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Protecting a five span prestressed bridge against ground deformations
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.ORCID-id: 0000-0001-8889-4237
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.ORCID-id: 0000-0002-1398-6118
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
Visa övriga samt affilieringar
2015 (Engelska)Ingår i: IABSE Conference Geneva 2015: Structural Engineering: Providing Solutions to Global Challenges, Geneva: International Association for Bridge and Structural Engineering, 2015, s. 255-262Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Abstract [en]

A 55 year-old, 121.5 m long, five span prestressed bridge was situated in the deformation zone close to a mine in Kiruna in northern Sweden. There was a risk for uneven ground deformations so the bridge was analyzed and monitored. Results and measures taken to ascertain the robustness of the bridge are presented.The analysis resulted in an estimate that the bridge could sustain 24 mm in uneven horizontal and 83 mm in uneven vertical displacement of the two supports of a span. To be able to sustain larger deformations, the columns of the bridge were provided with joints, where shims could be inserted to counteract the settlements. To accomplish this, each one of the 18 columns of the bridge was unloaded by help of provisional steel supports. The column was then cut and a new foot was mounted to it. This made it possible to lift each individual column with two jacks, when needed, and to adjust its height by inserting or taking away shim plates.The deformations of the bridge and the surrounding ground were monitored. The eigenmodes of the bridge were studied with accelerometers and by analysis with finite elements (FE) models. Comparison indicated good agreement between the model and the actual bridge, with calculated eigenfrequencies of 2.17, 4.15 and 4.67 Hz, for the first transversal, vertical and torsional modes, respectively. Measurements during winter resulted in higher values due to increased stiffness caused by frozen materials.

Ort, förlag, år, upplaga, sidor
Geneva: International Association for Bridge and Structural Engineering, 2015. s. 255-262
Nationell ämneskategori
Infrastrukturteknik Matematisk analys
Forskningsämne
Konstruktionsteknik; Matematik; Attraktivt samhällsbyggande (FOI)
Identifikatorer
URN: urn:nbn:se:ltu:diva-34954Lokalt ID: 94595912-e47e-4600-8e52-15aff592265eISBN: 9783857481406 (tryckt)OAI: oai:DiVA.org:ltu-34954DiVA, id: diva2:1008206
Konferens
IABSE Conference : Structural Engineering: Providing Solutions to Global Challenges 23/09/2015 - 25/09/2015
Anmärkning
Godkänd; 2015; 20150527 (nikbag)Tillgänglig från: 2016-09-30 Skapad: 2016-09-30 Senast uppdaterad: 2018-03-26Bibliografiskt granskad

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http://www.iabse.org/Geneva2015Report

Personposter BETA

Bagge, NiklasNilimaa, JonnyEnochsson, OlaSabourova, NataliaGrip, NiklasEmborg, MatsElfgren, LennartTu, Yongming

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Bagge, NiklasNilimaa, JonnyEnochsson, OlaSabourova, NataliaGrip, NiklasEmborg, MatsElfgren, LennartTu, Yongming
Av organisationen
Byggkonstruktion och -produktionMatematiska vetenskaper
InfrastrukturteknikMatematisk analys

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