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Nilsson, Mattias
Publications (7 of 7) Show all publications
Nilsson, M. (2012). Secondary strain in web stiffeners in steel and composite bridges (ed.). (Licentiate dissertation). Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>Secondary strain in web stiffeners in steel and composite bridges
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Alternative title[sv]
Sekundära påkänningar i livavstyvningar i stål- och samverkansbroar
Abstract [sv]

Sommaren 2006 så upptäcktes ett flertal sprickor på bron över Vårby fjärden i närheten av Stockholm. Samtliga sprickor syntes ha uppstått i svetsar som förbinder vertikala livavstyvningar med huvudbalkarnas överflänsar. På uppdrag av Trafikverket så har en utredning genomförts med syftet att klarlägga orsaken till sprickornas uppkomst. Utredningen omfattande bl.a.-Töjningsmätningar på bron. -Delskadeberäkningar enligt Palmgren-Miner och utförda på basis av långtidsmätningarna-Finita element analyser-Mikroskopanalyser av bit av en svets med en sprickyta-Tester utförda på en mindre samverkansbro vid Luleå Tekniska Universitet (LTU)Resultatet av utredningen påvisar entydigt att orsaken till sprickorna är utmattning. De för utmattning relevanta spänningarna tros vara resultatet av påtvingade rotationer på styva livavstyvningar och tvärförband. Rotationerna uppstår då betongfarbanan böjer sig för tunga fordon. Med all rimlig visshet så förbisågs denna sekundära effekt när bron konstruerades.Tester på en mindre samverkansbro har utförts vid Luleå tekniska Universitet. Två olika typer av tvärförband testades. Testerna och resultatet av dessa beskrivs i uppsatsen.På basis av resultatet av Vårby-utredningen samt av utförda tester vid LTU, och med ett syfte att minska sannolikheten för liknande sprickbildningar, så har ett antal detaljutformningar utvärderats. Vidare så föreslås en enkel metod för utvärdering av kritisk spänningsvidd i livavstyvningar.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2012. p. 215
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-25959 (URN)bdf20389-c2ab-413d-9e08-9649471058fd (Local ID)978-91-7439-475-7 (ISBN)bdf20389-c2ab-413d-9e08-9649471058fd (Archive number)bdf20389-c2ab-413d-9e08-9649471058fd (OAI)
Presentation
2012-09-24, F1031, Luleå tekniska universitet, Luleå, 10:00
Opponent
Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2023-11-29Bibliographically approved
Collin, P., Nilsson, M. & Veljkovic, M. (Eds.). (2011). International Workshop Strengthening of Steel Bridges: Topics of relevance for the BRIFAG project (ed.). Paper presented at International WorkshopStrengthening of Steel Bridges, Stockholm, Sweden, March 4th, 2010. Luleå: Luleå tekniska universitet
Open this publication in new window or tab >>International Workshop Strengthening of Steel Bridges: Topics of relevance for the BRIFAG project
2011 (English)Conference proceedings (editor) (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2011. p. 324
Series
Technical report / Luleå University of Technology, ISSN 1402-1536
National Category
Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-25044 (URN)d8fc0aac-0ee3-408e-81ed-6e955b9caecf (Local ID)978-91-7439-207-4 (ISBN)d8fc0aac-0ee3-408e-81ed-6e955b9caecf (Archive number)d8fc0aac-0ee3-408e-81ed-6e955b9caecf (OAI)
Conference
International WorkshopStrengthening of Steel Bridges, Stockholm, Sweden, March 4th, 2010
Note

Godkänd; 2011; 20110120 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-09-05Bibliographically approved
Feldmann, M., Naumes, J., Pak, D., Veljkovic, M., Nilsson, M., Eriksen, J., . . . Popa, N. (2010). Economic and durable design of composite bridges with integral abutments (ed.). Luxembourg: European Commission Joint Research Centre
Open this publication in new window or tab >>Economic and durable design of composite bridges with integral abutments
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2010 (English)Report (Refereed)
Abstract [en]

In the design and construction of bridges, questions of sustainability, maintenance and durability are becoming more and more important for European road administrations, in addition to safety and serviceability issues. Therefore integral abutment bridges are becoming highly attractive to designers, constructors and road administrations, as they tend to be less expensive to build, easier to maintain and more economical to own over their life time. Bearings and joints are main sources of maintenance costs during a lifetime. These costs vanish because the bridges are joint- and bearing-free. However, this very advantage complicates the design compared to conventional bridges in some crucial respects. Combined with the fact that most European countries have only limited experience with integral bridges to date, this leads to a reluctance of road administrations to use this bridge type. Thus the main objective of the project is to experimentally and theoretically investigate the behaviour of critical points of integral abutment bridges. Regarding the soil-structure interaction, recommendations are elaborated based on monitoring results as well as previous research and monitoring campaigns. Conventional HP piles and sheet piles are investigated as a foundation. Furthermore a hinged HP connection is developed to decrease the stresses in the pile system. An investigation of the design and construction of the slab to pavement approach is also carried out to avoid major damages to the structure. Finally the most important information is condensed into the essential features in form of a 'Design guide for composite bridges with integral abutments'

Place, publisher, year, edition, pages
Luxembourg: European Commission Joint Research Centre, 2010. p. 140
National Category
Building Technologies Infrastructure Engineering
Research subject
Steel Structures; Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-22818 (URN)10.2777/91014 (DOI)4644c7ab-72bf-41a3-b5e9-10d07be97316 (Local ID)978-92-79-14598-8 (ISBN)4644c7ab-72bf-41a3-b5e9-10d07be97316 (Archive number)4644c7ab-72bf-41a3-b5e9-10d07be97316 (OAI)
Note

Godkänd; 2010; 20120508 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2023-09-05Bibliographically approved
Nilsson, M., Collin, P., Eriksson, K. & James, G. (2010). The instrumentation and monitoring of the Vårby Bridge (ed.). In: (Ed.), Anton Steffen (Ed.), Large structures and infrastructures for environmentally constrained and urbanised areas: IABSE symposium, Venice 2010 ; [34th International Symposium on Bridge and Structural Engineering, Venice, Italy, September 22 - 24, 2010]. Paper presented at International Symposium on Bridge and Structural Engineering : 22/09/2010 - 24/09/2010. : International Association for Bridge and Structural Engineering
Open this publication in new window or tab >>The instrumentation and monitoring of the Vårby Bridge
2010 (Swedish)In: Large structures and infrastructures for environmentally constrained and urbanised areas: IABSE symposium, Venice 2010 ; [34th International Symposium on Bridge and Structural Engineering, Venice, Italy, September 22 - 24, 2010] / [ed] Anton Steffen, International Association for Bridge and Structural Engineering, 2010Conference paper, Published paper (Refereed)
Abstract [en]

Numerous cracks have been discovered in the Vårby Bridge near Stockholm, Sweden. All cracks are found at the junctions between cross girders and the main girders, more specifically, at the welds connecting the vertical web stiffeners to the top flanges of the main girders. In order to identify the reason for the observed cracks, an ongoing investigation under the commision of the bridge owner was started in the spring of 2009. One conclusions so far is that the observed cracks are to 100 % certainty a result of fatigue.FEM-modeling is currently going on as a part of a master thesis. As the fatigue process is distortional the propagation phase of the observed cracks might slow down or even stop. One task will thus be to determine the stress intensity factor versus crack length relationship in order to model a growing crack. Suggestions of possible of methods of refurbishment, based upon the results, will then be presented to the bridge owner.

Place, publisher, year, edition, pages
International Association for Bridge and Structural Engineering, 2010
Series
IABSE Report, ISSN 1025-9104 ; 97
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-38487 (URN)10.2749/222137810796024628 (DOI)ce7a90c6-0c00-4e83-b26b-6941ebcdae74 (Local ID)978-385748-122-2 (ISBN)ce7a90c6-0c00-4e83-b26b-6941ebcdae74 (Archive number)ce7a90c6-0c00-4e83-b26b-6941ebcdae74 (OAI)
Conference
International Symposium on Bridge and Structural Engineering : 22/09/2010 - 24/09/2010
Note
Godkänd; 2010; 20120916 (mattni)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2023-09-06Bibliographically approved
Al-Emrani, M., Lukic, M. & Nilsson, M. (2009). Bridge fatigue guidance: a European research project (ed.). In: (Ed.), Mahāvidyālăy Culālaṅkărṇ (Ed.), Sustainable infrastructure: environment friendly, safe and resource efficient ; proceedings of IABSE symposium, Bangkok, Thailand, Sept. 9 - 11, 2009. Paper presented at IABSE Symposium : 09/09/2009 - 11/09/2009. Zürich: International Association for Bridge and Structural Engineering
Open this publication in new window or tab >>Bridge fatigue guidance: a European research project
2009 (English)In: Sustainable infrastructure: environment friendly, safe and resource efficient ; proceedings of IABSE symposium, Bangkok, Thailand, Sept. 9 - 11, 2009 / [ed] Mahāvidyālăy Culālaṅkărṇ, Zürich: International Association for Bridge and Structural Engineering, 2009Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Zürich: International Association for Bridge and Structural Engineering, 2009
Series
IABSE Report, ISSN 1025-9104 ; 96
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
urn:nbn:se:ltu:diva-37757 (URN)be055f90-e98c-11de-bae5-000ea68e967b (Local ID)978-3-85748-121-5 (ISBN)be055f90-e98c-11de-bae5-000ea68e967b (Archive number)be055f90-e98c-11de-bae5-000ea68e967b (OAI)
Conference
IABSE Symposium : 09/09/2009 - 11/09/2009
Note
Godkänd; 2009; 20091215 (ysko)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Thulstrup, M. B., Nilsson, M., Hällmark, R. & Nielsen, J. P. (2009). Design, fabrication and construction of railway bridge over Södertälje canal (ed.). In: (Ed.), (Ed.), Nordic Steel Construction Conference: Proceedings : September 2.-4., 2009, Malmö, Sweden. Paper presented at Nordic Steel Construction Conference : 02/09/2009 - 04/09/2009 (pp. 128-137). Stockholm: Stålbyggnadsinstitutet
Open this publication in new window or tab >>Design, fabrication and construction of railway bridge over Södertälje canal
2009 (English)In: Nordic Steel Construction Conference: Proceedings : September 2.-4., 2009, Malmö, Sweden, Stockholm: Stålbyggnadsinstitutet , 2009, p. 128-137Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Stockholm: Stålbyggnadsinstitutet, 2009
Series
Publikation / Stålbyggnadsinstitutet - SBI, ISSN 0348-0577 ; 181
National Category
Building Technologies
Research subject
Steel Structures
Identifiers
urn:nbn:se:ltu:diva-35723 (URN)a61df5b0-e98f-11de-bae5-000ea68e967b (Local ID)9789171270580 (ISBN)a61df5b0-e98f-11de-bae5-000ea68e967b (Archive number)a61df5b0-e98f-11de-bae5-000ea68e967b (OAI)
Conference
Nordic Steel Construction Conference : 02/09/2009 - 04/09/2009
Note
Godkänd; 2009; Bibliografisk uppgift: Serie: Sider: ; 20120228 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2023-09-06Bibliographically approved
Collin, P., Möller, M., Nilsson, M. & Törnblom, S. (2009). Undermatching butt welds in high strength steel (ed.). In: (Ed.), Mahāvidyālăy Culālaṅkărṇ (Ed.), Sustainable infrastructure: environment friendly, safe and resource efficient ; proceedings of IABSE symposium, Bangkok, Thailand, Sept. 9 - 11, 2009. Paper presented at IABSE Symposium : 09/09/2009 - 11/09/2009 (pp. 280-281). Zürich: International Association for Bridge and Structural Engineering
Open this publication in new window or tab >>Undermatching butt welds in high strength steel
2009 (English)In: Sustainable infrastructure: environment friendly, safe and resource efficient ; proceedings of IABSE symposium, Bangkok, Thailand, Sept. 9 - 11, 2009 / [ed] Mahāvidyālăy Culālaṅkărṇ, Zürich: International Association for Bridge and Structural Engineering, 2009, p. 280-281Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Zürich: International Association for Bridge and Structural Engineering, 2009
Series
IABSE Report ; 96
National Category
Infrastructure Engineering Building Technologies
Research subject
Structural Engineering; Steel Structures
Identifiers
urn:nbn:se:ltu:diva-37384 (URN)b63f5870-e94a-11de-bae5-000ea68e967b (Local ID)978-3-85748-121-5 (ISBN)b63f5870-e94a-11de-bae5-000ea68e967b (Archive number)b63f5870-e94a-11de-bae5-000ea68e967b (OAI)
Conference
IABSE Symposium : 09/09/2009 - 11/09/2009
Note
Godkänd; 2009; 20091215 (petcol)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2023-09-06Bibliographically approved
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