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Predicting the earth pressure on integral bridge abutments

Predicting the earth pressure on integral bridge abutments
Predicting the earth pressure on integral bridge abutments
The soil adjacent to integral bridge abutments experiences daily and annual temperature-induced cyclic loading due to expansion and contraction of the bridge deck. This causes a particular soil response and complicated soil-structure interaction problem, with considerable uncertainties in design. This paper describes a method of calculating the effects of thermal cycling by using the results of laboratory cyclic stress path testing within a numerical model. Samples of stiff clay and sand were tested in the triaxial apparatus under stress paths typical for behind an integral abutment. Distinct behavior was observed for the two soils, with stiff clay showing relatively little buildup of lateral stress with cycles, whereas for sand stresses continued to increase, exceeding at-rest and approaching full passive pressures. To explore the implications of these findings on the soil-abutment interaction and to estimate the lateral stresses acting on the abutment as a whole, a numerical (finite difference) model was developed with a soil model reproducing the sand behavior at element level. The numerical model gave good agreement with published centrifuge and field data, and indicated that the stress profile specified in some current standards is conservative. Influence of abutment stiffness and wall friction is also quantified.
Bridge abutments, Temperature effects, Soil-structure interactions, Cyclic loads, Triaxial tests, Numerical analysis
1084-0702
371-381
Bloodworth, Alan G.
08ac0375-0691-41d4-937d-d7d643dc8ddb
Xu, Ming
51f8f898-0bc6-40eb-aad0-ad612bd4857e
Banks, James R
4d63f1f0-2578-4ec4-94ae-108742a40339
Clayton, Chris R.I.
8397d691-b35b-4d3f-a6d8-40678f233869
Bloodworth, Alan G.
08ac0375-0691-41d4-937d-d7d643dc8ddb
Xu, Ming
51f8f898-0bc6-40eb-aad0-ad612bd4857e
Banks, James R
4d63f1f0-2578-4ec4-94ae-108742a40339
Clayton, Chris R.I.
8397d691-b35b-4d3f-a6d8-40678f233869

Bloodworth, Alan G., Xu, Ming, Banks, James R and Clayton, Chris R.I. (2011) Predicting the earth pressure on integral bridge abutments. Journal of Bridge Engineering, 17 (2), 371-381. (doi:10.1061/(ASCE)BE.1943-5592.0000263).

Record type: Article

Abstract

The soil adjacent to integral bridge abutments experiences daily and annual temperature-induced cyclic loading due to expansion and contraction of the bridge deck. This causes a particular soil response and complicated soil-structure interaction problem, with considerable uncertainties in design. This paper describes a method of calculating the effects of thermal cycling by using the results of laboratory cyclic stress path testing within a numerical model. Samples of stiff clay and sand were tested in the triaxial apparatus under stress paths typical for behind an integral abutment. Distinct behavior was observed for the two soils, with stiff clay showing relatively little buildup of lateral stress with cycles, whereas for sand stresses continued to increase, exceeding at-rest and approaching full passive pressures. To explore the implications of these findings on the soil-abutment interaction and to estimate the lateral stresses acting on the abutment as a whole, a numerical (finite difference) model was developed with a soil model reproducing the sand behavior at element level. The numerical model gave good agreement with published centrifuge and field data, and indicated that the stress profile specified in some current standards is conservative. Influence of abutment stiffness and wall friction is also quantified.

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More information

Published date: 25 April 2011
Keywords: Bridge abutments, Temperature effects, Soil-structure interactions, Cyclic loads, Triaxial tests, Numerical analysis
Organisations: Civil Engineering & the Environment

Identifiers

Local EPrints ID: 186165
URI: https://eprints.soton.ac.uk/id/eprint/186165
ISSN: 1084-0702
PURE UUID: e1105dd2-0f14-4d48-8c1c-f90d12dc7dae
ORCID for Chris R.I. Clayton: ORCID iD orcid.org/0000-0003-0071-8437

Catalogue record

Date deposited: 12 May 2011 12:46
Last modified: 24 Sep 2019 00:51

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