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Vance Bow
Добавлен 28 фев 2012
Видео
Understanding the physics of a stone arch bridge
Просмотров 4 тыс.4 года назад
Understanding the physics of a stone arch bridge
Plotting compression arc using tension (a string)
Просмотров 1,9 тыс.4 года назад
Plotting compression arc using tension (a string)
Splitting Stone with Wedge and Feather
Просмотров 2,4 тыс.4 года назад
Splitting Stone with Wedge and Feather
Ok Very informative and a nice presentation. There were a few loss of audio issues about a third of the way in. -Z-
Thanks ~ Such a straightforward and explanatory way to describe bridge building that the ancients would have recognised with their bridge building. I found your site after looking at very old stone bridges in the UK and wanted to be sure of the basic physics and geometry. 🙂
Sorry to be pedantic, but the curve of a hanging chain or rope is not a parabola - it's a catenary.
Hey man, I know nothing of this sort. I was wondering how shallow of a arch you can make had hope to bridge a gap of about 2-3 feet with bricks and add a keystone. Yet even the arch you just made is to deep.
The arch can be quite shallow and still hold weight. (Take a look at the Ponte Santa Trinita). The bigger concern is going to be how solid the foundations of each side are. With a steep arch, there is a bit of room for the bridge to settle and still remain solid. With a flatter arc, though, there is a tremendous amount of outward pressure exerted against the foundations which can cause them to shift laterally, causing the arch to flatten further. If there is too much movement laterally, the bridge will buckle. Quick answer: Arcs can be quite flat. The flatter the arc, though, the firmer the foundations need to be to prevent lateral movement.
well prepared. boisebible.edu