By Edmund W. Jupp
The purpose of the "Watching" sequence is to attract cognizance to a couple of the very fascinating goods round us, issues that maybe we do not become aware of up to we would. the 1st used to be "Bridge Watching", and whilst this was once positioned "on the internet" it produced, to the shock of the writer, this type of friendly flood of electronic mail that one other was once written, known as "Water Watching". This, too, was once kindly obtained. So it used to be tempting to proceed with the subject matter. anyplace we cross we appear to meet bridges. often we have a tendency to use them nearly with out noticing them, other than after we see a very impressive instance just like the suspension bridge over the river Tamar in Devon. there isn't any try and hide every little thing approximately bridges, barely enough to make a bridge a extra fascinating item for you, or your digital camera, or your paint-box. I do wish it is going to assist you to get pleasure from bridges, anywhere you spot them. they're such great cozy issues to monitor, in particular in case you be aware of 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 take pleasure in it by yourself or in corporation, and climate is comparatively unimportant. It does not desire any unique garments or gear. (If you love, you should use box glasses or cameras, and note-books; yet they are not essential). you wish no education, no perform, no training. From all angles, bridge-watching is an enticing hobby, world wide. exit and luxuriate in those interesting constructions. you'll locate them addictive, within the nicest real way.
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Extra resources for Bridge Watching
Shearing or sliding. Tensile stress is what happens when you pull or stretch a piece of material. Parts of bridges which feel tensile stress are called " ties " and they tie together other parts. For example, the ropes of a swing tie the seat to the branch of a tree or a framework, and are in tension as the stress in them is tensile stress. So is the stress in your belt, (especially when you have eaten too much). Again, the cables of a suspension bridge are clearly in tension, like the rigging of a yacht.
So towards the face nearer the offset load the stress is increased; and towards the other face it decreases. The stress on the section is, therefore, no longer evenly distributed. It falls from a high stress on one edge to a smaller one, on the other face. e. a compression . Thus a tie can fail if either the load or the offset should be excessive. The point to bear in mind is that even though the load may be nominally satisfactory, the offset may introduce dangerously high stresses. When you see a tie where the load is obviously offset you will no doubt conclude that the force in that member is a comparatively small one.
Tension, compression and shear all turn up here and there, for they are related and to some extent interdependent, as we shall see. Although we shall be treating ties at first as though they carried tension alone, this is not strictly true, and we shall give more attention to this later. Struts and ties take forces which act along them, parallel with the axis; but whereas struts under load shorten and get fatter, ties get longer and thinner when stressed. Although ties are fairly easy to understand they are worth a chapter to themselves because of certain interesting features that may not be obvious to you at first.