Q1
Determine the factored resistance of a 120×120×8 equal leg of 350W connected with 3 class 8.8 M20 bolts to a column. All holes are drilled and the edges are gas hit.
Pitch=60mm
Edge=30mm
End=30mm
Calculate :
i). spacing configuration
pitch=2.7d
Edge=1.35d
End=1.5d
ii). Yield Resistance
Tr=0.9Agfy
iii). Fracture Resistance
Tr=0.85×0.9×A'ne×fu
a). Tearing across the pitch (path 1)
d=(M20+2)mm
An=Ag-(1×diameter of hole×thickness of section)
Ag from table of Equal leg
b). Tearing along the diagonal (path2)
An=Ag-(2×diameter of hole×thickness)+(s^2/4g)×thickness
Ag from table of equal leg
v). Bolt shear
Vr= 0.7[0.9×Ab×0.6×fu]
m=1 for single
m=2 for double
iv). Bolt Bearing
1st a>3d
Br=3×0.67×t×d×fu per bolt
t=8mm
d=20mm
2nd a<3d
Br=0.67×t×afu per bolt
t=8mm
d=40mm
Total Br=3Br

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