• Question: What is your opinion of the new Queensferry Crossing in Scotland?

    Asked by rgirishdance to Rach, Olivia, Kayleigh, Holly on 9 Nov 2017.
    • Photo: Olivia Stodieck

      Olivia Stodieck answered on 9 Nov 2017:

      Looks impressive (from the pictures I can see online)! Designing and building bridges is not my area of expertise, but I can see why it took them 6 years. Funnily enough, there are some things that aircraft wings and bridges have in common – they are long, flexible structures – and there are famous examples of where this can become a problem… I’m thinking of the Tacoma Narrows Bridge for example, that collapsed in 1941 – the same year it was built – after suffering from self-excited vibrations that we typically call ‘flutter’. There are videos online, where you can see the bridge swinging and twisting until it breaks – and that was a modern cement structure! Another example is the London Millennium bridge, which started to swing and twist in certain wing conditions and when people walked over it at the same pace. It’s expensive when the engineers get it wrong!

    • Photo: Kayleigh Messer

      Kayleigh Messer answered on 13 Nov 2017:

      This was a useful question as I hadn’t heard of the Queensferry Crossing so I’ve learnt something new today!

      It certainly looks impressive.