Preliminary Studies in Bridge Design Being the First of a Series of Small Volum
Preliminary Studies in Bridge Design Being the First of a Series of Small Volum
Reginald Arthur Ryves
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In addi- tion it must be remembered that in many cases the width and height of the largest span are de- termined by the width and headway necessary to pass floating timber or other flotsam. At the same time there are crossings not unlike that shown on the diagram, for which it is worth while working out alternative designs between the limits, in the one direction of a single large span, and in the other direction of an embankment of full width pierced by culverts. A good deal depends upon the s...lope at which the sides of the embankment will safely stand, for this determines the lengths of the culverts. It is not difficult to find examples of single high arches in situations where the bank and culverts would be the cheaper form. When the bed of a stream in a much larger flood channel is only a little below the level of that channel and floods are frequent, it may be a good design to make a fill at about that level, blocking the bed of the stream and placing a number of small vents at the higher level.
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