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  1. JStructsteel

    Shoring OSSJ with wood?

    Got some steel joists with a slab on top to shore while the wall is removed and beam installed. My plan was 4x4 under the top chord about 6-8" back from the support, and that be supported by a wood wall. I dont want to goto bottom chord due to reversal of forces. Anyone see an issue? Perhaps a...
  2. JStructsteel

    Cold Formed Joists

    Designing a job with cold formed joist. Contractor is not sure who will be supplying. Would the best thing to do is provide reactions for the connections, and let the supplier/manufacture provide connections, as such not to make it more expensive with a custom connection?
  3. JStructsteel

    RISA3D help

    Having an issue with RISA3D and Pdelta. My model is attached. No outrageous loads, just 10psf DL and 20psf LL. Moment frames 4 directions. It gives me alot of locked nodes for My. If I do Pdelta analysis, wont even run. Anyone good with Risa3d and see anything out of the norm?
  4. JStructsteel

    Flange plate moment connection

    For a flange plate moment connection (W27x94) is there a min clearance between the beam flange and the plate?
  5. JStructsteel

    Lightweight Cellular Concrete

    Using Elastizell behind some retaining walls. Anyone ever use it? How do you handle surcharge behind the wall, do you assume that it would end up on the wall via the cellular concrete?
  6. JStructsteel

    Moment frame connection

    Got beam attaching to an existing column and needs to be a moment connection. They didnt pre-drill holes for future, so going will welded. My first thought is a angle for setting the beam welded to existing, and they set the beam and bolt for temporarily. Come back and weld angle to new beam...
  7. JStructsteel

    Cold Formed Steel naming

    Question on naming cold formed steel. Should I be using the SSMA nomenclature, or AISI, or can I use both? Designing with Software, it lets me pick AISI, SSMA, Dietrich, or Dale Incor. What is the "generic spec" I should use?
  8. JStructsteel

    Backfill/soil requirements on drawings

    How much specification wise do you folks show on the drawings? Do you have a min requirement for back filling behind walls, around footings, under slabs, etc? Min compaction requirements? Moisture content? lift heights? Or is it better to leave that to the geotech report i.e. "All soil back...
  9. JStructsteel

    decks

    IBC really has nothing on decks. For a multi story deck, is the preference to use full height column, and secure the ledger beam to the column, or notch the column? 4' x 8' decks up an apartment building.
  10. JStructsteel

    Footing capacity after 35 years

    Would an existing wall footing (or really the soils) have additional capacity after 35 years from consolidation? I have a wall footing I want to add some load to. Current design pressure is 2000 allowable bearing. Its maybe got 900lbs/ft currently (including footing weight). I want to dowel...
  11. JStructsteel

    Strap bracing for roof purlin

    Looking at options for bracing ZS purlins, and came up with strap bracing over bolted or welded angles, etc. Anyone ever done this? Would it make sense to call it out continuous, i.e. they just weave it in and out each space? Then lap at a joint as needed? Thanks
  12. JStructsteel

    Zee purlin fixity

    Anyone have advice on Zee roof purlin fixity. I see usually they are designed as a fixed connection. I have read 10-20% lap is adequate. 20% would be 5'-0" which seems reasonable but also not. I was thinking 2'-0" each side. 2 bolts each end, then clip at the beam w/ 2 or 4 more bolts. Thoughts?
  13. JStructsteel

    Cable bracing for a building

    Got a 14 bay @ 25' building additon x 1 bay at 65'-0". Any advantage to where to put the X bracing along the long length? It has 1.5" B deck on the roof. I was thinking first and last bays. Any better places, door and window permitting?
  14. JStructsteel

    Truss Reactions

    So got truss reactions as a lump sum, i.e. not broken into DL, LL, WL, etc. Is it worth figuring out the components, or just design for the total reaction using ASD? I asked for the component reactions, but got no reply. Thanks
  15. JStructsteel

    AISI S100 Design

    Going thru a wall girt design for a steel building. Looking at C girts. Looking at table I6.2.1-1 for a 9" girt, looks like I have to use a 0.40 reduction? That seems drastic, what am I missing. Outside wall will be metal panels.
  16. JStructsteel

    Top of column moment connection

    Got a moment frame, and its for a fabricator building an addition. They were asking why I was doing a end plate moment connection over having the beam on top of the column. I have not designed the connection yet, but in my mind, the end plate welded on the beam (W27) is better for strength than...
  17. JStructsteel

    Cold formed Cee beam identification

    See picture, any idea? To me its a 5" Cee girt (pictures confirm a Cee) but no idea on other numbers.
  18. JStructsteel

    Adding on to a moment framed structure

    Im working on a project where they are adding on a bay (65'-0") to an existing structure that is 190' +/- wide already. They are moment frames (not a metal building) but WF columns and beams. Would it be best to do a simple beam connection at the existing, and let that frame take the load, or...
  19. JStructsteel

    Mold Growth?

    What would you call this white stuff on the walls? Some sort of mold? Also, what causes a spall like this, just a bad outer coating? Its a basement with water issues (standing water on floor). Seems they but a parge coat over the wall, now chipping off. Im thinking its a stone foundation they...
  20. JStructsteel

    Out of state engineer, local resident wants me to do an inspection

    So a resident had a local basement wall company do a inspection, and engineering for a repair. The engineer that stamped it didnt come out, just went of the company rep that looked at it. They got drawings, got a permit, but their mortgage company wont sign off unless a engineer does a...

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