Strengthening of a railway bridge with NSMR and CFRP tubes

Björn Täljsten, Anders Bennitz, Georg Danielsson

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Abstract

Strengthening of structures with CFRP is today considered an accepted method to upgrade concrete structures. In this paper two different CFRP strengthening systems are combined to give extended service life to a Swedish double-trough-double-track railway bridge, constructed in concrete with a 10 meter span. One system is the reliable NSMR (Near Surface Mounted Reinforcement) system while the other one is new; intended to strengthen the interior of a concrete structure, and the other system uses CFRP tubes integrated in drilled holes in the bridge. Both systems are used to increase tensile flexural strength of the slab transverse to the tracks. NSMR bars are positioned in the concrete cover on the underside of the bridge, while the new system is inserted in holes drilled through the bridge, in the cross direction and located in the upper part of the bridge slab. In connection with the strengthening monitoring has been carried out; this to obtain an understanding of the bridge behavior 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 has been carried out. Sensors on bars and tubes display proofs of utilization of the CFRP while displacement sensors and strain gauges on the steel reinforcement due to the small loads in the service limit state show minor effect.
Original languageEnglish
Title of host publicationFRP Composites in Civil Engineering : Proceedings of the 4. International Conference on FRP Composites in Civil Engineering
PublisherRilem publications
Publication date2008
ISBN (Print)978-3-5594-50
Publication statusPublished - 2008
Event4th International Conference on FRP Composites in Civil Engineering - Zurich, Switzerland
Duration: 22 Jul 200824 Jul 2008
Conference number: 4
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Conference

Conference4th International Conference on FRP Composites in Civil Engineering
Number4
CountrySwitzerland
CityZurich
Period22/07/200824/07/2008
Internet address

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