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# Re: FEMA 350 - Bolted Unstiffened End Plate

• To: seaint(--nospam--at)seaint.org
• Subject: Re: FEMA 350 - Bolted Unstiffened End Plate
• From: Jake Watson <jwatson(--nospam--at)utahisp.com>
• Date: Thu, 27 Jul 2006 20:32:05 -0600

Jason, thanks for your answers. It's always better to understand why the equations work the way the do instead of just assuming they are correct.
```
Jake

Jason Emoto wrote:
```
```1.  The bolts at the compression flange are assumed to carry the entire
shear.  So no tension/shear interaction is considered.

2.  3 is the product of multiplying the 4 bolts at the compression flange by
a resistance factor of 0.75.  AISC publications separate the two terms so it
is less confusing.

3.  The web doubler would have to be mighty thick (1.5" or more on both
sides of the web) before it would start to make any difference.  Increasing
the doubler thickness to reduce the moment arm is probably not an economical
```
solution.
```Jason Emoto

-----Original Message-----
```
From: Jake Watson [mailto:jwatson(--nospam--at)utahisp.com] Sent: Wednesday, July 26, 2006 4:06 PM
```To: seaint(--nospam--at)seaint.org
Subject: FEMA 350 - Bolted Unstiffened End Plate

I spent today creating a calculation template for the Bolted Unsfittened End
Plate connection in FEMA 350.  Going through the procedure in detail again
brought up several questions:

1. Should the bolts consider shear and tension simultaneously like
you normally would in a connection?  See the new AISC spec section
J3.7 and FEMA equations 3-18 and 3-19.  FEMA doesn't check the
interaction.  Should this be considered empirically acceptable
because the connection is tested?
2. Can anyone tell me where the 3 in the bottom of equation 3-19
comes from?  For the life of me a can't seem to re-create that
term.  For those that are interested here is the equation: Ab>=
(Mf/(L-dc)+Vg)/3Fv.
3. Lastly, if I provide a web doubler, can I use a larger "k" term
when checking the column flange?  We usually provide continuity
plates regardless (good detailing practice).  But once and a
while, it would be nice to get the help and leave them out.

Thanks,
Jake Watson, P.E.
Salt Lake City, UT

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