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RE: Bar Joists parallel to masonry walls

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Jim,
 
   One way to handle the camber issue is to specify joists with a special camber next to the wall. Depending on your joist spacing you might want to specify special camber for the last two joist--say 1/2" next to the wall and 1" for the next joist. If ponding is an issue have the joist manufacture make the joist stiffer. To handle the joist deflecting from snow load, consider terminating your deck to an angle with vertical slots. The angle can then be attached back to the wall with expansion anchors.
 
 
Wesley C. Werner
-----Original Message-----
From: Jim Wilson [mailto:wilsonengineers(--nospam--at)yahoo.com]
Sent: Friday, August 13, 2004 10:55 AM
To: seaint(--nospam--at)seaint.org
Subject: Bar Joists parallel to masonry walls

I am debating two opposing details for placing a bar joist adjacent a masonry wall.  Its quite common to see bar joists parallel to masonry walls set off from the wall by 6" or so.  But it seems to me, however that this will cause installation problems with the metal decking as well as performance issues under loading.
 
If a 60' span joist has 1 1/2" camber for example, how can the metal decking be successfully attached to the top of the masonry wall without either bending the deck or tapering the top of the wall.  This connection is imperative to transfer diaphragm shear to the shear wall.
 
Secondly, how can the joist deflect under snow/live loads without fatiguing the deck welds and ultimately causing some type of failure at that location?
 
Am I being too picky or am I just seeing some bad details?  It seems to me that the joists should be set off from the wall the same distance as the typical joist spacing to keep the necessary flexibility.
 
Regards.
 
Jim Wilson, P.E.
wilsonengineers(--nospam--at)yahoo.com
Stroudsburg, PA
 


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