Abstract

BENJUMEA ROYERO, José; SUAREZ RODRIGUEZ, Mario  and  CHIO CHO, Gustavo. STRUCTURAL BEHAVIOR OF EXTRADOSED BRIDGES DURING CANTILEVER CONSTRUCTION. Rev.EIA.Esc.Ing.Antioq [online]. 2013, n.20, pp.111-125. ISSN 1794-1237.

This paper presents the results of the study of the structural behavior during cantilever construction of a concrete, three-span (60+100+60 m) extradosed bridge, numerically modeled using a finite element model developed in the software SAP2000. Creep and shrinkage of concrete, as P-delta effects were taken into account. The study focuses on deck, extradosed cables and piers behavior, during construction, and from the time when the bridge is closed until fifty years, at which time all differed effects have taken place. It was possible to glimpse the importance of considering the differed effects over time in the staged-construction analysis of the bridge. For example, considerable variations in forces and displacements were found in the deck, while a 10% tension loss in extradosed cables occurs. In the piers, differed effects introduce large horizontal displacements at the top which generate excessive bending moments at the bottom. This fact makes it necessary to apply a force during the construction of the closing segment to correct such phenomenon.

Keywords : Construction; Shrinkage; Creep; Extradosed Bridges; Balanced Cantilever Method.

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