Long-term deflection monitoring of prestressed concrete bridges retrofitted by external post-tensioning - examples from Switzerland

The paper presents the findings of the monitoring of the long-term deflections of three bridges which were retrofitted with external post-tensioning. The emphasis is on the effect of the additional post-tensioning on the bridge behaviour in the years following the retrofit. The bridges are highway prestressed concrete box-girder bridges built by the balanced cantilever method and retrofitted with additional exterior post-tensioning cables for deflection control. It is shown that external posttensioning can be a successful retrofitting technique for bridges with serviceability limit state problems. The reported examples also highlight the value of long term monitoring of concrete bridges for the assessment of bridges, and for the design of retrofitting scheme.


Published in:
IABSE Rio 1999
Presented at:
IABSE Rio 1999
Year:
1999
Publisher:
Rio de Janeiro, Brazil, IABSE Rio 1999
Keywords:
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 Record created 2007-09-12, last modified 2018-03-16

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