Computers and Concrete

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Evaluation of time-dependent deflections on balanced cantilever bridges

  • Rincon, Luis F. (School of Civil Engineering, Universidad Industrial de Santander) ;
  • Viviescas, Alvaro (School of Civil Engineering, Universidad Industrial de Santander) ;
  • Osorio, Edison (Faculty of Civil Engineering, Universidad Antonio Narino) ;
  • Riveros-Jerez, Carlos A. (School of Engineering, Universidad de Antioquia) ;
  • Lozano-Galant, Jose Antonio (Universidad de Castilla-La Mancha)
  • Received : 2020.12.28
  • Accepted : 2021.11.10
  • Published : 2021.11.25
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Abstract

The use of prestressed concrete box girder bridges built by segmentally balanced cantilevers has bloomed in the last decades due to its significant structural and construction advantages in complex topographies. In Colombia, this typology is the most common solution for structures with spans ranging of 80-200 m. Despite its popularity, excessive deflections in bridges worldwide evidenced that time-dependent effects were underestimated. This problem has led to the constant updating of the creep and shrinkage models in international code standards. Differences observed between design processes of box girder bridges of the Colombian code and Eurocode, led to the need for a validation of in-service status of these structures. This study analyzes the long-term behavior of the Tablazo bridge with data scarcity. The measured leveling of this structure is compared with a finite-element model that consider the most widely used creep and shrinkage models in the literature. Finally, an adjusted model evidence excessive deflection on the bridge after six years. Monitoring of this bridge typology in Colombia and updating of the current design code is recommended.

Keywords

Acknowledgement

This research was developed with the support of Universidad Industrial de Santander, Universidad Antonio Narino, and Universidad de Antioquia. This research is funded by Universidad Industrial de Santander through the "Vicerrectoria de Investigacion y Extension" (Project No. 2437 of 2018). This research work was carried out thanks to the information provided by the Gobernacion de Santander. The results obtained from this investigation do not commit the mentioned governmental entities. The financial support of the project BIA2017-86811-C2-2-R funded with FEDER funds is also appreciated.

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