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  1. bbartlet

    Shear Transfer in Acoustic Deck

    I honestly can’t say about the project that it was noticed on. But regardless of any current project, this is a question about future projects as much as any. Acoustic deck is often used over rooms larger than 12’x12’ (e.g. - gymnasiums, choir rooms, etc.) where the deck is also counted on for...
  2. bbartlet

    Shear Transfer in Acoustic Deck

    In a typical metal deck diaphragm, the ends of each deck sheet are overlapped over a supporting member to create deck/diaphragm continuity. When acoustic deck is used, the perforated sheet on the underside of the deck makes it impossible to overlap the deck, so sheets are simply butted...
  3. bbartlet

    Placement of Anchor Bolts

    I appreciate everyone's responses. We do have notes that cover this in our spec but the contractor is balking a little bit and says that what he is doing is "standard practice". He wanted to know if he could still "wet stick" and use a vibrator to consolidate, but I told him I didn't believe...
  4. bbartlet

    Placement of Anchor Bolts

    I have a project where the contractor has been "floating" or "wet sticking" anchor bolts and wall dowel bars into the top of a concrete foundation. I know that ACI 7.5.1 does not allow this for dowel bars, but I have not been able to find anything regarding requirements for placing anchor bolts.
  5. bbartlet

    Beam Design in Chevron Braced Frame

    We are in SDC A. We do not typically have to detail for seismic. My question is whether or not it is acceptable to design the chevron braces to also support the floor beam. I thought I had read that beams need to be designed to span the full length of the frame (in case the braces fail) but I...
  6. bbartlet

    Beam Design in Chevron Braced Frame

    I am designing a two story ordinary braced frame in Iowa, that is governed by wind load. I remember seeing something about needing to design the beams in a chevron braced frame to be able to support their trib loads without using the chevron braces as a support point (effectively cutting the...
  7. bbartlet

    PEMB Foundation with Expansive Soils

    I am designing foundations for a PEMB. The issue that we're running into, is that the geotechnical report indicates there are potentially expansive clays under the slab and that the slab be separated from the foundations. This is typical for most traditional buildings that we have done in the...
  8. bbartlet

    Expansion Joint Depth

    I appreciate everyone's advice. We are leaning towards taking the joint down through the basement walls to the foundations due to the fact that these walls are partially exposed. However, we're still early in design and grading is such that we could probably eliminate exposure, or at the very...
  9. bbartlet

    Expansion Joint Depth

    I am designing a 3-story, L-shaped, CMU building with hollowcore floors. The building also has a CIP basement. The grade varies along the exterior of the building so that the basement walls are partially exposed (roughly 3' to 4' maximum) in some areas. The building is essentially two 58'-0"...
  10. bbartlet

    Diaphragm Connection With Joists

    We have used HSS blocking in between joists for years. We've used this on both frames and above CMU shearwalls. In cases where the joists have a high slope, the bearing seat can sometimes require more than the typical 2 1/2" (see SJI's spec) so we've shown details with a larger tube and noted...
  11. bbartlet

    Post Installed Epoxy Coated Rebar

    I have e-mailed Hilti, but haven't gotten a response back. From the summary of the article provided in the link by bones206, it appears that creep was the only area in which there were certain products that didn't qualify. This will not be a tensile application so I think it should be fine...
  12. bbartlet

    Post Installed Epoxy Coated Rebar

    I am designing a exterior concrete basment stair that has epxy coated rebar but would also like to use epoxy adhesive to drill/epoxy the bars into the face of the supporting wall. Are there any issues or strength reduction with using epoxy adhesive on epoxy coated rebar? It is mainly a shear...
  13. bbartlet

    Steel Arching?

    I had the model segmented into 15 sections. I thought that it was just going into bending, but I think the straps are just grossly inadequate and are failing. I got the model to work and give me compression reactions at the ends. But now I'm getting an error message that "p-delta is...
  14. bbartlet

    Steel Arching?

    Both ends are pinned, and it's most likely not working because it's a shallow radius, and it's slightly angled. This was sort of a last ditch effort and may be grasping at straws, but I thought I should at least test it. Does anyone know of any formulas that I could do a hand calc with?
  15. bbartlet

    Steel Arching?

    I forgot to mention that I've tried making a model of it in RISA 3D, but it simply goes into bending and doesn't appear to get any arching action. Which is really my only hope that this structure might pass.
  16. bbartlet

    Steel Arching?

    Does anyone know where I could find information on the design of a single member arch? We designed intermediate support for a fabric awning on an outdoor canopy structure with tubes at roughly 2' o.c. bent to a 10' radius. During construction flat steel straps which were bent to radius were...
  17. bbartlet

    In-floor radiant heating in topping slab

    There is no foam insulation. I am not exactly familiar with the installation procedure for the infloor piping, but we could see the tubing being installed directly on top of the precast and the topping poured over it. If this is the case, would the bonding be impaired even with the standard...
  18. bbartlet

    In-floor radiant heating in topping slab

    We are designing a dorm with 8" precast slabs and the mechanical engineers want to use in-floor radiant heating in the topping slab. Does anyone have any experience with this or know where I could find any information on whether or not the topping slab can still be considered a composite...
  19. bbartlet

    Foundation Pour Lengths

    Thanks, I appreciate the help.
  20. bbartlet

    Foundation Pour Lengths

    The project is multiple buildings, so some are earth formed trench footings, and others are formed footings with stem walls. All will be buried foundations so they're not retaining soil and aren't under any flexural stresses. Which part do you feel is too strict? The length or the delay in...

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