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Continuous Concrete Bridges (Classic Reprint)

ISBN: 9781149331897
Publisher: Nabu Press
Publication Date: 2010-05-13
Number of pages: 122
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Excerpt from Continuous Concrete Bridges
The span ratios given here are for continuous decks which are not built integral with the supports. Spans of these ratios will give moments requiring the same depth of sections at centerlines of all spans and the same amount of steel, thus providing a balanced design at minimum cost for the deck. When decks are built integral with the supports the span ratios can be in creased somewhat; this increase will depend upon the stiffness of supports.
In long bridges across overflow areas, long grade separations, or elevated highways, a free choice of span length will usually permit a selection to give balanced sections. This is desirable for practical arrangement of steel and also for good appearance. For girder bridges under average conditions, the economical length of end spans of groups of continuous spans not integral with supports is approximately as follows for various types of reinforced con crete substructures.
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