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  1. old jim

    Miami Pedestrian Bridge, Part V

    Thanks guys for the better videos the clarity of this one linked by Gwideman and MikeW7 is a comfort to me. Looks as if it's close to the source. Even shows the reflection of his coffee mug in the windshield... https://www.youtube.com/watch?v=jzbfJF5iVpI Even shows the "Mystery Projectile"...
  2. old jim

    Miami Pedestrian Bridge, Part V

    sure seems plausible . At the instant of that frame you posted, the tendon hadn't yet unzippered from #11 . As the deck continued down with #11's bottom hung atop pylon, it ripped the tendon out straightening rebar as seen in NTSB pictures ? Holding that thought to see if it...
  3. old jim

    Miami Pedestrian Bridge, Part V

    Wow - that one sure makes the mysterious 'bulge' or 'puff' look more like a definite breakout. That link Dilbert gave points to DailyMail , which appears to be a copy of a youtube by one 'officialjoelf' Here's the youtube "officialjoelf" version which is clearer yet. I wonder were he got...
  4. old jim

    Miami Pedestrian Bridge, Part V

    Belated thanks @ Saikee119 for explaining .. old jim Never trust a computer with anything important...
  5. old jim

    Miami Pedestrian Bridge, Part V

    One last question from this beginner ? just thinking aloud because i'm not qualified to assert anything about concrete. Happy to see questioning the sequence of tensioning. Tensioning the deck and canopy separately i would think changes their relative lengths by elastic compression . That...
  6. old jim

    Miami Pedestrian Bridge, Part IV

    I've been having a difficult time letting go of that image of #11's lower tensioning rod protruding out the top with jack still attached. I thought surely it'd snapped as suggested by the Youtube "Smoking Gun" guy but finally realized that is likely a red herring. Ingenuity's image above...
  7. old jim

    Miami Pedestrian Bridge, Part IV

    Noob question from a non-Civil engineer... (non-Civil discipline as opposed to un-Civil demeanor) IF a tendon snapped, say that one with jack attached that's protruding from the blister; THEN would an impulse result as the member elastically expands upon sudden reduction in compressive force...
  8. old jim

    Miami Pedestrian Bridge, Part IV

    Looks like the dashcam vehicle was slowed to a crawl. The viewing angle didn't change enough in the 0.16 seconds to create that illusion. Even at 10mph, 0.16 sec is just 2 ft 4 inches. old jim
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