Architecture, Building and Structure Design Cendere Viaduct by Yuksel Proje R&D and Design Center Cendere Viaduct is a transportation structure on the 3-Deck Great Istanbul Tunnel Project which is one of the largest transport infrastructure project planned to be built in Turkey. The most important building element describing design is the steel structure that is covering platform of viaduct. Various parametric analyses have been made to optimally solve the structural orientation. Three dimensional finite element structural analyses of viaduct has been conducted to determine reinforced concrete structural element dimensions. Steel structure is developed for aesthetic purposes.