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Modelling of an integral bridge abutment under cyclic thermal loading

Accepted version
Peer-reviewed

Type

Conference Object

Change log

Authors

Morley, Douglas George 
Madabhushi, Gopal 

Abstract

The jointless integral bridge eliminates maintenance associated with corroded bearings and expansion joints and has been widely adopted around the world to meet infrastructure resiliency and climate targets. Seasonal temperature change causes cyclic movements of the bridge deck leading to stress build-up in the retained backfill, a phenomenon that is inadequately understood and hence treated over conservatively in current design practice. In this research a centrifuge model was developed to replicate the cyclic movement of a 9 m integral abutment. Details of the actuation system development, scaling laws, and instrumentation are provided, as well as that of a Swandyne FE model used to estimate the actuator force requirement. LVDT and load cell results are given for a preliminary 60g centrifuge flight demonstrating system adequacy. This paper provides a basis for integral bridge model design but more broadly paves way for the investigation of how soil-structure stiffness influences stress ratcheting in granular soils.

Description

Keywords

Cyclic loading, Integral bridges, Physical modelling, Retaining walls, Soil ratcheting

Journal Title

Conference Name

10th International Conference on Physical Modelling in Geotechnics 2022 (ICPMG2022)

Journal ISSN

Volume Title

Publisher

2022 KOREAN GEOTECHNICAL SOCIETY (KGS)

Publisher DOI

Sponsorship
EPSRC (2439660)
EPSRC; National Highways