A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
CFRP Strengthening and Monitoring of a Box Girder Bridge
Abstract The Gröndal Bridge, is a large freivorbau bridge (pre-stressed concrete box bridge), approximately 400 meters in length with a free span of 120 m. It was opened to tram traffic in 2000. Just after opening cracks were noticed in the webs, these cracks have then increased, the size of the largest cracks exceeded 0.5 mm, and at the end of 2001 the bridge was temporarily strengthened. This was carried out with externally placed prestressed steel stays. The reason for cracking is still debated and will be further discussed in this paper. Nevertheless, it was clear that the bridge needed to be strengthened. The strengthening methods used were CFRP laminates in the Service Limit State (SLS) and prestressed dywidag stays in the Ultimate Limit State (ULS). The strengthening was carried out during 2002. At the same time monitoring of the bridge commenced, using LVDT crack gauges as well as optical fibre sensors. To date, a large amount of data has been collected and the data is still under evaluation. Primary results show that the largest stress can be referred to the temperature load and that the contribution from the live load is minor. The results from the monitoring show that the CFRP laminates work as intended and that the cracks are not propagating
CFRP Strengthening and Monitoring of a Box Girder Bridge
Abstract The Gröndal Bridge, is a large freivorbau bridge (pre-stressed concrete box bridge), approximately 400 meters in length with a free span of 120 m. It was opened to tram traffic in 2000. Just after opening cracks were noticed in the webs, these cracks have then increased, the size of the largest cracks exceeded 0.5 mm, and at the end of 2001 the bridge was temporarily strengthened. This was carried out with externally placed prestressed steel stays. The reason for cracking is still debated and will be further discussed in this paper. Nevertheless, it was clear that the bridge needed to be strengthened. The strengthening methods used were CFRP laminates in the Service Limit State (SLS) and prestressed dywidag stays in the Ultimate Limit State (ULS). The strengthening was carried out during 2002. At the same time monitoring of the bridge commenced, using LVDT crack gauges as well as optical fibre sensors. To date, a large amount of data has been collected and the data is still under evaluation. Primary results show that the largest stress can be referred to the temperature load and that the contribution from the live load is minor. The results from the monitoring show that the CFRP laminates work as intended and that the cracks are not propagating
CFRP Strengthening and Monitoring of a Box Girder Bridge
Täljsten, B. (author)
2005-01-01
10 pages
Article/Chapter (Book)
Electronic Resource
English
CFRP Strengthening and Monitoring of a Box Girder Bridge
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