In this report the behaviour of flexible corrugated steel buried structures of spans ranging between 0.9 metres and 14 metres is investigated, with particular emphasis upon large span structures of 7 metres and above which incorporate thrust beams. The report includes a review of design methods, a finite element study of the behaviour of arch and ellipse large span structures, and a review of technical literature encompassing model testing, full scale load testing and finite element modelling (FEM). The basis for a practical design method for large span ellipse and arch structures incorporating thurst beams is given.

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