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  1. MikeW7

    Miami Pedestrian Bridge, Part XIV

    NOTE: I'm using my YouTube video below because it doesn't add any interpolated frames - it's "slowed down" by adding multiple copies of each frame. The truck dash-cam video clearly shows 12 starting to dropping behind the pier at about the 11 second mark when the deck hinge has fallen about 1/3...
  2. MikeW7

    Miami Pedestrian Bridge, Part XIV

    Refer to my "cut-and-paste mashup" in Part 12 - MikeW7 (Electrical) 22 Jul 19 03:24. It's crude, but the sequence of events seems to follow what was observed in the truck dash-cam video. Image 2 assumes the 11-12-canopy triangle remained relatively intact after the hinging began, in which case...
  3. MikeW7

    Miami Pedestrian Bridge, Part XIV

    May 15 - Tony Pipitone (NBC6 Miami) discusses recent IG report from FHWA May 12 - U.S. Department of Transportation, Office of Inspector General - FHWA Report No. ST2020035
  4. MikeW7

    Miami Pedestrian Bridge, Part XIV

    Newton's Laws of Motion were actually replaced in 1915 by Einstein's relativity theories (1905 & 1915) but they're still "good enough" for everyday engineering. Was doing some reading about Scientic Laws and came across these nuggets: So the definition of a scientific law kinda sounds a lot...
  5. MikeW7

    Miami Pedestrian Bridge, Part XII

    NTSB News Release:
  6. MikeW7

    Miami Pedestrian Bridge, Part XII

    But he's mentioned on page 27 of the OSHA report. Doesn't that make him a recognized expert? [upsidedown] P.S. - According to his YouTube "About" he is being harrassed and stalked by Eng-Tips, so be careful.
  7. MikeW7

    Miami Pedestrian Bridge, Part XII

    This guy might also be in the top ten: https://www.youtube.com/user/etiennekai/playlists
  8. MikeW7

    Miami Pedestrian Bridge, Part XII

    I think everybody is taking a break before the NTSB report comes out. The only recent news is a Tony Pipitone report about the creative book keeping used in MCM's bankruptcy.
  9. MikeW7

    Miami Pedestrian Bridge, Part XII

    The idea that FDOT was hesitant for any reason is pretty suspicious, because they have apparently have a reputation for heavy handed bid-rigging in the Miami area. Side note on this June, 2017 article - the favored bid by Fluor-Astaldi-MCM that FDOT screwed over was a design by .......... FIGG.
  10. MikeW7

    Miami Pedestrian Bridge, Part XII

    According to the OSHA report, page 14, the selection committee was made up of FIU officials, the City of Sweetwater, and FDOT. TY Lin, which prepared the design criteria, wasn't a part of the selection committee. Is is normal practice to not include someone with technical expertise?
  11. MikeW7

    Miami Pedestrian Bridge, Part XII

    Just upload it as a PDF file and no one should have any issues with it. Even if it's hand-written, you can scan it with a "save-to-pdf" option.
  12. MikeW7

    Miami Pedestrian Bridge, Part XII

    Lots of hyperbole in the video - here's a list of many, many more videos. The RANGE of years figured in the 240 year average is something like 200-900 years, so the futurecast for an earthquake is "more likely" not ASAP. As more and more people are educated about the risks, the PNW has been...
  13. MikeW7

    Miami Pedestrian Bridge, Part XII

    While looking for images taken immediately after the collapse I noted that only 3 people are responsible for most of them: All chopper pictures were by Pedro Portal Ground images were taken by Joe Skipper and Wilfredo Lee If you're still looking for good pictures, search for those names...
  14. MikeW7

    Miami Pedestrian Bridge, Part XII

    epoxybot (Structural) 24 Jul 19 20:53 - Now I understand why the "falling man" had his safety harness clipped to the crane hook.... Have a gander at the "safety line" these guys were using: A nylon sling cinched around rebar through its own end loop A light-weight pulley clipped to the other...
  15. MikeW7

    Miami Pedestrian Bridge, Part XII

    Spartan5 (Civil/Environmental) 23 Jul 19 13:10 Cool! Free toys AND a slick marketing ploy to sell Canon printer ink by the gallon. What I seem to remember are puzzles printed on thick paper, bound into a magazine. I also remember buying the whole series of The Incredible Machines games back in...
  16. MikeW7

    Miami Pedestrian Bridge, Part XII

    I started re-learning a CAD program I was once very familiar with, and also working out a table of dimensions, but gave up because other things in my life have a higher priority. CAD (cardboard-assisted design) seems to be very popular with the YouTube kids nowadays (see Project Binky and Acorns...
  17. MikeW7

    Miami Pedestrian Bridge, Part XII

    In the chopper photo posted by Tomfh (Structural) 9 Jul 19 22:19 there appears to be a considerable amount of rubble immediately north of the pier, but no large chunks. Can't really identify the large object hidden in the manlift shadow (between the canal wall and the red beam). Anybody know if...
  18. MikeW7

    Miami Pedestrian Bridge, Part XII

    I seem to remember that the canopy-11-12 triangle was one of the initial theories about the likely failure of the 11-12-deck joint. I reworded the captions so the second picture describes this theory as an IF scenario.
  19. MikeW7

    Miami Pedestrian Bridge, Part XII

    New cut-and-paste mashup. Now in Color! (Old mashup posted 11 Jul 19 20:46) [highlight #FCE94F]EDIT ADD: Not a structural guy! I made this diagram to visualize the spatial relationship of the components based on how they seem to appear in videos. I will adjust the captions based on group...
  20. MikeW7

    Miami Pedestrian Bridge, Part XII

    The Barnhart Movement Plan (Sheet LLT-01) says the following BDI instruments were used: STRAIN TRANSDUCER BDI ST350 ROTATION SENSOR BDI T500-030 DISPLACEMENT SENSOR BDI STRING POT Here's the link to the BDI sensor page. The page for each instrument includes PDFs for a Spec Sheet and...

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