´╗┐ Jaroslav Navrátil, Milo­ Zich - Long-term deflections of cantilever segmental bridges (Vol VIII, No 3)

Vilnius Gediminas Technical UniversityRiga Technical UniversityTallinn University of TechnologyBaltic Road Association

 

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2015 Impact Factor: 0.519 ©2015 Thomson Reuters, 2015 Journal Citation Report®

ISSN 1822-427X print
ISSN 1822-4288 online
 

 

 
 

"The Baltic Journal of Road and Bridge Engineering"
Vilnius: Technika, 2013, Vol VIII, No 3, p. 190-195


Jaroslav Navrátil, Milo­ Zich

Long-term deflections of cantilever segmental bridges

DOI: 10.3846/bjrbe.2013.24
 
The long-term deflections of cast-in-place segmental bridges constructed using the cantilever method are often larger than the deflections expected in the design. A detailed structural analysis and monitoring of these types of bridges have therefore become a matter of interest. The paper gives a comprehensive analysis of phenomena that frequently conspire to cause long-span pre-stressed concrete bridges to deflect more than predicted. The analysis is based on a parametric study and long-term monitoring of the behaviour of a motorway bridge across the Vltava River in the Czech Republic. To reveal and quantify possible reasons for excessive bridge deflections, a detailed time-dependent analysis was carried out. The results of the study were compared with in-situ measurements that have been regularly carried out since the very early stage of construction. Theoretical values of the increments of deflections, pre-stressing forces and concrete strains were compared with the measurements.
 
Keywords: prestressed bridges, concrete bridges, long-term deflections, long-term behaviour, time-dependent analysis, creep, shrinkage.

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