Question: at what lower value of pitch does a roof cease to be properly considered as a mono-slope roof, and instead be considered a flat one in a wind context? Chapter 28 of ASCE 7-10 (page 239) includes a grey box "User Note" that establishes that the Envelope Procedure/Part 1 is for buildings...
JTPE's original post sounds exactly like what was occurring in this office recently. Using RISA 3D and braces in tension only, the model did not converge. This was a stairs tower, not a transmission one. We eventually tried putting in ridiculously large members for diagnosis, but it would not...
The sketch indicates that the post is notched to fit over the beam. Beyond the question of net versus gross section to use in the flexure formulae is the matter of lumber grade degradation. The notch may remove the "cream" from the section of wood, leaving behind a defect-filled area. You can...
Long thread--I didn't read it all; however, it looks like you're talking about dimension lumber trusses that fall into the TPI Standard category, albiet with plywood gussets and loose fasteners. This type of truss is more properly seen as a frame, i.e. there is continuity across the joints on...
I understand that the question is along the lines of when can you use a screw with a #1 point; when do you have to use a #2 instead of a #1, when do you have to use a #3 instead of a #2, right? Here's what the Cold-Formed Steel Engineers Association has to say in Tech Note TN-565c:
Format...
Whether in your judgment there should be 1", 1-1/2", 2", etc of axial load eccentricity accounted for should be considered. Using my spreadsheet to experiment with different sizes of DF-L SS, it appears that the size or whether anything reasonable will work at all depends heavily on the...
At a local ACI chapter meeting, I heard a speaker for a steel mesh company located in Ohio. He showed pictures of slender, tilt-up walls for buildings at his company's manufacturing site. No rebar was put in the walls, and it was simply amazing. The downside is that this practice is not...
