Title: A New Dimension in Precast Prestressed Concrete Bridges for Congested Urban Areas in High Seismic Zones
Date: March-April, 1992
Volume: 37
Issue: 2
Page number: 44-66
Author(s): Jose Ma. Rioboo Martin
https://doi.org/10.15554/pcij.03011992.44.66

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Abstract

Twin precast, pretensioned concrete bridges were recently built over Tlalpan Freeway - in one of Mexico City's most densely populated areas. Designed for a clear span of 170 ft (52 m) over a major  freeway, they bring a new dimension to bridges for heavy traffic urban areas in seismic zones. Each of the twin bridges consists of three longitudinal girders with a total length of 1539 ft (469 m). Each  girder comprises 13 pretensioned elements of hollow box cross section with two upper flanges. The substructure consists of cast-in-place columns supported on a foundation of cast-in-place caissons and  precast, reinforced concrete piles. Seismic forces are resisted by longitudinal frames integrating columns with main support elements, and by transverse frames consisting of columns and transverse  reinforced concrete beams.