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RE: Combined Shear and Tension on A449 Bolts[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
- Subject: RE: Combined Shear and Tension on A449 Bolts
- From: "Carter, Charlie" <carter(--nospam--at)aisc.org>
- Date: Fri, 13 Sep 2002 11:20:41 -0500
>I am interested in combined tension and shear stresses for
>Grade 5 and Grade 8 bolts. I think that the Grade 5 bolts are
>similar to A449 and the Grade 8 are A354 Grade BD. For A449
>bolts, Table J.3.3 of ASD 9th edition has a formula for calculating
>the allowable tensile stress in bolts greater than 1 1/2" diameter
>subject to shear.
>If I have 3/4" Grade 5 bolts, should I just use fa/Fa + fv/Fv <1.0
>using Fa = .33Fu and Fv = 0.17Fu?
That interaction equation is a straight line, whereas bolt shear tension interaction is better represented by an ellipse, such as equation 5.2 in the RCSC Specification (a free download at http://www.boltcouncil.org). If you rewrite it as (fa/Fa)^2 + (fv/Fv)^2 <= 1.0 for ASD, you get the equations that are in Appendix B of the RCSC Specification. The general form should work for A449 bolts, too.
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