Bearing Restraint in Slab‐on‐Girder Bridges
Publication: Journal of Structural Engineering
Volume 114, Issue 12
Abstract
It is well established, as a result of many field tests, that slab‐ongirder bridges are usually stiffer in flexure than is predicted by normal deflection analysis. An example is given in the paper to support this contention. Restraint to horizontal movement at girder supports is identified by field tests on actual bridges as the main reason for this enhanced stiffness. Simple expressions are derived in the paper, by use of which the beneficial effect of girder support restraint can be taken into account in the evaluation of the load‐carrying capacity of single‐span existing bridges. These simple expressions relate to girder deflections and moments, and to the stresses in the bottom flanges of the girders, all of which reduce differently as a consequence of bearing restraint. It is shown that girder restraint can reduce live load moments in existing single‐span slab‐on‐girder bridges by up to 20%
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References
1.
Bakht, B. (1988a). “Testing of an old short span slab‐on‐girder bridge.” Structural Research Report SRR‐88‐01, Ministry of Transportation of Ontario, Downsview, Ontario, Canada.
2.
Bakht, B. (1986b). “Observed behaviour of a new medium span slab‐on‐girder bridge.” Structures Research Report SRR‐88‐02, Ministry of Transportation of Ontario, Downsview, Ontario, Canada.
3.
Billing, J. R. (1984). “Dynamic loading and testing of bridges in Ontario.” Can. J. Civ. Engrg., 11(4), 833–843.
4.
QUEST, Program for the analysis of box girder bridges using quadrilateral finite elements. (1974). Highway Engineering Computer Branch, Department of Transport, London, England.
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Copyright © 1988 ASCE.
History
Published online: Dec 1, 1988
Published in print: Dec 1988
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