BEWS carried out the detailed development of the variant presented by COPISA for the bridge at Pk44+000 of the San José – Caldera highway to bridge an area with complicated geotechnical characteristics with large landslides.
The alternative presented by Copisa and contracted by Globalvía consists of a 145 meter span bridge with a bow-string typology with a lower deck with a strong longitudinal slope. The deck is 12.50m wide, housing 3 circulation lanes with two side shoulders.
The bridge consists of two parallel arches separated by 14.30 m, formed by box beams with a square section. The arches have a central height of 22.50 meters and are laterally braced by a K-bracing system formed by circular tubes.
Below, the brace is made up of 2 double-T longitudinal brace beams. Between both longitudinal beams, transverse beams are arranged every 2.50m, with a (200+50)mm thick concrete slab, arranged on a corrugated sheet. The longitudinal braces hang from the arch through a system of inclined tubes-hangers (formed by circular tubes) that also provide rigidity to the assembly against non-symmetrical actions.
Longitudinally, the seismic conception of the bridge is based on seismic isolation, achieved with HDR type strapped neoprene supports with high damping. Transversely, a stopper is arranged so as not to require a road joint with displacement characteristics in two directions.