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10008410
Performance of Bridge Approach Slabs in Bridge Construction: A Case Study
Abstract:
Long-term differential settlement between the bridge structure and the bridge embankment typically results in an abrupt grade change, causing driver discomfort, impairing driver safety, and exerting a potentially excessive impact traffic loading on the abutment. This paper has analysed a case of study showing the effect of an approaching slab realized in a bridge constructed at Tirane-Elbasan Motorway. The layer thickness under the slab is modeled as homogenous, the slab is a reinforced concrete structure and over that the asphaltic layers take place. Analysis indicates that reinforced concrete approaching slab distributes the stresses quite uniformly into the road fill layers and settlements varies in a range less than 2.50 cm in the total slab length of 6.00 m with a maximum slope of 1/240. Results taken from analytical analysis are compared with topographic measurements done on field and they carry great similarities.
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References:

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[2] Hoppe, E. J. Guidelines for the use, design and construction of bridge approach slabs, Virginia Transportation Research Council, Final Report VTRC 00-R4, November, 1999.
[3] Briaud, J. L., James, R. W. and Hoffman, S. B., NCHRP Synthesis of Highway Practice 234: Settlement of Bridge Approaches “Bump at the End of the Bridge”. National Academy Press, Washington, D.C., 1997.
[4] Long, J. H., Olson, S. M., Stark, T. D. and Samara, E. A. Differential movement at embank-bridge structure interface in Illinois, Journal of the Transportation Research Board, Page 53-60, January, 1998.
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[6] AASHTO LRFD Bridge Design Specifications – U.S. Units, Second Edition 1998.
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[8] Cai, C. S., Shi, X. M., Voyiadjis, G. Z. and Zhang Z. J. Structural performance of bridge approach slabs under embankment settlement, Journal of Bridge Engineering, ASCE, 10 (4), pp. 482-489, 2005.
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