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Thread: 241 Bridge Flex

  1. #1
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    Default 241 Bridge Flex

    I shot this time laps of the overpass behind my place and in reviewing the footage I noticed the scary amount of flex on this HUGE structure WOW

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  2. #2
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    Default Re: 241 Bridge Flex

    Built in via the engineering so that it sways with one of those earth shakers they occasionally get, much like the skyscrapers in LA and SF are mounted on teflon pads and other viscous dampening systems to let them dance a little instead of "come a tumbling down."
    "Unrepentant Reprobate"
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  3. #3
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    Default Re: 241 Bridge Flex

    Yep. They're built that way for a purpose.
    I was born on a wooden boat that I built myself.

  4. #4
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    Default Re: 241 Bridge Flex

    No I figured this was designed on purpose for earthquakes. I actually always looked up at these massive structures and wondered how they would fair in a 6.2 seismic event. Now I know
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  5. #5
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    Default Re: 241 Bridge Flex

    Although designed this way, it is hard to understand how concrete and steel can flex that way.
    "Where you live in the world should not determine whether you live in the world." - Bono

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  6. #6
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    Default Re: 241 Bridge Flex

    Yup. Worry about the ones that don't have any flex.

  7. #7
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    Default Re: 241 Bridge Flex

    Better to bend than to break.
    "The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails."
    -William A. Ward



  8. #8
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    Default Re: 241 Bridge Flex

    Quote Originally Posted by Old Dryfoot View Post
    Yup. Worry about the ones that don't have any flex.
    For example, elevated I-5 through downtown Seattle.
    The Algorithm Is Watching

  9. #9
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    Default Re: 241 Bridge Flex

    That’s not flex, THIS is flex.


  10. #10
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    Default Re: 241 Bridge Flex

    Quote Originally Posted by ron ll View Post
    That’s not flex, THIS is flex.

    Not just flex, amplifying harmonic failure.
    "The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails."
    -William A. Ward



  11. #11
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    Default Re: 241 Bridge Flex

    Quote Originally Posted by CWSmith View Post
    Although designed this way, it is hard to understand how concrete and steel can flex that way.
    Well, if they are prestressed concrete the steel reinforcing is under tension so that the concrete is under compression. Then as it flexes the steel although stretching always has enough tension wound in to keep the concrete under compression, and if it flexes the other way the steel relaxes a bit, but the concrete is always within its compressive strength limit.
    It really is quite difficult to build an ugly wooden boat.

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  12. #12
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    Default Re: 241 Bridge Flex

    The Golden Gate Bridge can be fun.

    So can those big high rises. You can feel 555 California move then you get above the 40th floor; and see it, if you look outside.

  13. #13
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    Default Re: 241 Bridge Flex

    Quote Originally Posted by CWSmith View Post
    Although designed this way, it is hard to understand how concrete and steel can flex that way.
    Likewise hard to get one's head around that concrete and steel, say in a high-rise, can burn, melt and slump when it gets hot enough.
    Speak softly and carry a mouthful of marbles.

  14. #14
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    Default Re: 241 Bridge Flex

    Quote Originally Posted by Jim Mahan View Post
    Likewise hard to get one's head around that concrete and steel, say in a high-rise, can burn, melt and slump when it gets hot enough.
    not to mention a building next door.

  15. #15
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    Default Re: 241 Bridge Flex

    Quote Originally Posted by Jim Mahan View Post
    Likewise hard to get one's head around that concrete and steel, say in a high-rise, can burn, melt and slump when it gets hot enough.
    Meh.

    All that stuff came from a volcano, anyway... or, at least an exploding star.

  16. #16
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    Default Re: 241 Bridge Flex

    I was stopped once on the Evergreen Floating Bridge on my motorcycle-- a wreck ahead had us all stopped for about 30 minutes. Standing there, I felt for the first time the amount the bridge deck flexed and rocked. It really is a boat
    Elect a clown expect a circus

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