This slide contains how to calculate block shear resistance.

1. 5 Minutes Structure 1

2. Topic –
Steel Design 05
How to Calculate Block Shear
Failure Resistance?
5 Minutes Structure 2

3. 5 Minutes Structure 3
Block Shear Failure Pattern Red Line – Tensile Failure
Blue Line – Shear Failure

4. 5 Minutes Structure 4
Block Shear Failure Pattern Red Line – Tensile Failure
Blue Line – Shear Failure

5. 5 Minutes Structure 5
Block Shear Failure
Causes if tension and shear failure involves
simultaneously.
𝑇𝑟 = 𝜑𝑢 ∗ Ut ∗ An ∗ Fu + 0.6 ∗ Agv ∗
𝐹𝑦 + 𝐹𝑢
2
φu = 0.75 An= Net Area in Tension
Ut = Efficiency Factor Agv = Gross Area in Shear

6. 5 Minutes Structure 6
Ut Value for Block Shear
CISC Handbook Page 2-53
Figure 2-26

7. 5 Minutes Structure 7
Exercise 01 - Block Shear Failure

8. Exercise 01 - Block Shear Failure
End Distance – 40mm
Center to Center spacing of hole = 80mm
Hole Diameter = 22mm (Drilled)
Beam = W460x106 Thickness of Web = 12.6mm
Material G40.21 350 W
5 Minutes Structure 8

9. 5 Minutes Structure 9
Exercise 01 - Block Shear Failure
Ut = 1
An = [80 – (1/2+1/2)*(22+2)]*12.6 = 705.6 mm^2
Agv= (40+80*2)*12.6*2 = 5040 mm^2

10. Exercise 01 - Block Shear Failure
𝑇𝑟 = 𝜑𝑢 ∗ Ut ∗ An ∗ Fu + 0.6 ∗ Agv ∗
𝐹𝑦 + 𝐹𝑢
2
= 0.75*[1*705.6*450+0.6*5040*
350+450
2
]
= 1145.34 KN
5 Minutes Structure 10

11. 5 Minutes Structure 11
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5 Minutes Structure