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Section 3.9
Tension Limit State Summary
Last Revised:
06/16/2011
Serviceability Limit States:
| Limit State |
Specification |
Limit |
| Slenderness |
D1 |
L/r < 300
or
r > L/300 |
Strength Limit States:
All strength limit states take the form:
| LRFD |
ASD |
| Pu < ftPn |
Pa < Pn/Wt |
| Req'd Pn = Pu/ft
< Pn |
Req'd Pn = Pa
Wt < Pn |
| Pu / (ftPn)
< 1.00 |
Pa / (Pn/Wt)
< 1.00 |
Rn (nominal resistance) is often used in place of Pn
(nominal axial strength) in the equations above.
| Limit State |
Specification |
Nominal Capacity |
Typical Design Variables |
f |
W |
| Tensile Yielding |
D2(a)/J4.1(a) |
Member Capacity: FyAg |
Stl Type, Section |
0.90 |
1.67 |
| Tensile Rupture |
D2(b)/J4.1(b) |
Member Capacity: FuAe |
Stl Type, Section, Bolt size, Bolt Layout, Section
modifications |
0.75 |
2.00 |
| Block Shear |
J4.3 |
Capacity per connection: min(0.6FuAnv + UbsFuAnt,
0.6FyAgv + UbsFuAnt) |
Stl Type, Section, Bolt Size, Bolt Layout, Section
modifications |
0.75 |
2.00 |
| Bolt Bearing |
J3.10 |
Capacity per bolt hole: Std Holes, Defl
an issue:
min(1.2 Lct Fu, 2.4 dt Fu)
Std Holes, Defl not issue:
min(1.5 Lct Fu, 3.0 dt Fu) |
Stl Type, Section, Bolt Size, Bolt Layout, Section
modifications |
0.75 |
2.00 |
Notes:
- See SCM specification D3 for requirements for computing An,
and Ae.
- SCM specification J4.1(b) places an upper limit of 0.85Ag on
An for connecting elements.
- Multiple failure paths may need to be considered for Tensile Rupture and
Block Shear.
- The least bolt bearing value in a connection controls the bolt bearing
strength of the member.
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