Recent content by OldPaperMaker

The equations for calculation C sub L are found in Section 3.3.3 of the 2012 NDS. Examples of the calculations can be found in the Beam Design chapter in the book Design of Wood Structures by Donald Breyer, et al

ajk1, See "Notes", item #9 of Figure 28.4-1 this defines "a" as 10 percent of the least horizontal dimension or 0.4h, whichever is smaller, but not less than either 4% of least horiz. dimension or 3 feet (0.9 m)

Go to Table 4.3C of the AWC SDPWS-2008 (American Wood Council Special Design Provisions for Wind & Seismic-2008 edition)

Signious, You might want to provide a sketch of the elevation & cross section of this wall to make sure that we are all talking about the same thing.

medeek, I think that chapters 13 and 14 of the book that you mentioned does the best job of explaining design of portal frame design. For more information check out the "References" at the end of those two chapters in the book. The APA information is all available on line, for free, at...

medeek, If you go to the internet and type in "ilevel residential wall guide" that will take you to Weyerhaeuser's specifier's guide to walls that you have shown in your sketches and drawings. The guide has a lot of typical details that might help you in your design.

xyyy, For Simpson Strong Tie fasteners see page 25 of Simpson Wood Construction Connectors C-2013. Be sure and read the footnotes about wind design, etc.

JAE-very good explanation! For a detailed example see Example 3.10 on page 3.34 of Design of Wood Structures (sixth edition) by Donald E. Breyer, Kenneth J. Fridley, Kelly E. Cobeen, David G. Pollock

Look in the 2008 Edotion of AWC SDPWS-2008. For Wood Framed Diaphragms it is found under footnote 2 of Table 4.2A on page 18. For Wood Framed Shearwalls it is footnote 2 of Table 4.3A on 31. The specific gravities of various wood species is found in NDS-2012, Table 11.3.3A on page 81.

ajk1, Is there some reason that haven't mentioned adding a new footing and post either at mid span or under the spliced plys? This may reduce the stress enough so that two plys will definately handle the loads.

ajk1, 1. I assume that 2 of the 4 plys don't have the required capacity in the 11' span and you did not design the existing beam. 2. You noted in your first post that this beam is supporting a floor, a loft, the roof and two walls, so it is a key component of the support for the house. 3. As...

ajki, I think that the attachment didn't coperate and go into the "attachment" mode

ajk1, I don't think that I understand how this thing is framed. Do you have (2)-2x12 in the center that are 11' long and (1)-2x12, each side of the center plys that has 2 segments that are 8' & 3' long that are somehow attached to the center plys? If so, then the 2 outer plys won't supply any...

ajk1, You might want to attach a sketch of the way this thing is framed.

In the 2012 NDS, in the "Notation" section (on page 6) you will find a written description of what those Z values and subscripts actually refer to.