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  1. ggcdn

    Slideruleera.net Successor

    No, its not a replacement for SRE, just another convenient link to those references. Anything goes on the internet, so I wouldn't consider it toe stepping.
  2. ggcdn

    Slideruleera.net Successor

    Hey there, I run calcs.app. I'm not actually hosting the files, but rather linking to the ones I could find. If there are missing ones that you know of, please let me know! In the past discussion there was some interest in compiling all the PDFs from SRE into a zip that we could store in a few...
  3. ggcdn

    NBCC 2020 Climatic Data

    Not exactly what you're looking for, but if you provide the values I can add them to my db here: https://calcs.app/general/seismic-and-climate-data
  4. ggcdn

    SE Exam New format April 2024

    I wrote and passed the CBT lateral and vertical breadth exams several weeks ago. Since the exam format was new I decided to 'wing it' without putting in much studying effort, just worked on practice problems leading up to the exam, and got lucky. I had previously written the CBT California...
  5. ggcdn

    General Discussion on Skyscraper Drift

    In the 'medium-tall' design space (45-60 stories) wind design basically amounts to making the LFRS stiff enough to limit drifts (H/500 for instance), strong enough for the equivalent static loads, and then limiting accelerations to levels deemed acceptable for the occupancy. This is usually done...
  6. ggcdn

    BC, Canada, Code changes to Boost Highrise Construction

    I cant help but feel all the exuberance around mass timber high-rises is premature. Not my specialty, but from what I understand, its basically the wild west out there with regards to things like connection detailing. Are we setting ourselves up for a Northridge-style lesson to be learned?
  7. ggcdn

    ETABS Earthquake Core wall Transferring causing very unexpected shear distribution

    You really need to be modelling the L1 and ground floor slabs out of plane behavior, including all gravity columns. There isn't a complete load path without them, and more importantly, the stiffness of the discontinuous walls is not correctly captured. Garbage in, garbage out. You should...
  8. ggcdn

    Transfer of Canadian P.eng license to US P.E process

    For California, I had to write the FE, PE, Seismic, Surveying, and Ethics exams. They didn't seem to care about a P.Eng other then it counting for something on work experience. The FE and PE could be done immediately through NCEES. Then you submit an application to the board, which includes...
  9. ggcdn

    ASCE 7-16 12.4.2.2: Vertical Seismic Exception - Mat Slab Foundation

    My understanding is that Ev can be excluded from only the ASD combinations, which you would only be using for checking soil demands. The concrete design would be using USD combinations which then need to include Ev. This can lead to a bit of inconsistency for things like checking uplift and...
  10. ggcdn

    Performance-Based Design "Philosophy"

    Josh touched on retrofit uses, but on new builds PBD in the US is largely done to get around the 240ft height limit on special concrete wall systems without having to go to a dual system. One of the side effects of that, when compared to code based design, is you generally need much more shear...
  11. ggcdn

    Is subgrade modulus still used by structural engineers?

    I use it for large combined footings / raft foundations / core footings which require analysis by FEM. I'm not sure how you could reasonably design a large raft without it. The results are quite sensitive to it on softer soils. Once you get above 200psi/in or so with typical building footings...
  12. ggcdn

    Elevator Openings In Concrete Core Walls

    I normally make the returns/ that side a nonstructural wall. It’s both designed and built as a c shape wall.
  13. ggcdn

    Elevator Openings In Concrete Core Walls

    Its common in North America to not include the returns and just design a three-sided / C-shaped wall. Usually they need the largest opening at or near the ground floor for installing the cabs.
  14. ggcdn

    Cold Joint

    MSL, We usually get asked by contractors if they can use StayForm in this situation.
  15. ggcdn

    A win for open access to building codes

    US Court of Appeals upholds that building codes and standards incorporated into US law can be freely disseminated. https://www.eff.org/press/releases/appeals-court-upholds-publicresourceorgs-right-post-public-laws-and-regulations
  16. ggcdn

    US PE License for Canadian Engineer

    Torchman, I cant speak to NY, but in CA the application for license required either a SSN or an ITIN. It did not explicitly require proof of legal authorization to work in the US, like a green card, nor does it grant such authorization. Getting the ITIN from the IRS was difficult...
  17. ggcdn

    Slide Rule Era

    FYI, I've started creating a list of historical references that were external links rather than hosted PDFs (eg, links to archive.org documents). So far I've added Building Codes and Steel Manuals. I also added a few that weren't on SRE's site, like NBC, historical state codes, etc. Some of...
  18. ggcdn

    How to do seismicX and seismicY load combinations in ETABS?

    Im confused about why different R values would need different models. An R value is just a scaling factor. For instance, you could run EQx and EQy with R=1 and then combine them in combos with appropriate factors, 1/R. Also maybe it’s a different code but are you sure you need a 45deg case...
  19. ggcdn

    Diagonal reinforcement in coupling beams

    It confines the concrete around the diagonal and prevents strength loss. It’s basically a cage to keep the beam intact. There are quite a few tests where the longitudinal bars are developed, and the beam generally performs okay, but there is much higher over strength compared to code equation...
  20. ggcdn

    NCEES Structural PE (SE) Examination - Refresher/Review Course Recommendations?

    SEAW offers a refresher course in the form of a dozen or so lectures. I found the lectures were good but it was more breadth than depth. -JA (working on [link calcs.app]Calcs.app[/url])

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