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  1. Eng_Struct

    Foundation Wall for Building on Fill

    Sounds like for the strip footing system to work, I need: 1. Find the load path through the slab in tension either via friction or tie to the foundation wall on the opposite end. (I only have 16ft of building length so there is not much to rely on friction - I will may introduce a key at the...
  2. Eng_Struct

    Foundation Wall for Building on Fill

    If I have to make it work, I will reinforce the slab on grade and tie the new slab using Hilti into the existing building foundation wall. Essentially the slab works in tension. The other thing I will need to consider is the passive pressure on the outside to make it work. I want to design it...
  3. Eng_Struct

    Foundation Wall for Building on Fill

    Thank you everyone for the feedback. Yes, the designer in the example I have provided appears to have specified the shoring of the wall before the placement of the slab. My question is if I do specify shoring of the wall and tie it at the top, does the wall become simply supported with...
  4. Eng_Struct

    Foundation Wall for Building on Fill

    Hi Group, I'm working on the design for a new expansion to an existing building. On the expansion side, the exterior grade is approximately 4 feet lower than the interior slab-on-grade elevation. The original building, constructed around 20 years ago, uses a standard strip footing and a...
  5. Eng_Struct

    Cutting Door Opening Through Existing Precast Siding Panel

    Hi Group, The owner wants to create a new door opening 8ft x 8ft through an existing exterior precast concrete panel. In the past, I have reached out to the precast siding supplier who installed the panels and have them detail the reinforcing for opening. The panels are 20ft tall and very...
  6. Eng_Struct

    Replacing Portion of Slab-On-Grade of Pre-Fab Metal Frame Building

    Correct. Can you please refer me to the clause/section of the code ?
  7. Eng_Struct

    Replacing Portion of Slab-On-Grade of Pre-Fab Metal Frame Building

    The joint will be perpendicular to the thrust force. I don’t have any way to make the reinforcement continuous across the joint between new and existing, therefore relying on hilti dowels to carry the tension across the joint. There will be slab friction but i am trying to resist the load by...
  8. Eng_Struct

    Replacing Portion of Slab-On-Grade of Pre-Fab Metal Frame Building

    I was thinking of putting struts on the outside of the building 6ft above the base of the column with deadman anchors (concrete block etc). I want to rely on friction but part of me thinks that the vapour barrier will reduce friction negating any beneficial effects. Yes, 10M is metric size...
  9. Eng_Struct

    Replacing Portion of Slab-On-Grade of Pre-Fab Metal Frame Building

    The hairpins are 10 ft long on both side of the pier projecting into the existing slab 1X:2Y slope (y direction parallel to the frame). I am using the slab rebar engaged based on the failure zone below. The width of the developed failure zone with developed slab rebar comes out to be equal to...
  10. Eng_Struct

    Replacing Portion of Slab-On-Grade of Pre-Fab Metal Frame Building

    Hi everyone, We're working on a project involving partial slab replacement in a pre-engineered metal building constructed in 1998. The existing 5" thick slab-on-grade (reinforced with wire mesh) includes hairpins from column piers for lateral thrust resistance. Although there is debate on...
  11. Eng_Struct

    Rail Offset On Crane Runway Girders

    The crane insaller and crane rail installer at the same entitiy. I have a 304mm wide flange with the depth between base of channel flanges 308. So there is not much room for cap channel to beam missalignment. Now I am thinking that the mistake could be due to the sweep in the member. I don't...
  12. Eng_Struct

    Rail Offset On Crane Runway Girders

    That would have been help. In my case, the are using hook bolts to install the rail.
  13. Eng_Struct

    Rail Offset On Crane Runway Girders

    Note that the rails are installed in a straight line - the the runway girders that are off. Sounds like being outside the allowable limits even by 4mm will be determental.
  14. Eng_Struct

    Rail Offset On Crane Runway Girders

    Hi Group, For one of my project, the contractor did not install the crane runway girders within the tolerence. The rails for crane are now at roughly 5/8" (15.9mm) offset from the centre of the web of the runway girder. Runway girder is wide flange beam with cap channel and has the web...
  15. Eng_Struct

    Foundation Requirement for 40m High & 2.5m diameter stack

    The stack is flue gas stack and will be made of steel. The foundation will be concrete. Thank you for the help!
  16. Eng_Struct

    Foundation Requirement for 40m High & 2.5m diameter stack

    Thanks @BridgeSmith! Good point - I will run numbers to see if I can come up with a practical pile cap size that will result in smaller uplift loading. For the single caisson suggestion, is a caisson of 2.5m to 3m in diameter even feasible? This will require a steel casing to be driven into the...
  17. Eng_Struct

    Foundation Requirement for 40m High & 2.5m diameter stack

    I am not involved in the design of the stack. Sounds like I will need to request base reactions for the stack from the designer/manufacturer. How will the temperatures/thermal effect impact the foundation? Are you referring the the base ring of the stack expanding and contracting? If so, I can...
  18. Eng_Struct

    Foundation Requirement for 40m High & 2.5m diameter stack

    Hi Group, I am looking for foundation design guidance for a 40m tall and 2.5m in diameter stack for an industrial building. The native soil is 3m below the finished grade and will mos likely require a deep foundation solution. What are the design considerations i.e., seismic and wind lateral...
  19. Eng_Struct

    Bent Anchor Bolts With Column & Framing Installed

    Hi Group, For one of our project, contractor had installed the column and framing on levelling plate and nut with column bases ungrouted. Before the GC had a chance to go and grout all column bases, the steel contractor used cables for temporary supports that were tied to column base at a few...
  20. Eng_Struct

    Column Base Plate Anchor Bolts

    Hi Group, I had a column with a 10"x10"x1/2" base plate with 2-3/4" sitting on 1.5" grout for a project. The contractor somehow did not get the top of footing and anchor bolt location correct. The underside of the baseplate is 3.5" from top of pier. They ended up slotting existing holes to fit...

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