Rafter Bearing and Anchorage … So, of course, the rafters need to `bear’ on (be supported by) something. For Linda’s Goat Barn the rafters will rest on `headers’. The design of the barn, remember, is `pole barn’, e.g., rafters supported …
As an engineer I tend to design structures from the top down. First the roof loads, which determine rafters, or trusses, or whatever roof framing members. Then the beams/headers/girders supporting the rafters, then the columns or walls supporting the headers, …
on headroom (c) Jeff R. Filler, 2021 … last year I built a chicken `palace’ (huge coop) for my wife, actually for her chickens. I made sure I found out how high she wanted the roof. It would slope downward, …
Jeff R. Filler, (c) 2021 The dead weight deflection of a beam, rafter, etc. is the amount the beam deflects, bends, sags, due to the `dead weight’ of the things it is carrying, including itself. Going back to the example …
… now for `deflection’ … So far we’ve been dodging the `deflection’ issue. `Deflection’ of a beam, rafter, girder, header … is how much the beam `bows’, or bends. For a beam or rafter supported at it’s ends, the deflection …
Okay, now let’s do a (free, online) check of the concentrated load situation. Note that I am looking at the concentrated load separately from the uniform 20 psf live load … yeah!, the two loads are not taken to act …
Now let’s check our roof rafter design. Recall that we (I) came up with 2×6 rough sawn (actual dims) stressed to 900 psi, which is probably doable in SP lumber, and likewise doable with 2×6 dimension lumber, but because the …
What makes for successfully obtaining a code evaluation report? (c) Jeff R. Filler, 2021 The use of building products in construction that are not described in the building code, or not described completely in the building code, generally requires the …
Designing a roof rafter … (bending stress) … Linda wants a barn-shelter for her goats. Okay – I’ll do it. `Twelve by twenty-four.’ `Let’s go walk the site. It’s got some slope. I’ll make a stepped-barn, each section will be …
Miles asked me to design a truss for his shop. I grabbed my clipboard. Wood? Yes. Rough sawn? Yes. Rise/Run? 4/12. Width? 21 feet. (Hmmm … I am sketching as we go along.) Oh, 20. You mean 20 to center? …