By Edmund W. Jupp
The purpose of the "Watching" sequence is to attract recognition to a few of the very fascinating goods round us, issues that maybe we do not realize up to we'd. the 1st was once "Bridge Watching", and while this used to be positioned "on the internet" it produced, to the shock of the writer, one of these friendly flood of e mail that one other used to be written, referred to as "Water Watching". This, too, was once kindly got. So it used to be tempting to proceed with the subject. at any place we move we appear to meet bridges. commonly we have a tendency to use them virtually with out noticing them, other than once we see a very awesome instance just like the suspension bridge over the river Tamar in Devon. there's no try and disguise every little thing approximately bridges, barely enough to make a bridge a extra fascinating item for you, or your digicam, or your paint-box. I do desire it's going to assist you to take pleasure in bridges, anywhere you spot them. they're such great cozy issues to observe, specially if you happen to comprehend anything approximately them. As both a pastime or an highbrow pursuit bridge-watching has a lot to commend it, for individuals of every age and persuasions. you do not have to pay a subscription. you could get pleasure from it by yourself or in corporation, and climate is comparatively unimportant. It does not desire any targeted garments or apparatus. (If you're keen on, you should use box glasses or cameras, and note-books; yet they are not essential). you would like no education, no perform, no training. From all angles, bridge-watching is an enticing hobby, world wide. exit and luxuriate in those attention-grabbing buildings. you'll locate them addictive, within the nicest real way.
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Extra resources for Bridge Watching
Sometimes a simple node is formed by pinning the ends . When the ends of a tie are threaded like this the rods are often thicker at the ends so that the threads stick out from the rod rather than being cut into it. Cutting the screw thread into a rod removes so much of the material that the rod can be considerably weakened there. If a cable is used as a tie the ends are often "swaged", or provided with a screwed or pierced barrel to which a bottle screw can be attached. This is thicker than the cable, of course, as it has to carry the full load.
Suppose you have a bending moment diagram for a beam , and at some point along the span you see from the diagram that the moment there is say, 80. Now suppose that you have two steel plates to use for the flanges, each of which can take a force of 160. The value of a couple is the distance between the forces multiplied by one of them. So if your steel plates are spaced apart by a distance of 1, then they will supply a couple worth 160 x 1 = 160. That is more than you need. Spacing them apart a distance of 1/2 produces a couple worth 160 x 1/2 = 80, which is just right.
When we know how much bending effect there is at any particular point we can design that section so as to be stiff enough and strong enough to handle that amount of bending. In an earlier chapter we saw how, in a solid beam , the stress is not the same all the way across the section. I think we had better look at that a little more closely now. You will remember that because the higher stresses are near the upper and lower surfaces much material can be saved if the section is wider there, like an I-section.
Bridge Watching by Edmund W. Jupp