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Re: wood framing question[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaoc(--nospam--at)seaoc.org>
- Subject: Re: wood framing question
- From: "wish" <wish(--nospam--at)cwia.com>
- Date: Sun, 21 Dec 1997 21:42:39 -0800
-----Original Message----- From: Kathleen A. O'Brien <wildwoman1(--nospam--at)compuserve.com> To: INTERNET:seaoc(--nospam--at)seaoc.org <seaoc(--nospam--at)seaoc.org> Date: Sunday, December 21, 1997 6:35 PM Subject: wood framing question >Seriously, though, I think it would depend on how you plan to connect them >together. With a double plate, you can connect the two pieces using >standard length nails, but with a triple plate you would run into >embendment length problems with a standard nail. Possibly lag screw would >work. Or through bolts. > >Kate O'Brien, P.E. I might be missing the point, but what is the difference if the spliced chord is the top two plates or the bottom two? The assumption is that the bottom two plates are not doing the job and the contractor does not want to use straps to mend the discontinuity. The purpose of the double top plate is simply to create a continuous tension drag connection with a minimum force equivalent to the code required 4'-0" lap splice and the capacity of the 16d nails at each side of the splice (I don't have the code in front of me and don't remember the spacing or number of nails required). Therefore, it does not seem to matter where the lap splice occurs as long as it occurs in at least two members, one member with mechanical strap connectors (although code prohibits this for bearing wall conditions) or by way of a header or beam that interupts the plate and requires straping at each side to maintain the drag. Therefore, what Kate refers to seems unnecessary - simply forget the bottom plate and work with the top two plates to create the chord. Finally, the shear transfer starts at the diaphragm, to the blocking to the upper plate (the added 2x) and then into the boundary nailing of the shear panel, studs and sole plate, the anchor bolts and holddowns for uplift control - culminating at the foundation for anchorage. (Reminds me of the old Toe bones connected to the ..... song.) The load path is maintained and the chord can develop the minimum required code force. Dennis Wish PE
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