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Strengthening of a railway bridge with NSMR and CFRP tubes
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
2008 (English)In: FRP Composites in Civil Engineering: proceedings of the 4th International Conference on FRP Composites in Civil Engineering ; Zurich, Switzerland, 22 - 24 July 2008 / [ed] Masoud Motavalli, Dübendorf: EMPA-Akademie , 2008Conference paper (Refereed)
Abstract [en]

Strengthening of structures with CFRP is considered today as an accepted method in the upgrading of concrete structures. This paper presents the use of two different CFRP strengthening systems combined to extend the service life of a Swedish double-trough-doubletrack railway bridge, constructed in concrete with a 10 meter span. One system is the reliable NSMR (Near Surface Mounted Reinforcement) while the other is new. They were used with the intention to strengthen the interior of a concrete structure using integrated CFRP tubes. Both systems were used to increase the tensile flexural strength of the slab transverse to the tracks. NSMR bars were positioned in the bottom concrete cover of the trough's bottom-slabs, while the new system was inserted in holes drilled through the bridge in the cross direction and located in the upper part of the slab. In connection with the strengthening monitoring was conducted in order to obtain an understanding of the bridge behaviour before and after strengthening, and to demonstrate any effects of the extra CFRP reinforcement. Results from these measurements are presented together with how the strengthening work was carried out. Sensors on bars and tubes show evidence of utilization of the CFRP while displacement sensors and strain gauges on the steel reinforcement show minor effect due to the small loads in the service limit state.

Place, publisher, year, edition, pages
Dübendorf: EMPA-Akademie , 2008.
Research subject
Structural Engineering
URN: urn:nbn:se:ltu:diva-39485Local ID: e4341a40-c105-11dd-a054-000ea68e967bISBN: 978-3-905594-50-8OAI: diva2:1012998
International Conference on FRP Composites in Civil Engineering : 22/07/2008 - 24/07/2008
Godkänd; 2008; 20081203 (benand)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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