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  • Users: strucbells
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  1. strucbells

    exterior slab on grade

    Is it common practice or recommended to require a single or double polyethylene slip sheet for an exterior industrial slab on grade (no cover)? Basically a vapor retarder like for a building but the intent would be just to help reduce subgrade restraint for shrinkage and curling and help protect...
  2. strucbells

    Precast hollow core plank detailing at interior non-shear walls

    Working on a simple flat roof rectangular CMU building (80' x 32') with a hollow core plank roof, SDC D, will have 2" of topping grout to create the diaphragm. There are 2 full length interior walls at nearly the third points running perpendicular to the long direction and I would like to make...
  3. strucbells

    High out of plane seismic wall anchorage to wood roof

    Designing a small CMU building with a wood framed roof in a very high seismic area. Sds = 1.68g, Ie = 1.5. This is an essential pump station facility, hence the higher importance factor. Using 8" fully grouted CMU, the out of plane wall anchorage force is really high, around 1.25*Wp. Typically...
  4. strucbells

    CMU/Conc Vertical Wall Joint

    I am designing a 1 story CMU water treatment building that has partial height cast in place concrete basin walls that form part of the exterior wall. See attached rough sketch. I am planning to provide masonry control joints as shown in the attachment. At the vertical joint between cast in...
  5. strucbells

    Concrete wall to mat slab joint design

    Paging JedClampett..not sure if there's a way to message users directly here. I was taught at my last job to design the mat slab to wall joint for reinforced concrete liquid containing basins for the mat to have at least the same flexural capacity as the wall at the joint. This is for an open...
  6. strucbells

    Sodium Hypochlorite

    Working on prelim design of a new building that involves storing ~800 gallons of 12.5% concentration of Sodium Hypochlorite. The 2018 IBC, 2018 IFC, and NFPA 400 all do not indicate which category this chemical falls under. From reading the SDS and doing some other research, it appears to be...
  7. strucbells

    Steel lintels for CMU walls?

    What are the advantages of using steel lintels over door and window openings for masonry walled buildings? I see questions on here often about these. I mainly do industrial and water/wastewater projects and we often design small to mid size 1 story reinforced CMU pump station/etc. buildings and...
  8. strucbells

    Wood (1973) Seismic At Rest Pressures - Too Conservative?

    I'm a structural engineer who has recently gotten more involved in designing large underground structures in seismic areas. These often involve thick basement walls that are subject to at rest pressures for static soil loading provided to us by our geotechnical consultants. I've noticed that...
  9. strucbells

    Above ground Ductile Iron Pipe Seismic Response Factor

    I am a structural engineer that recently started doing some pipe support design for some wastewater treatment plant projects with above ground ductile iron piping. What is the appropriate design value for ductile iron piping under ASCE 7-16 Chapter 13 for seismic response factor (Rp)? Generally...

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