Application of Preflexed Composite Beams to Continuous Bridges

by Hiroshi Watanabe, Kawada Industries Inc, Osaka, Japan,
Yukio Maeda, Kawada Industries Inc, Osaka, Japan,

Abstract: A preflexed beam is a type of concrete encased steel beam of which prestressing has been introduced in the lower flange concrete. Recently, the preflexed composite beams were applied to continuous bridges, because they are superior to simply supported ones for increasing span length and improving performance against traffic and earthquakes. To find a better structural system for the continuous bridge, static and fatigue tests on four kinds of models of continuous beams, combined with preflexed beams, were carried out. Using the test results, design calculations for the application of such a type of continuous beam to an actual bridge were carried out. Finally, the comparison of a simple girder bridge and this type of continuous girder bridge was made in terms of the steel weight and total cost.

Subject Headings: Composite beams | Continuous bridges | Bridge tests | Continuous beams | Girder bridges | Steel bridges | Steel beams | Composite bridges

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