By Edmund W. Jupp
The purpose of the "Watching" sequence is to attract consciousness to a couple of the very attention-grabbing goods round us, issues that maybe we do not discover up to we would. the 1st used to be "Bridge Watching", and whilst this used to be positioned "on the web" it produced, to the shock of the writer, this type of friendly flood of e mail that one other was once written, referred to as "Water Watching". This, too, was once kindly acquired. So it was once tempting to proceed with the subject matter. at any place we pass we appear to meet bridges. normally we have a tendency to use them virtually with out noticing them, other than once we see a very impressive instance just like the suspension bridge over the river Tamar in Devon. there's no try to conceal every thing approximately bridges, simply enough to make a bridge a extra fascinating item for you, or your digicam, or your paint-box. I do desire it is going to assist you to take pleasure in bridges, anywhere you notice them. they're such great cozy issues to observe, specially if you happen to understand 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 specified garments or apparatus. (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 revel in those attention-grabbing buildings. you'll locate them addictive, within the nicest real way.
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Additional info for Bridge Watching
So a tie that is part of a bridge for many years suffers many millions of stress changes in its life-time. The stiffer a member is, the higher will be the frequency of its vibrations. A tie can vibrate along its axis or by bending , and both of these can produce a fatigue failure. Such failures are rare because care is taken to reduce the loads on such members to a safe value. Below a certain stress the effect of a large number of variations is negligible. The designer uses what is known as a "safety factor".
When we go past the middle to a section say, 5 from the end A, the load itself has some leverage, equal to 1, in the opposite sense, tending to turn the beam the other way. Let us call the internal effort of the beam Mi. Then, using our little equation, we have : MI + (12 x 5) +(-24 x 2) = 0 MI + 60 -48 = 0 MI = -12 Thus, the internal resisting moment is 12; and the minus sign shows us that its direction is opposite to that of the one due to RA. If we call the distance from the left-hand abutment d, we can draw up a list of distances from the left-hand abutment (d) with the corresponding bending moments (M) at those points, like this: 34 Bridge Watching I hope you will work these out for yourself.
This causes much bobbing up and down, making some crossings quite entertaining. A pontoon bridge which was well-known to service men who fought in Iraq, or Mesopotamia as it was then known, will be referred to in a later chapter. The bridge was still there in the late 'thirties, giving good service, carrying people animals and vehicles safely if slowly across the Euphrates. During the last war, military needs for crossing rivers and canals were met by a remarkable development of the portable sections of the Bailey bridge, instead of pontoons.