I agree. It would be much smarter to google “boners and erections.”
Definitely safe for work. They misspelled the name of the Bonner Bridge. It’s a time lapse view of some of the construction.
Galloping Gertie was a spectacular example of a design fault leading to the destruction of a suspension bridge. Design faults still arise from time to time that may catch design engineers by surprise.
An example of this was the Millenium footbridge across the river Thames that had a disconcerting wobble when it first opened in 2000. This led to a vigorous exchange of views between the architect who wanted a particular style with no suspension towers, a spectacular ‘blade of the light’ and the bridge engineers who built it. While it was never going to fall apart, something had to be done to fix the wobble and it had to be fitted with dampers to absorb the tendency of walkers to subconsciously synchronise their steps.
Here is a BBC science program that attempts to explain it all with models and demonstrations of the resonance problem that can affect bridge design.
I experienced the wobble first hand when it opened and I found it quite acceptable. I did, however, notice a couple of old ladies with walking sticks having difficulty and being enthusiastically photographed by the press who were clearly onto something. I was not at all surprised when the scandal-hungry newspapers splashed a big story the next day that led to a lot of finger pointing by the professions involved regarding who was responsible for the bill.The bridge was duly fixed and has been pretty solid ever since.
It shows that engineering projects can have unforeseen flaws that take designers by surprise no matter how diligent their work, especially when the design is new and uses innovative techniques.
My mate Trigger, a road sweeper, has a broom like that. He has had the same broom for 15 years. It has had 8 new handles and 12 new heads but he swears it is the same broom of 15 years ago.
I came in to this thread to post just this example. The Forth Road Bridge is the same age as me. I also deal with more weight than I was expected to
The new Queensferry Crossing is now open, with a few teething troubles. They are hoping the tailbacks are caused by people just wanting to drive over the new bridge. It should calm down once people are used to the new approaches and the novelty wears off.
Ding! That wasn’t the Dam busters, it was 633 Squadron.
I’m still using my computer from 1995 in some sense; I never replaced all of it at once- just swapped out various components from time to time.
I have replaced my computer a few times, but I assure you all I only use recycled or reused bits. Never new virgin ones. </virtue signal>
Nope.
Hmmm. Arguments for both. I’d always heard 633 Squadron as the main influence, and this seems pretty compelling:
What about the Mosul dam built on gypsum rock? Seems to need constant upkeep/repair…
No, it’s just someone driving along the current bridge, showing some construction equipment and rafts off to the side.
Not always.
This bridge (which was based on the design of the Brooklyn bridge) collapsed because the shale that is was built on, moved from a landslide causing it to partially collapse after 14 years of use.
Interestingly enough, it was replaced by a conventional bridge
Little Rock’s main bridge connection to N Little Rock was replaced last year.
The original Broadway bridge lasted 93 years. It’s a main traffic artery and gets a massive amount of vehicles.
It’s was very solidly built and difficult to tear down. The replacement had been planned and scheduled several years earlier.