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Thread: What would cause a building to shake?

  1. #1
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    What would cause a building to shake?

    So a skyscraper in China starts shaking for no apparent reason. Anyone have any ideas what would cause it?

    Thousands of shoppers in the southern Chinese city of Shenzhen fled the vicinity of a 957-foot (291-meter) skyscraper Tuesday, after it inexplicably began swaying.



    Follow the link for the story.

    https://www.msn.com/en-ca/news/world...1gTeke?ocid=sf


  2. #2
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    Seems like a combination of factors likely due to not having a mass dampening system installed: https://www.theguardian.com/world/20...eather-reports

    Interestingly, the wobbling movement was vertical rather than lateral.

  3. #3
    With a building that tall and narrow, it could be related to vortex shedding. Maybe harmonics too. Usually the designers test scale models of the design in a wind tunnel to identify the issues. Very interesting area of structural engineering.

    See here:


    Last edited by Edwin Santos; 05-28-2021 at 10:50 AM.

  4. #4
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    i would guess some kind of harmonic issue as well. interesting. also, china builds these things as fast as possible with little regard to proper engineering.

  5. #5
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    I worked at a engineering firm that did wind tunnel testing on tall buildings, i built the models that were tested in the wind tunnel. We built scale models out of Balsa wood and printed plastic models which we installed hundreds of tiny tubes that were connected to sensor to measure wind pressure at various places. We also built a scale model of the surrounding city scape to place the new design in, The whole setup was placed in the wind tunnel and tested.

    The reports on this building have said that there was no wind issue. They said that there was only a slight breeze. It will be interesting to see what the attribute the cause to.


    Quote Originally Posted by Edwin Santos View Post
    With a building that tall and narrow, it could be related to vortex shedding. Maybe harmonics too. Usually the designers test scale models of the design in a wind tunnel to identify the issues. Very interesting area of structural engineering.

    See here:



  6. #6
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    Shenzhen is a new city with a lot of skyscrapers.

    http___cdn.cnn.com_cnnnext_dam_assets_170717144749-ping-an-finance-centre[1].jpg

    https://www.cnn.com/style/article/sh...per/index.html

    https://shenzhenshopper.com/2731-fut...yscrapers.html




    Quote Originally Posted by Adam Herman View Post
    i would guess some kind of harmonic issue as well. interesting. also, china builds these things as fast as possible with little regard to proper engineering.

  7. #7
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    +1 on the wind harmonics, the Tacoma Narrows bridge was brought down by 40 mph winds in 1940.https://en.wikipedia.org/wiki/Tacoma..._Bridge_(1940)

  8. #8
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    The building has been there for 21 years.!

  9. #9
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    In 21 years other tall buildings have gone up and disrupted airflow around the older one.
    Bill D

  10. #10
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    I think it’s payback from Mother Nature for blaming the corona virus on her.
    Everyone know it was gain of function research.
    Aj

  11. #11
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    Quote Originally Posted by Mark Hennebury View Post
    The reports on this building have said that there was no wind issue. They said that there was only a slight breeze. It will be interesting to see what the attribute the cause to.

    Too many wild parties at one time.

    New round of nuclear testing.

    Tiny black hole hit the earth.

    High school prank: "Ok, on the signal we all run to the other side of the building then run back."

    A record number of cicadas coming out of the ground.

    Elon Musk drilling another underground tunnel.

    Space aliens approaching. Video at 6.

  12. #12
    The tremor might just exist in the hands of the camera people. “Camera- rowdyree”

  13. #13
    likely too many Yutes inside dancing all at once making Tik Tok videos

  14. #14
    so I've read above China builds 'as fast as possible with little regard to proper engineering', and 'the wobbling movement was vertical rather than lateral'...

    So, hasn't anyone else's house 'settled'?
    DSC09231 (Small).JPGDSC09234 (Small).JPG
    -notice the 2"+ rock under the back wheel of the BBQ to level it?

    Lax engineering in the foundation deptartment and vertical wobbling, both are signs the thing's just moving farther down into the ground a bit...
    ========================================
    ELEVEN - rotary cutter tool machines
    FOUR - CO2 lasers
    THREE- make that FOUR now - fiber lasers
    ONE - vinyl cutter
    CASmate, Corel, Gravostyle


  15. #15
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    Street traffic could account for the shaking

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