Civil Engineering Reference
In-Depth Information
1.0
F bt
F bU
F bv
F vU
1.0
FIGURE 9.15 Bolt shear and tension interaction.
(solid line) and Equation 9.39
F bt
F bU
2
F bv
F vU
2
+
=
1.0,
(9.39)
where F bt is the ultimate tensile stress under combined shear and tension; F bU is
the ultimate tensile stress under tension only; F bv is the ultimate shear stress under
combined shear and tension; F vU is the ultimate shear stress under shear only and is
equal to 0.62 F bU (see Equation 9.19).
Therefore, Equation 9.39 may be expressed as
F bt
F bU
2
2.60 F bv
F bU
2
+
=
1.0.
(9.40)
Equation 9.39, in terms of allowable stresses, is
σ bt
f bt
2
τ bv
f bv
2
+
=
1.0,
(9.41)
where
σ bt is the tensile stress in the bolt (including prying action effects). f bt is the
allowable bolt tensile stress for bearing-type connections or the nominal tensile stress
from pretension for slip-resistant connections and is equal to T bP /A b .
τ bv is the shear
stress in the bolt; f bv is the allowable effective bolt shear stress and is equal to either
f bv for slip-resistant connections (Equation 9.22) or f
bv for bearing-type connections
(Equation 9.19); T bP is the bolt pretension (see Equation 7.17 and Table 9.3) ; A b is
the nominal area of the bolt (1.33 A st ) ; and A st is the effective bolt area through the
threaded portion of the bolt.
 
 
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