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  1. Greenalleycat

    Forum Clutter - Students (and others) posting in this forum

    I don't mind someone posting a genuine engineering question that is thought provoking, particularly if they're wanting to understanding engineering principles better themselves I take a very dim view on: a) students blatantly posting their homework b) people blatantly wanting free professional...
  2. Greenalleycat

    Basement Bearing Walls Positioned On The Edge Of Footing (residential 3 stories)

    This type of construction is done all the time in residential and commercial. Usually people don't want footings sticking outside the building line so you're stuck with the wall on the edge of the footing regardless. I've never personally checked the eccentricity and resolved it into the slab...
  3. Greenalleycat

    For fun, how would you analyze this joist?

    That thing is awesome, I want one in my house If I was actually analysing it, I don't think it would be too hard to rough it out Looks like all the rods are aimed at a common node (for each junction) so I'd model it on that basis Ignore the gusset and check those separately by hand at the end It...
  4. Greenalleycat

    Load carrying capacity of 15x50 s beams?

    From what you've described, your bridge sounds unsafe so I doubt there is a way to calculate a 'safe load'. So the best thing is probably to shut the bridge. Bridge failures can and do happen....I had a client with a similar sounding bridge to yours that got broken because a fire truck ignored...
  5. Greenalleycat

    Load carrying capacity of 15x50 s beams?

    This may take the cake as the stupidest post I've seen on here You've given us enough information only to say that it sounds like your bridge is absolutely poked and you need an expert opinion ASAP Even if you'd given more info, what were you expecting? A bunch of international engineers to...
  6. Greenalleycat

    Concrete wall with encased column

    Steel column then wood above maybe? Sounds like a recipe for disaster casting timber in tbh Will the wall rely on the column for support?
  7. Greenalleycat

    Steel Beam size vs Wood

    Sounds like "your friend" has cooked up a scheme and now wants internet engineers to engineer it for free Suggest that you pay "your friend" to do a professional job
  8. Greenalleycat

    Manager Says Keep the Restraints — I Think They’re Unnecessary. Who’s Right?

    @ALphaSpace if you've allowed for the moment and the axial load and the cantilever column effective length...why are you using a 200x16 SHS that is ~2.5x the strength it needs to be? Surely you could adopt a more economic section Considering that you have a column either side + welded beam and...
  9. Greenalleycat

    Manager Says Keep the Restraints — I Think They’re Unnecessary. Who’s Right?

    Choras, it looks to me that the column is used to support the 2 flights of stairs and has beams welded off to take the load These will prevent buckling in that direction In the other direction there is no restraint therefore the design has two 'restraint beams' at each level - these are the ones...
  10. Greenalleycat

    Manager Says Keep the Restraints — I Think They’re Unnecessary. Who’s Right?

    It looks like the axial load is applied quite eccentrically to the column? Is that factored into your assessment
  11. Greenalleycat

    Steel Deck Cantilever

    The only thing that comes to mind is that this is probably appropriate for a UDL but may not be appropriate for a point load Wind uplift on a metal deck - sure Footfall at the end of a cantilever? The local effects of the point load may cause a different failure mode to govern This insight...
  12. Greenalleycat

    good reference for alterations of existing reinf. CMU walls?

    Braced frame could be channels with their webs against the block and bolted into it Doubt you'll get a (reasonble) moment frame to be stiff enough to compare to a wall Could look at building new pilasters at the ends of your openings to frame them out and create boundary elements for the wall...
  13. Greenalleycat

    good reference for alterations of existing reinf. CMU walls?

    I'm not aware of a specific reference. I don't think one is needed though: working through this rationally is what engineers are paid for I work in a high seismicity country so am familiar with the intricacies but not US specific stuff Issue 1 - providing appropriate gravity support to your new...
  14. Greenalleycat

    Paradoxical strut-and-tie tests (less = more)

    I went to an S&T presentation a few years back that showed different but very similar testing with the same results I recall that the explanation is that the narrow shape of the compressive element constrained the compression shape from fanning out and limited the transverse tension strain This...
  15. Greenalleycat

    Temporary Plate to Hold Anchor weight

    what is your question?
  16. Greenalleycat

    Strut and Tie

    Getting philosophical, all ties are diagonal if you rotate your piece of paper
  17. Greenalleycat

    Pilaster minimum reinforcement

    Interesting article, thanks for that
  18. Greenalleycat

    Raft on piles

    Are the walls underneath the slab or above it? You have to be very careful with mixing and matching raft/piles and walls/strip footings I have been dealing with a damaged house that has a basement with this system...the walls have settled far more than the piled foundations and there is now a...
  19. Greenalleycat

    Anchorage of Positive Moment Reinforcement

    No I don't agree with that. The point is to ensure that some steel is fully developed...doubling the steel and putting in shitty development length on both doesn't meet this requirement Also, I suspect that the development length required is more than 230mm? You have 12db PLUS a cog (which I'm...
  20. Greenalleycat

    Eccentric Pad Footing with Tie Bars?

    This is my guess as well, though I'm dubious of this detailing in practice That said, I've seen similar (and worse) detailing here in NZ and haven't observed issues yet...

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