Limit state of collapse shear (1).pptx

1. Limit state
of collapse
shear

2. SFD BMD For
Two Point
Loading

3. Shear Stress
distribution diagram

4. SFD BMD For UDL

5. Effect of shear on beam

6. Effect of shear on
beam

8. Types of Shear
Reinforcement
• Vertical Stirrups
• Bent up bars
• Inclined Stirrups

9. Critical section for
shear
• Critical section for shear is that
section at which the shear Force is
maximum
• At a distance ‘d’ from the face of
the support where the support
offers compressive reaction

10. Critical section
for shear
• At the face of the support
where the support offers a
tensile reaction

11. Design steps
• Calculate Shear Force Vu
• Calculate Nominal Shear Stress Ꞇv=Vu/bd pg no - 72
• Calculate Ꞇcmax Maximum shear stress in concrete Ꞇv < Ꞇcmax otherwise
change section pg no – 73
• Calculate Design shear strength in concrete Ꞇc pg no – 73
• If Ꞇv < Ꞇc minimum shear reinforcement pg no – 48
Sv = 0.87fyAsv/0.4b
OR
If Ꞇv > Ꞇc Shear Design required Vus=Vu- Ꞇcbd

12. Design steps
• Shear Design Sv=0.87fyAsvd/Vus pg no - 73
• Detailing

17. Shear
Design
• b=250mm, d=450mm,
Ast=4-16mm dia, M20
Fe415 V=150KN service
load

23. Shear
Design
b=300mm, D=500mm, Ast=3-
20mm, Fe250, d’=50mm,
V=100KN, M20

27. Shear
Design
b=230mm, D=750mm,
W=34.5KN/m, L=10m, Ast=6-
25mm, Fe415, M20, d’=70mm

35. Design
Shear
b=250mm, d=500mm,
Wu=50KN/m, L=6m,
Ast=0.75%, M20, Fe250,
bw=400mm

42. Shear
Design
b=300mm, D=500mm, Ast=3-20mm,
Fe250, d’=50mm, V=100KN, M20 bending
1 bar of 20mm diameter

50. b=300 d=600mm Ast=5no 25mm dia,
w=80KN/m, L=6m, 2 bars are bent , M20 Fe415