PRESTRESSED CONCRETE TECHNOLOGY IN A DESIGN OF THE BRIDGE ACROSS THE RIVER EBRO, SPAIN

The bridge across the River Ebro "Lo Passador" is described in terms of its architectural and structural solution, static and dynamic analyses and a process of the construction. The bridge forms a self-anchored suspension structure of three spans of lengths 69.00+ 112.00 + 69.00 m. The deck is suspended on four suspension cables situated in the bridge axis. The torsionally stiff deck is formed by a composite four cell box girder formed by three steel webs, curved bottom flange and a concrete deck slab. The central web of a variable depth that protrudes above the deck slab and substitutes suspenders of the classical suspension structures naturally divides a local highway from pedestrian and cyclist routes. The main suspension cables are formed by BBRV strands anchored at the end diaphragms and deviated at the saddles of low pylons. The side spans together with short cantilever protruding into the main span were erected on temporary towers; the central portion of the main span was floated and consequently lifted in to design position.