Approach viaduct design for the Vasco Da Gama bridge Case Study reinforced concrete diaphragms prestress analysis and seismic loading reinforcement quantities calculated Kvaerner Technology Ltd is one of a consortium of companies designing the New Tagus Crossing in Lisbon, Portugal. It used the extensive solid modelling capabilities of LUSAS Bridge for analysing reinforced concrete diaphragms on the 6.5km long central viaduct section of the crossing. Each 77m long viaduct span unit consists of 8 precast box sections that are assembled, prestressed and concreted together before ?oating out and jacking into position onto piers initially on temporary supports. Once adjoining spans are in place, continuity prestress tendons are ?xed through the diaphragm wallsinto adjacent units and a 1m wide

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