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Recent content by Engineerataltitude

  1. Engineerataltitude

    retrofitting new opening into an existing CMU exterior bearing/shear wall?

    Per ASCE 12.2.3, I was going to model the entire shear wall line in RISA 2D with the two systems (existing ordinary reinforced masonry shear/bearing walls + new SS OMF's in two bays) using the most limiting R value (R=2 for the CMU walls) for loading. The OMF member sizes will most likely be...
  2. Engineerataltitude

    retrofitting new opening into an existing CMU exterior bearing/shear wall?

    Thank you for the response. I just got an updated Reinforced Masonry Engineering Handbook from the MIA and it's corresponding Solutions Manual. Those should help. I told both prospective clients that their projects would have to be modeled with RISA-2D to do the relative stiffness analysis in...
  3. Engineerataltitude

    good reference for alterations of existing reinf. CMU walls?

    Thank you for the response. Both the buildings in question were built in the late 1960's. They both look in great condition, but seismicity was not a big design consideration back then. Definitely did not have all the technicality of ASCE 7-16 Ch 12 to deal with back then (i.e. seismic...
  4. Engineerataltitude

    retrofitting new opening into an existing CMU exterior bearing/shear wall?

    Looking for a reference for retrofitting openings into an existing CMU bearing/shear wall. Most of my structural work has been with wood framed construction in CA. High snow load and seismic country. In my area of practice seismic loads in buildings are huge always govern the lateral design...
  5. Engineerataltitude

    good reference for alterations of existing reinf. CMU walls?

    Looking for a reference for retrofitting openings into an existing CMU bearing/shear wall. Most of my structural work has been with wood framed construction in CA. High snow load and seismic country. In my area of practice seismic loads in buildings are huge always govern the lateral design...
  6. Engineerataltitude

    wonky code question about applicability of seismic overstrength factor for retrofit holddowns in residential wood frame shear wall?

    in the 2022 CBC Sec 1905.1.8 ACI 318 Section 17.2.3, section 17.10.5.3 (d) requires the seismic overstrength factor for wood framed shear walls, 3.0, to be applied to the net uplift load at wood framed shear wall ends. When combined with all the ACI limitations on concrete breakout and...
  7. Engineerataltitude

    pre-qualified beam-to-column corner connection "calculations" in structural steel OMF?

    It's been a few years since I've had the occasion to design an OMF in a custom home in CA, but just got one recently. In the past, I've used a prequalified, WUF-B beam-to-column connection. I used to call that a "prequalified" connection, but maybe that isn't the correct terminology anymore...
  8. Engineerataltitude

    where can I find the commentary for the 2022 CA Existing Building Code?

    This feels like a stupid question but does anyone know where to find the Commentary for the CA Existing Building Code? I've been searching around on the web but nothing is coming up. Only thing I can find is the Commentary for the 2021 IEBC. Is that all there is? I am having a dispute with a...
  9. Engineerataltitude

    Simpson Titen HD in holes drilled through bottom plate into concrete about 20 degrees off vertical?

    Current angled holes meet all minimum edge and end distances for both sills and concrete. This is a retrofit of an old building to a foundation that had no anchorage to the concrete at all. Holes are drilled about 4 1/2" into the concrete (specs call for 4"min embedment) Extra labor would be...
  10. Engineerataltitude

    Simpson Titen HD in holes drilled through bottom plate into concrete about 20 degrees off vertical?

    Tried Simpson already. They had no guidance on it. There are about 55 holes drilled this way. Lots of labor to correct, so seemed worthwhile to try to find a resource to buy it as-is. My gut feel is that it is OK. I just need to present an engineering rationale for that. Shear seem...
  11. Engineerataltitude

    Simpson Titen HD in holes drilled through bottom plate into concrete about 20 degrees off vertical?

    A builder drilled holes for 5/8" Simpson Titen-HD's to be retrofit into an existing concrete footing about 20 degrees off vertical because of some as-built constraints in the building. Off vertical to the outside, not length-wise to the sill. The building inspector caught this and said he had...
  12. Engineerataltitude

    best software for designing an elevated residential garage slab?

    The project is still in design, so client doesn't have a GC yet. It is on the east side of the Sierra, about 250 miles from So Cal sources for pre-cast products. Maybe Reno or Las Vegas could be options. Transporation costs for precast hollowcore planks might be daunting. Especially for a...
  13. Engineerataltitude

    best software for designing an elevated residential garage slab?

    Did a google search for hollowcore planks and there are many brands. I'm in CA, can anyone recommend a quality brand in this area?
  14. Engineerataltitude

    best software for designing an elevated residential garage slab?

    Excellent guidance. Very appreciated.
  15. Engineerataltitude

    best software for designing an elevated residential garage slab?

    Most of my 30+ yr practice a has been residential and low rise commercial and light industrial. The only elevated garage slabs over conditioned space I've done over the years have been single car garages. I now have a big luxury home with a 24ft x 24 ft elevated garage over conditioned space...
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