Located at about 18 mi (30 km) north of Bogotá, Portachuelo Viaduct is one the first applications of seismic isolation of bridges in Colombia. The viaduct consists of two parallel 1190 ft (363 m) segmental structures that describe a spiral curve in two thirds of their length and a straight line.
Both structures are 33 ft (10.3 m) wide and split into two traffic lanes of 11 ft (3.65 m), a 5 ft (1.8 m) shoulder and two lateral prefabricated barriers that provide protection to vehicles and give an aesthetic touch to the bridge. The superstructure consists of a post-tensioned cast-in place concrete hollow-core box girder with constant high of 3 ft (1.05 m) and 13 spans of 68+36*88+68 ft (21+11*27+21 m). The segmental construction method applied was performed in 5 phases, at the end of which it was obtained a continuous and comfortable surface for transit. The substructure consists of seismic protected reinforced concrete piers and abutments. The seismic isolation system is provided with multilayer steel-reinforced elastomeric
bearings used as seismic isolators. All the foundations are deep using 24‘‘ (0.6 m) piles.
Design was carried out meeting the AASHTO LRFD requirements. The bridge is protected using seismic isolators designed under the AASHTO requirements as well. The segmental building method allowed for continuous traffic during construction.