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RE: Joists welded to supports

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In addition to using screws to attch the deck, you may also want to consider Hilti pins.  They are used in many places where weather may not allow an adeqaute window to weld the deck down.
There are some issues you need to consider when using these pins which inlcude:
1.  Cost - The contractor will need to obtain the appropriate pneumatic guns and the compressors used to set the pins, although Hilti will sometimes allow a contractor to use their equipment.  The contractor will also need to train his employees, although the Hilti representatives will do so for free.  The cost of the pins has been the largest issue.  On one job with 140000 SF of deck, the pin prices were estimated to be $25-30 K vs a welding rod cost of $1K.
2.  Shear capacity - A pin connected deck will have reasonable shear values, but they are less than for a comparable welded deck.
-----Original Message-----
From: Javier Encinas [mailto:jencinas(--nospam--at)]
Sent: Thursday, September 19, 2002 6:00 PM
To: seaint(--nospam--at)
Subject: Joists welded to supports

I'm currently working in a building expansion in an industrial plant. Due to safety reasons, field welds must be avoided as possible. The design includes roof joists and metal deck. Does anybody know if the joists can be attached to the supporting beams with bolts instead of field welds? I have never seen that before. Regards,
Javier Encinas, PE
Encinas Associates