plate

According to the maximum transverse reinforcement area: As=25@200-14@200=490.9－153.9=337mm2

According to the technical specifications of reinforcing bar and Q235B steel plate, the design strength of reinforcing bar is:fy=360N/mm2, strength of carbon fiber cloth: Ff=210N/mm2

 Af×Ff =Asfy 

  Af = fy×As / Ff      

        = 360×337/210      

        = 577.72mm2 

  B=577.72/150=3.86mm  ＜5mm 

Therefore, 5 mm thick 150 mm wide spacing 200 mm long steel plate is pasted on the south side of the post-cast strip to meet the reinforcement requirements.