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structures (deck and piers) develop only elastic behavior. This papers presents a detailed review of the design process as well as a time journey during construction Keywords:, FE non linear analysis, seismic isolation, time-dependent material properties, staged construction, balanced cantilever bridge 1. INTRODUCTION This bridge is “balanced cantilever girder” type and it is characterized by a central 155m span, with two side symmetric 77.5m spans. The total length of the bridge, including segments at abutments supports, is 312.0m. The deck shows

interesting parts of the design process for the specific case. Namely, time dependent properties of the materials have been considered, and extensive “staged construction” analyses have been carried out to ensure safety in each phase of the complex life of the bridges, while at the same time guaranteeing significant cost savings. Keywords: steel-concrete composite deck, FE analysis, seismic isolation, time-dependent material properties, staged construction 1. INTRODUCTION The two viaducts share the same cross section and statical scheme, while differing

& Aitcin P-C: “Determination of Elastic Properties of High-Performance Concrete at Early Ages,” ACI Material Journal , Vol. 99, No.1, January 2002, pp. 37-41. 5. Oluokun F A, Burdette E G & Deatherage J H: “Elastic Modulus, Poisson’s Ratio and Compressive Strength Relationship at Early Ages,” ACI Journal , Vol. 88, No.1, January 1991, pp. 3-10. 6. EN 1992-1-1: “Eurocode 2: Design of Concrete Structures,” Part 1-1 “General Rules and Rules for Buildings,” European Committee for Standardisation (CEN), Brussels, 2004, 236 p. 7. Bryne L E: “Time Dependent Material