Design of shear Reinforcement

First read👇👇👇

Types of shear reinforcement bars

1). Shear stress is calculated on the bases of external shear force.

حv = V/bd

v = External shear force

B = width

d = effusive depth

2). max shear stress depends upon grade of concrete only

حcmax = 0.631 √Fck

3). The shear stress depends upon grade of concrete & quantity of steel (% of steel)

%p =( Ast/bs)×100

4). if حv < حc ➔ min shear R/F is provided & the amount of shear R/F can be 

calculated by

(Asv/bSv) > 0.4 /0.87fy

5). If حc < حv < حcmax

➔ shear force(Vc) = حcbd

• additional shear (Vs) = V-Vc , 

 Where V= total shear

Spacing (Sv) = 0.87fyAsvd/(V-Vc)

 

• Max. spacing

 1). 0.75 d (Vertical stirrups )

2). d( inclined )

3). 300mm 

Which is less

6). If حv > ح emax

➔ Redesign the given section of beam

➔ increase the depth of beam section