City Research Online

Abstract

The response of the seat-type abutment-backfill system under a dynamic excitation and its contribution to the structural system of the entire bridge is usually ignored in practice in Europe, since the designers prefer providing joint gap sizes larger than the required for the design earthquake. In the high seismic hazard areas of the US, various versions of Caltrans Guidelines prescribe a relatively simple way to account for the abutment - backfill interaction. However, the design of Caltrans abutments is based on the 'fully sacrificial' approach, wherein the backwall 'shears off' at an early stage, while in other countries the detailing of the deck-abutment interface is such that a plastic hinge forms at the base of the backwall which is detailed for ductile behaviour. In all cases, if assessment of the bridge safety beyond the design earthquake is sought (e.g. in fragility analysis), it is essential to properly account for the response of the bridge when the end joint is closed. This paper focuses on seat-t

Publication Type:	Conference or Workshop Item (Paper)
Additional Information:	This paper has been published in Proceedings of the International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering.
Publisher Keywords:	Bridges, Abutment, Backfill, Seismic design
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TG Bridge engineering
Departments:	School of Science & Technology > Engineering

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