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  1. milkshakelake

    Stepped excavation - forces on soldier pile

    I have a stepped excavation where I'm using a raker on an existing wall. About 3' inboard, I'll have a soldier pile to do the next step of the excavation. I'm wondering how to do the forces on the lower step. Is my concept correct? I'm basically using the resultant at the bottom of the...
  2. milkshakelake

    Monitoring of 24 story building

    What do I need for monitoring a 24 story building? I generally monitor 4-8 story buildings with vibration monitoring, optical monitoring, and crack gauges. Is there something different for tall buildings? Is continuous optical monitoring (robotic) needed, or 1-2 times a week in-person is fine? I...
  3. milkshakelake

    Soldier pile and lagging next to adjacent building

    I need to retain about 16'-5" of soil close to a house. Diagram below. I specified a tangent wall to prevent soil loss, but I'm getting hammered by the owner and GC that it's too expensive. Is it possible to use a raker/waler supported soldier pile wall in this case? I'm mainly concerned about...
  4. milkshakelake

    Overstrength factor for hat truss?

    Do I need to consider hat truss with overstrength factor? Sketch below. This one is a vierendeel truss. I'm not sure what to make of it, if it creates soft story/vertical irregularity or not. I'm inclined to think that it doesn't, because the stiffness of the lateral system is a collective unit...
  5. milkshakelake

    Seismic drift - moment of inertia to use for shear walls?

    Seismic drift is limited to 0.020 in a building I'm designing with Seismic Design Category B. I'm using 0.35Ig for cracked walls and 0.7Ig for uncracked walls. Can I increase the moment of inertia by 1.4 as noted in ACI 318? I kind of know the answer already, but I'm just double checking...
  6. milkshakelake

    Soldier pile retaining wall deflection

    Is there a code reference for allowable deflection in a soldier pile retaining wall? It's about 13' tall with 3x8 lagging, holding back sands. The use of the retained soil is sidewalk and backyard. I'm currently calculating 3" to 5" (depending on the steel size), and it seems high to me. But I...
  7. milkshakelake

    Number of optical monitoring targets

    Is there a reference for how many optical monitoring targets are needed on a building? This isn't for a specific case, just general. But an example would be if I'm drilling soldier piles (that cause vibration) next to a 4 story building owned by a neighbor, so I need to know how many targets to...
  8. milkshakelake

    Cold-formed steel column platform framing detail

    Anyone have a detail for how to connect a cold-formed steel beam (like a box beam) to a cold-formed steel column within a stud wall? I'd like to do this with platform framing, i.e. not a continuous column. I've shown the detail I've been working out below. It's in progress so it's missing some...
  9. milkshakelake

    Lateral concerns for making an opening in a house

    Client wants to make an opening in an existing rear wood wall. This wall is about 100 years old and definitely wasn't designed as a shear wall, but functionally, it's a shear wall. When it comes to ASCE 7 code, alterations/removals to shear walls will require shear walls added somewhere else...
  10. milkshakelake

    Rebar 90 degrees hook length

    Question: Why do some engineers use significantly longer 90 degrees hook lengths than is required by ACI code? For example, having the leg be 24" long for #5 bar, when only 10" is needed. Background: Per ACI 318-14, So #5 needs 10". This is also shown in CRSI manual. However, I've seen...
  11. milkshakelake

    Material specification of round soldier piles

    How do you specify the material of round soldier piles? I'm speaking to a soldier pile supplier. They explained: 1. Prime Pipe is made using API 5CT specification, which has strict mechanical and chemical properties. 2. Some stuff isn't good enough for that. This is called Mill Secondary...
  12. milkshakelake

    Post-installed transverse ties in foundation wall

    Is it possible to post-install column ties in a foundation wall? I have a foundation wall that was installed without transverse ties, but it has a concrete column on top of it with about ultimate 450 kips axial load. Per ACI 318-14, ties are required:
  13. milkshakelake

    Is Risa-3D good for wood building design?

    I have some relatively small 2 to 3 story wood buildings I need to design. Is Risa 3D good for this? I need to calculate joists, studs, jambs, headers, and beams. I'm downloading their trial right now, but I'm wondering if anyone has long term experience with this software. I currently design...
  14. milkshakelake

    Shim between steel beam and wood joists

    I'm adding a steel beam under the 2/3rd span of existing joists, since the joists fail without the beam. These are my details below. The issue: the joists are not level, so some of them need shims. How do I install these shims? I'm mostly worried about nailing between the joist, shim, and sill...
  15. milkshakelake

    Moment connection between wide flange and channels

    Does this work? I'm not 100% sure how the unbraced length would work; maybe each channel is fully unbraced, which would make it very hard to work with.
  16. milkshakelake

    Lateral requirements for shrinking a building

    I have a 100' long building that's being shrunken down to 60' due to zoning issues. Generally when I extend a building, I know that ASCE 7 requirements must be met for the entire building for 10% or more addition. But if I shrink it, does that still apply? The goal is to keep the existing front...
  17. milkshakelake

    Dealing with stress during tough weeks

    I have a million projects due this week, I'm understaffed, and I can't finish everything. Clients are calling all the time with problems on site or asking for drawings. Is it possible to maintain peace while being like this? For context, it's not always like this. Usually, I can send everything...
  18. milkshakelake

    CMU "moment frame"

    I'm designing a CMU wall as a moment frame. It's an existing 8" reinforced CMU wall (with 4" brick face) that needs to be upgraded for lateral. I'm going to replace some of the horizontal "CMU beams" with concrete beams. Anyway, do I need to check diagonal shear around the window openings? And...
  19. milkshakelake

    Photogrammetry of interiors

    I'm looking for an alternative to Matterport. It's a 3D photography solution that allows measurements and walking around. It has been tremendously useful on a few projects for structural inspections (I didn't do it myself, it was provided by clients). My issue with Matterport is that it's...
  20. milkshakelake

    Concrete flat slab support near opening

    I'd love to get a second opinion on the flat slab layout shown below. I think it's okay personally. The load path seems okay. I'm only concerned about the area shown with markups.

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