Seismic design check of the Vasco da Gama bridge and approach viaducts Case Study cable stayed road bridge and viaduct structures pile/soil interaction seismic analysis Hyder Consulting used LUSAS Bridge to perform a design check of the Vasco da Gama bridge and associated crossing of the Tagus at Lisbon, Portugal. The 18km long crossing comprises a series of concrete viaduct structures together with a 420m span cable stayed bridge over the main shipping channel. All structures are supported on piles extending through extensive alluvial deposits to a depth close to bedrock 60m below river bed level. Lisbon was devastated by an earthquake in 1774 so all parts of the crossing are designed to ensure minimum seismic damage in the event of another severe earthquake.LUSAS was used to calculate th

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