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  • Users: fp23
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  1. fp23

    Basement to walk out basement conversion

    1- I would check this header as unreinforced concrete. If it's lightly loaded it might work but 6' is starting to feel a little long for my gut feel. If it doesn't work I would bolt a channel to the face of the concrete that hides inside the furring wall, this way you don't have to overcut the...
  2. fp23

    Glass Railing Follow up questions

    I originally made a post about a glass railing here. I'm designing a glass railing for a custom stair that will be supported by round standoffs and will have a custom 3/4"x2" handrailing above the glass. I have a few follow up questions. -For those of you who design these railings in Risa, do...
  3. fp23

    Vertically stepped wood diaphragm

    I think XR250 has the right idea. Or a beam or girder in line with the wall. That seems like a weird truss profile to me. Also, if your loads are light enough, drywall has shear capacity as well so you ceiling may help you.
  4. fp23

    Using Equipment next to an existing retaining wall

    Thanks JAE and MTSOE. Yes it's essentially a 28'x30' 12" prestress concrete plate that is pinned on 4 sides with soil loading for the full height. There isn't a drivelane or any kind of vehicle access next to the wall (at the top) but i think it's likely that small snowplows have been driven all...
  5. fp23

    Using Equipment next to an existing retaining wall

    I'm working on a TI project on an existing precast concrete building. Our work is on the main floor (mostly just a new door opening in a non-structural wall) but below this is a 28' tall retaining wall (2 stories of basement with no floor bracing it except at top and bottom). They are demo'ing...
  6. fp23

    Air Content in residential concrete

    Thanks pham. Why do you use 6% air for F1?
  7. fp23

    Air Content in residential concrete

    Thanks all, helpful to get some other opinions. I think I'm going to leave it on there and see if I get pushback from anyone. Like TRAK said, i'm guessing that residential concrete subs are just going to keep using whatever mix they always do.
  8. fp23

    Masonry Chimney for Beam Support

    If it were me I would avoid framing into that chimney. I would do a flat beam at N-S walls plate height in front of the chimney and a king post down to it from the ridge. Or a bent steel beam. that way you might be able to avoid adding load to the existing foundation too
  9. fp23

    Air Content in residential concrete

    What do you all call out for air content in residential concrete? Specifically foundation walls and footings. I've been revamping my general notes and have seen other engineers specify no air, 5-6%, or not mention it at all. No air seems to be the most common. Based on the ACI I'm coming to the...
  10. fp23

    Concealed Flange Hangers

    For light loads (under 1k) it doesn't bother me too much. I've used it in this orientation a lot and haven't ever noticed splitting but I can't say I've been looking out for it. A simpson rep told me once that they use a factor of safety of 4 on their hangers and I usually scale down my hanger...
  11. fp23

    Shear wall design in small residential homes

    @davidl13 I live/work in a high wind area. My process for this is to do a quick lateral analysis of the building using the SDPWS (once you've done this a few times you can do it pretty fast). Most of the houses around here pre 2000's are primarily held up by drywall from a lateral perspective...
  12. fp23

    Structural glass design without FEM

    Thanks for all the great responses. This is all super helpful. I've got a lot of reading/research to do now. I'm also waiting for a call back from Risa and will let you know if I find out anything informative.
  13. fp23

    Structural glass design without FEM

    Thanks Koot! I appreciate the starting point. It's definitely a little overwhelming to try and figure out where to start with glass.
  14. fp23

    Post at edge of footing

    Assuming that you aren't having bearing or frost protection issues with that detail. One idea is you could do a steel embed plate and then weld a knife plate to it with thrubolts into into the post? Or you could drill epoxy anchors through the post and into the foundation wall.
  15. fp23

    Structural glass design without FEM

    I'm being asked if I can design a glass railing for a client. I'd like to learn glass design and I don't mind eating it on my fee to break into it, but this project doesn't warrant buying an expensive software like RFEM. My project would be a glass panel system with 2 circular glass clamps at...
  16. fp23

    Mono Stringer with thin HSS tube

    @Greenalleycat - Thanks for your example. Fortunately I have a pretty solid tread configuration with a flat plate that extends almost to the edge of the tread and a vertical fin on the front that stiffens it up. I have done treads in a similar way to your example before and had the same...
  17. fp23

    Mono Stringer with thin HSS tube

    Good points and thanks again for your thoughts on this, they've been very helpful. At the 2 points where I'm connecting into wood floors I will definitely have them add blocking and coil strap to drag some horizontal load into the diaphragm.
  18. fp23

    Mono Stringer with thin HSS tube

    Unfortunately the handrails will be attached to a wood wall primarily. I agree that the welded angles won't help much for torsional strength but they do almost double my Ix (transformed section) which makes a notable difference in the AISC vibration calcs, about 20% increase in Hz. Thanks for...
  19. fp23

    Mono Stringer with thin HSS tube

    @KootK thanks for your insights. I'm using Risa 3d which does have a setting that you can turn on to account for torsional warping so I think I'm set there. I also have some extra stiffness left unaccounted for from the L4x4 angles that are welded to the top which makes me feel better. As far...
  20. fp23

    Mono Stringer with thin HSS tube

    @Phuduhudu Thanks for your response! I do have seperate load cases set up where each tread is only loaded on one side. The 300# pt load is producing the worst deflection because I modeled it right at the end of the tread. Thanks for the article too, I like the idea of using a smartphone to...

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