Types of shear Reinforcements 

1). Shear reinforcements are used to resist external shear & growth of inclined cracks.

2). it is used to connect the compressive reinforcement & tensile reinforcement. these bars are of 3 types.

Credit:- Google

i). vertical stirrups

• These bars are provided along depth of section in vertical direction. 

• These bars are provided in the form of stirrups

Area of steel in (Asv) = no of legs x area of one bar shear

dia of bar = 8mm, 10mm, 12mm

Shear Force , v = stress x area

 

= 0.87 fy ×(no of stirrups x Asv)

V = 0.87fy×Asv(𝑑/𝑠𝑣)

SV = 0.87fyAsvd/

 

Where, Sv = shear R/F for vertical stirrups 

V = External shear force

d = effective depth of beam

Asv = area of steel in shear = n x π/4(∅)2

fy = Yield stress

II) inclined stirrups 

• these bars are used to resets diagonal tensile cracks. 

• these bars are incline at inclination of 45°

• The spacing of bars should be such that it fulfills the shear requirement 

•  α = angle of inclination of bars (45°)

iii). built up bars

these bars are the main tensile reinforcements which are bent at 45°

from horizontal 

• the min steel area is provided in tensile zone at supports to resist external 

bending, if exists

• Min 50% contribution of bars takes place during built – up

Sv = 0.87 fy As vd (cosα+sinα)/V

Also read Design of shear reinforcement bars