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Pro128-6

3D-FE MODEL FOR HOLISTIC ANALYSIS OF THE LONG-TERM DEFLECTION OF PRESTRESSED CANTILEVER BRIDGES



Author(s): Daniel Gheorghiu, Dirk Schlicke, Nguyen Viet Tue
Paper Category: proceedings
Book Title: Proceedings of the International Conference on Sustainable Materials,
Systems and Structures (SMSS2019)
Editor(s): Ivana Carević Stjepan Lakušić Dirk Schlicke
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication Year: 2019
Pages: 34 - 35
Total Pages: 2
Language: English


Abstract: Unexpected deflections of cantilever bridges is a often reported phenomena worldwide.
Different explanatory approaches exist, whereby the inaccuracy in the current models for creep
and shrinkage of concrete is expected to have an important influence, e.g. [1]. But also the
consequences of underestimated prestress losses are discussed in this context, e.g. [2].
Based on observation, that the real deflection of the majority of all concrete bridges (not
only cantilever bridges) complies quite well with the predicted deformation from the design
with current models for creep and shrinkage, it is assumed, that properties in geometry,
slenderness, prestress as well as construction process may have a predominant influence of the
deflection behaviour of cantilever bridges rather than only a possible inaccuracy of the models
for creep and shrinkage. The interplay of these parameters is currently analysed with a
comprehensive research programme based on the long-term deflection of the valley crossing
Schottwien in Austria. This research programme consists of an on-site monitoring of the 250 m
spanning main field of this bridge, numerical investigations with commonly used beam models
and time-discrete simulations with 3D-volume models, as well as testing of the creep behaviour
of samples taken from a comparable bridge with same age and level of stressing.
This contribution gives insights on the previous investigations with the 3D-volume model.



Online Publication: 2019
Publication Type: full text
Public price(euros): 0.00


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