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  • Users: jike
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  1. jike

    The Cost Premium for WT vs WF Steel Members

    If WT's are cut from WF's then they need to be straightened. There are residual stresses in them that cause them to warp. Some fabricators just would rather buy them from a supplier then deal with straightening them. Best way to determine premium is to get a quote from a local fabricator.
  2. jike

    How to price for copies of archived build set blueprints of condo projects that no on else has?

    You might want to contact your insurance underwriter to find out their advice. Are these the original design drawings or as built drawings? A stamp on each drawing stating what they are and what they are based upon at a minimum is very important. For instance, as built drawings are often based...
  3. jike

    Masonry Waterproofer

    Thank you all for your comments. Great information as usual!
  4. jike

    Masonry Waterproofer

    Any recommendations on a good quality, commercial grade, spray-on brick waterproofer? Must be waterproof, breathable and not affect color. Prefer 10 to 15 year guarantee.
  5. jike

    Arch Window Lintel

    If the wall is a bearing wall for the roof above, make sure you include the loads from that.
  6. jike

    Joist Type

    Looks like some kind of cold rolled members. The Architect should know that you need more info than pictures especially if you are making modifications. Need to measure web depth and thickness, flange configuration and thickness and member spacing. Is there any drawings available from Owner or...
  7. jike

    Connection for CMU wall to existing hollow core plank

    Before developing any kind of detail, you must calculate the loads that need to be transferred. For example: lateral wind load on wall, seismic load on wall, load being transferred from hollow core plank to shear wall, etc. If loads are small then don't forget to apply minimum requirements...
  8. jike

    Strengthening New Opening in 2-Way Slab w/ Externally Bonded/Bolted Steel Plate

    Another consideration is if you are bonding the plate directly to the concrete (and using the bolts only to hold the plate in place until the epoxy cures) then you better find out how the epoxy may be affected by moisture and/or fire. If you have a fire rating, you may not be able to use a...
  9. jike

    Strengthening New Opening in 2-Way Slab w/ Externally Bonded/Bolted Steel Plate

    A couple of considerations/comments: 1) If the slab has a fire rating then the steel plates may need to have sprayed on fireproofing. 2) Make sure that the holes are NOT oversized so that the bolts can bear against the steel so the load can get transferred without slippage. Alternates may be a)...
  10. jike

    Slab on Grade

    Although I have been retired for 5+ years, I recommend the book "Designing Floor Slabs on Grade" by Boyd C. Ringo and Robert B. Anderson. It was published by CRSI. I believe you can download a pdf version if you search the internet. The critical bending for a uniform load such as you have is...
  11. jike

    Non Composite concrete floor on Steel Beams

    There are a two other mechanisms that might be working to provide stability. 1) Commonly concrete slabs were formed with wood running to the bottom of the top flange of beams. This would leave a lip of concrete that can bear against the top flange of beams. 2) Also concrete was usually...
  12. jike

    Rubble Stone Veneer Anchorage

    I believe there is a square inch requirement per anchor in the code (I don't remember what it is however), therefore if the 16" oc doesn't work with the stone, as long as you meet the code requirement.
  13. jike

    The art of concrete detailing - stair question

    I would also opt for half as many joints (about every 20 feet). I would also agree on eliminating the joints at the walls and instead dowel into them. Eliminate holes in forms by using threaded rebar inserts or by drilling and epoxying the dowels. Another suggestion might be to eliminate the...
  14. jike

    Elevator Hoist Beam

    Is there enough strength in the precast roof to rig directly off of? If not, can you install the elevator beam above the roof and rig to it thru a hole in the precast roof? Architect will probably insist that beam above the roof be removed after installation and before roofing installation...
  15. jike

    Historical Composite Deck

    This structure looks like it might have been exposed to fire or at least heavy smoke or soot. The mesh was for the plaster that was applied to the bottom of the deck for (I guess) is fire protection. At your description, I thought it might have been a keystone deck but looking at the photo, I...
  16. jike

    Structural - Connecting new footing to old footing

    It would certainly help to know the loads (both of the wall and the new column). What is the allowable soil bearing pressure? Generally, we like to keep the bearing of adjacent footings at the same elevation unless you underpin one footing to keep them at the same elevation. The top of the...
  17. jike

    Cantilever beam on shear connection. Maintenance insisting it works cos they use it

    Another possibility is that it is working but has an inadequate factor of safety legally mandated by the building code. I can see it possibility working with a shear connection if the load is very, very low but if it doesn't check out explain to them that you (and the owner) have a legal...
  18. jike

    Sealing design to be used in multiple locations

    Most states now require that you work under the direct supervision of the EOR. This does not sound like the case and you and the EOR could get into trouble. Further, it should be you or the EOR that determines the required loading, not the client. If it is a load that works for all sites then...
  19. jike

    Garage floor and driveway replacement issues

    If water is coming under the garage door, then I agree with others that a section would have to be cut out and repoured with a trench drain outside and at least a 1/2" stepdown lip at the outside face of the garage door. The new section should be large enough to positively slope all new concrete...
  20. jike

    Who's responsible for wood blocking at windows and storefronts

    In my former world (I'm retired), it was covered on the architectural drawings and the architectural specs (rough carpentry?) and the GC would provide it. It was never part of the CFS or other structural work.

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