The Siberia connector is composed of two straight and parallel Bridges (one per bound), each one with three continuous spans of 73+114+73 ft (22.5+35+22.5 m) for a total length of 262 ft (80 m). The superstructure is a post-tensioned cast-in-place concrete hollow-core box girder with a constant depth of 4 ft (1.15 m). It is 32 ft (10 m) wide to accommodate two traffic lanes of 11 ft (3.5 m), an outer shoulder of 5 ft (1.8 m), an inner shoulder of 20’’ (0.5 m) and two traffic barriers. The deck was built using a 3-phase segmental construction method.
The deck is seismic isolated using multilayer low damping steel-reinforced elastomeric bearings as seismic isolators. The deck is supported on two intermediate circular single column piers with deep foundations and an 88 ft (27 m) reinforced concrete box on each side that fulfills the functions of abutment and transfer element for loads and settlements between the reinforced soil wall at the approaches and the superstructure. These boxes have a deep foundation on one side in order to accommodate the expected settlements with an imperceptible change in slope.
Design was completed meeting the AASHTO LRFD requirements. The bridge is seismically protected using dynamic isolators designed under the AASHTO requirements as well. In order to reduce the effects of settlements due to the high soil compressibility, the height of the backfill was reduced and the settlement controlled using a concrete box as abutment. The construction began with the piers and the side-concrete boxes, followed by the backfills, and finally the deck segmental construction.
The segmental construction method used for construction avoided any interference with the traffic below and was used to complete the structure on time and budget.