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  1. spsalso

    SF Tower settlement Part IV

    There have been weekly reports on settlement of this building: https://www.sf.gov/resource/2022/monitoring-reports-about-millennium-tower-retrofit The latest one is dated July 29, 2024. I wonder at the length of the latest "week". spsalso
  2. spsalso

    Quench hardening brass?

    It's my belief that one cannot quench harden brass. I've just run into someone who insists it can be done. He says he's done it. "And my Professor of Metallurgy at Stevens even mentioned it in class when we were discussing brass vs. bronze." Can someone come up with some documentation for...
  3. spsalso

    Federal court rules engineer CAN talk about engineering failures

    In case you were worried you might get in trouble for stating your engineering opinions: https://www.youtube.com/watch?v=mnSjDIj3OTg spsalso
  4. spsalso

    Some thoughts on project management (FIU bridge in particular)

    I found many good points in this video examining the causes of the bridge failure--the "whys", not the "whats". https://www.youtube.com/watch?v=YKiyb8S-Dq0 spsalso
  5. spsalso

    Fire shuts down I10 in LA

    A fire under the freeway: https://www.youtube.com/watch?v=R53bBD9TbxQ A visual visit to that area using Google Maps shows an enormous amount of flammables placed under the freeway, including wood, tires, and vehicles. It's been my impression that California DOT did not allow that sort of...
  6. spsalso

    Cause of Joplin Empire Builder crash of September 25, 2021

    Here is the NTSB report on this crash: https://www.ntsb.gov/investigations/AccidentReports/Reports/RIR2308.pdf Inadequate track inspection/maintenance. spsalso
  7. spsalso

    Report on Evergiven at the Suez Canal

    Here's a new post by Sal Mercogliano discussing the analysis of the grounding of this ship in the Suez Canal: https://www.youtube.com/watch?v=UfchAELXsVI spsalso
  8. spsalso

    Railroad turntable support

    Railroad turntables support track that can be spun around to align with various radial trackage. At first, they had only a center bearing. This meant that the locomotives had to be perfectly balanced before the turntable was turned (much like a swing bridge). Fairly quickly, a ring rail was...
  9. spsalso

    High rise window fail in San Francisco storm

    Interesting that the glass itself failed, rather than the mounting: https://abc7news.com/storm-shelter-in-place-order-california-street-falling-glass/12953868/ spsalso
  10. spsalso

    Train crash in Ohio

    https://www.cbsnews.com/news/ohio-train-derailment-causes-big-fire-evacuations/ Note the mention of extremely low temperatures. I suspect that is the cause*. And I suspect the train crew should have been told to operate at restricted speed, because of that possibility. And/or the trackage...
  11. spsalso

    US Navy litoral combat ships having engineering failures

    The Independence class can only go at high speeds on a nice day: https://www.navytimes.com/news/your-navy/2022/05/10/the-littoral-combat-ships-latest-problem-class-wide-structural-defects-leading-to-hull-cracks/ The Freedom class is being scrapped. And it's not because they're old and worn...
  12. spsalso

    Another interesting bridge

    We've talked about the railroad bridge over Highway 101 at Ventura CA, and the addition of unnecessary steelwork thereon. Here's another one, but I doubt there's anything unnecessary. In fact, it visually feels like something is missing. The bridge is at Cuttingsville, Vermont. Here's an...
  13. spsalso

    An unusual feature (to me) on a steel truss bridge

    Below is a link to a photo of a railroad bridge (build date 1961) over Highway 101 in Ventura CA: https://c1.staticflickr.com/3/2600/3924736355_282e9c38fb_b.jpg I see that as being a two-span truss bridge. I am wondering about the reason for the horizontal member along the top, immediately...
  14. spsalso

    "Instant" railroad bridge in WWII

    I recently received a publication that shows a photo of what is likely a jiffy-quick railroad bridge/trestle, built by the US Army somewhere in Europe during WWII. Here should be a link to the publication. The photo is on page 20: Link The two locomotives are American made for the...

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