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Shear lag and staggered bolts

Shear lag and staggered bolts

Shear lag and staggered bolts

(OP)
Most of the texts out there show the use of shear lag, U, when only part of a tension member is being attached. This accounts for the non uniform stress because there are other elements that are not uniformly tensioned. As an example, consider an angle with only (1) leg being bolted.

Similarly, references for tension members with staggered bolts demonstrate the calculation of the effective net area with consideration of the gage space,s²/4g in the following types of members:
1) flat plates
2) I, C & L shape members that have both flanges and webs being attached; where the member is "unfolded" and analyzed as a flat surface.

My questions are:
If you have a tension angle with staggered bolts on one leg (ie, both legs are NOT being attached), do you:
a. Calculate the net area, An, with consideration of the staggered bolts and THEN apply a shear lag factor to account for non-uniform tension?
b. Only consider the shear lag factor procedure?


Please note: In this scenario, I'm assuming the most critical tension path is through staggered bolts. I'm also assuming block shear is not a controlling scenario.

RE: Shear lag and staggered bolts

(OP)
This is in reference to steel tension members per AISC

RE: Shear lag and staggered bolts

I vote for option A.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: Shear lag and staggered bolts

see the commentary section page 16.1-251 in AISC 360-05, it shows a diagram for this case.

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