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  • 101.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Maskinfundament: Beräkning av egensvängningar1984Other (Other academic)
    Abstract [sv]

    En metod presenteras för att beräkna translations- och translationssvängningar för maskinfundament av betong. Metoden illustreras med ett beräkningsexempel.

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  • 102.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Material and structural testing and modelling of concrete1997In: Selected research studies from Scandinavia :: dedicated to professor Göran Fagerlund on his 60th anniversary November 11, 1997, Lund: Lund Institute of Technology, Division of Building Materials , 1997, p. 33-39Chapter in book (Other academic)
  • 103.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Notiser.  Hallå där... om Internationella Broföreningens kongress i Stockholm 20162016In: Cementa, ISSN 0346-8771, no 3, p. 5-Article, book review (Other (popular science, discussion, etc.))
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  • 104.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Plattor av betong1985In: Handboken Bygg: K, Konstruktionsteknik, Stockholm: College of Liberal Arts and Sciences, 1985, p. 153-173Chapter in book (Other (popular science, discussion, etc.))
  • 105.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Praktisk användning av högpresterande betong: Vad kan vi? Vilka möjligheter finns?1999In: Betong, ISSN 1101-9190, no 1, p. 11-13Article in journal (Other (popular science, discussion, etc.))
  • 106.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Projekt: Sveriges Bygguniversitet2012Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    En samverkan mellan de tekniska högskolar i Sverige som utbildar civilingenjörer i samhällsbyggnad / väg- och vattenbyggnad, dvs i första hand Lunds tekniska högskola, LTH, Chalmers tekniska högskola, Kungliga tekniska högskolan, KTH, och Luleå tekniska universitet, LTU)

  • 107.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Pröva allt2007In: Bygga framtid, Vol. 18, no 1, p. 31-Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Vi står inför stora utmaningar ifråga om energi, miljö och klimat och en resa till Kina understryker detta. Kina låg en gång långt före övriga länder men föll sedan tillbaka under flera hundra år för att nu återigen utvecklas mycket kraftigt. - Orsaker till dagens framgångar i Kina och i västerlandet- Viktiga faktorer för att få ett lyckligt liv?- Tack till de som hjälpt att planera och genomföra en Kinaresa i april 2007

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  • 108. Elfgren, Lennart
    Reinforced concrete beams loaded in combined torsion, bending and shear: a study of the ultimate load-carrying capacity1972Doctoral thesis, comprehensive summary (Other academic)
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  • 109.
    Elfgren, Lennart
    Luleå University of Technology.
    Round Robin analyses and tests of anchor bolts in concrete structures: RILEM Technical Committee 90-FMA, Fracture Mechanics of Concrete - Applications1998Collection (editor) (Other academic)
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  • 110.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Round robin analysis and tests anchor bolts1993In: Proceedings: Nordic Concrete Research Meeting : Göteborg 1993, Oslo: Norsk Betongforening , 1993, p. 269-271Conference paper (Refereed)
  • 111.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Round robin analysis and tests of anchor bolts1992In: Fracture mechanics of concrete structures: proceedings of the first International Conference on Fracture Mechanics of Concrete Structures (FraMCoS1) / [ed] Zdenek P. Bazant, Amsterdam: Elsevier, 1992, p. 865-869Conference paper (Refereed)
  • 112.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Round-robin analysis of anchor bolts1990In: Proceedings: Nordic Concrete Research Meeting : Trondheim 1990 / [ed] Jens Jacob Jensen, Oslo: Norsk Betongforening , 1990, p. 272-273Conference paper (Refereed)
  • 113.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Snabbjärnväg till Luleå?: Sänkta byggkostnader på 90-talet1991In: V-byggaren. Upplaga B, ISSN 1653-2422, no 17, p. 6-7Article in journal (Other academic)
  • 114. Elfgren, Lennart
    Studiebesök vid universiteten i Dundee, Edinburgh och Manchester i juni 19701970Report (Other academic)
    Abstract [sv]

    Vridning av betongkonstruktioner, långtidsstabilitet hos betongpelare samt plasticitetsteori för betongramar

  • 115. Elfgren, Lennart
    Studieresa till Tyskland, Schweiz, Italien, Frankrike, Belgien och Holland våren 19691970Report (Other (popular science, discussion, etc.))
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  • 116.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Tekniska Högskolan i Luleå 25 år1996In: Bygga framtid, Vol. 7, p. 4-6Article in journal (Other (popular science, discussion, etc.))
  • 117.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Torsion. Ch. 101989In: Fracture mechanics of concrete structures: from theory to applications, London & New York: Taylor and Francis Group , 1989, p. 238-240Chapter in book (Other academic)
  • 118.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Torsion-bending-shear in concrete beams: a kinematic model1979In: Plasticity in reinforced concrete: final report, Zürich: International Association for Bridge and Structural Engineering, 1979, p. 111-118Conference paper (Refereed)
    Abstract [en]

    A kinematic solution according to the theory of plasticity is presented for reinforced concrete beams loadid in combined torsion, bending and shear.

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  • 119.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Toughness and brittleness of concrete structures1993In: Fiber composites as nonmetallic reinforcement in concrete: a study of possibilities to develop increased ductility in the stress - strain relationship of the reinforcing unit just before tensile failure : seminar, March 15-16, 1993 at Chalmers University of Technology, Göteborg, Sweden / [ed] Ralejs Tepfers, 1993, p. 39-41Conference paper (Refereed)
  • 120.
    Elfgren, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Värmehärdning av betong2001Report (Other (popular science, discussion, etc.))
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  • 121.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Anneling, Roger
    Long-time properties of resin bonded anchors1990In: Proceedings: Nordic Concrete Research Meeting : Trondheim 1990 / [ed] Jens Jacob Jensen, Oslo: Norsk Betongforening , 1990, p. 199-Conference paper (Refereed)
  • 122.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Anneling, Roger
    Eriksson, Anders
    Granlund, Stig-Ola
    Adhesive anchors: tests with cyclic and long-time loads1987Report (Other academic)
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  • 123.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Apleberger, Lennart
    High performance concrete structures: design examples & properties2000Collection (editor) (Other academic)
    Abstract [en]

    The report presents examples of design calculations for high performance concrete structures. It also summarizes some of the test results and material properties in a Swedish Research Program on High Performance Concrete. The aim is to give a background to and propose characteristic material properties to be used in design of high strength concrete.

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  • 124.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Apleberger, Lennart
    High performance concrete structures: design handbook2000Collection (editor) (Other academic)
  • 125.
    Elfgren, Lennart
    et al.
    Luleå University of Technology.
    Axelsson, Kenneth
    Luleå University of Technology. Uppsala Universitet.
    Fröier, Mats
    Luleå University of Technology. Ericsson Microwave, Mölndal.
    Plattor och Skal1988Report (Other academic)
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  • 126.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Bagge, Niklas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilimaa, Jonny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Blanksvärd, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Shu, Jiangpeng
    Chalmers University of Technology.
    Plos, Mario
    Chalmers University of Technology, Department of Civil and Environmental Engineering , Chalmers University of Technology.
    Larsson, Oskar
    Faculty of Engineering, LTH, Department of Constructional Sciences, Lund University.
    Sundquist, Håkan
    Kungliga tekniska högskolan, KTH, KTH, Structural Engineering & Bridges.
    Brottbelastning av en 55 år gammal spännbetongbro i Kiruna - Kalibrering av modeller för tillståndsbedömning: Slutrapport till BBT2015Report (Refereed)
    Abstract [sv]

    En 55 år gammal spännbetongbro med fem spann med längden 121,5 m har provats till brott för att studera och kalibrera metoder för tillståndsbedömning av befintliga broar. Projektet harbidragit till att ge svar på flera av de frågor som ställs beträffande hållbart byggande och uppföljning av befintliga konstruktioner inom BBT - Branschprogram för forskning och innovation avseende byggnadsverk inom transportsektorn. Framför allt adresseras följande områden:A.2.1 Säkerhet, robusthet och sårbarhet – En betydande robusthet finns i den studerade typen av broar och säkerheten mot brott är större än den som erhålls med modellerna i de europeiska betongnormerna.A.2.4 Metodik för individuell bärighetsklassning av broar – En kombination av FE-modellering och analytiska studier baserade på verklig geometri och aktuella materialdata har goda förutsättningar att kunna ge betydligt mer kvalificerade bedömningar av kvarvarande bärförmåga än nu tillämpade metoder.A.2.5 Beständighet och livslängd hos nya byggnadsverk – Projektet ger underlag för förbättrade metoder att bestämma beständighet och livslängd hos spännbetongbroar.A.3.1 Mätmetoder – I projektet har en ny metod för fotografisk töjningsmätning provats. Resultaten har ännu inte hunnit helt utvärderas men de ser lovande ut.A.3.2 Bedömning av tillstånd och livslängd – Projektet ger underlag för förbättrade metoder för bedömning av tillstånd och livslängd.Projektet har hittills redovisats i en doktors- och en licentiatavhandling och i tio tidskrifts- och konferensartiklar.

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  • 127.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Bell, Brian
    UIC, Network Rail, London.
    Nilimaa, Jonny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Häggström, Jens
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Tu, Yongming
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering. College of Civil Engineering, Southeast University, Nanjing.
    Lundgren, Karin
    Chalmers University of Technology, Department of Civil and Environmental Engineering.
    Plos, Mario
    Chalmers University of Technology, Department of Civil and Environmental Engineering.
    Larsson, Oskar
    Faculty of Engineering, LTH, Department of Constructional Sciences, Lund University.
    Casas, Joan Ramon
    Universitat Politècnica de Catalunya.
    New technologies to extend the life of elderly rail infrastructure: Deliverable 1.3 in MAINLINE - a project within the EC 7th Framework Programme2015Report (Refereed)
    Abstract [en]

    There are many traditional technologies available to extend the life of elderly rail infrastructure, some of which are being improved or developed, whilst new technologies continue to emerge.In two earlier reports a benchmark of new technologies was given and assessment methods were presented, ML-D1.1 (2013) and ML-D1.2 (2013). In this report, ML-D1.3, an overview is given of some of the most promising new or updated technologies. Based on the findings, work in the Mainline project has focused on the following two areas for bridges, tunnels and track:- Assessment methods- Repair and Strengthening methodsSome of the methods are still under development and may not yet be available commercially. Hence these are presented on a “for information” basis and as something that may be introduced on a broader scale in a near future.In the report assessment and strengthening of bridges are treated in Chapter 4 and Chapter 5.Tunnels are treated in Chapter 6 and track and earthwork in Chapter 7.The report also includes with five appendices with details of important work that has been donein the MAINLINE project. Appendix A presents results from the assessment and full scale testing to failure of a 50 year old metallic truss bridge. Appendix B presents results from the strengthening by post-tensioning of a concrete trough bridge. Appendix C presents methods to extend life for tunnels. Appendix D proposes methods for the assessment of fatigue andAppendix E, finally, gives a fairly comprehensive list of references on how to extend the life of structures.A Guideline for application of the new technologies is given in ML-D1.4 (2014).

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  • 128.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Bernander, Stig
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Knutsson, Sven (Author of introduction, etc.)
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
    Response to and Comments on “Geotechnical Peer Review of Dr. S. Bernander’s Reports and Analysis of the North Spur”2018Report (Other academic)
    Abstract [en]

    The concerns regarding the stability of the North Spur can be summarized in three points:

    (1) None of the most critical inclined failure surfaces have been studied by Muskrat Falls Corporation. These failure surfaces may be initiated on the upstream side of the dam containment. Here the effects of the deformations, caused by the pressure of the rising water level, have to be resisted by the metastable soil layers in the North Spur. A local failure may occur progressing downwards towards the downstream side of the Spur. A catastrophic dam breach would follow. The GPRP further categorically overlooks the fact that horizontal failure planes cannot possibly represent the highest risk of instability irrespective of whether the analysis is based on the Limit Equilibrium Mode (LEM) or on the Progressive Failure Mode.

    (2) The stress/strain deformation properties of the porous soils in the North Spur have not been made available. Only strength properties, related to fully drained conditions, have been given. How stresses relate to simultaneous deformations under undrained (or partially undrained) conditions have not been defined in any way. Such relationships are crucially essential for any up-to-date analysis of slope stability.

    (3) A high risk of North Spur instability has been found related to impoundment.  A series of investigatory calculations have been made, based on deformation properties from similar landslides and on a wide variety of assumed input data for possible critical failure surfaces. The results of these analyses indicated a safety factor far below 1.

    The peer review does not address the above three points. It gives a good view of the general conditions but also contains misconceptions, erroneous considerations and refutable comments indicating that the earlier reports by Bernander have not been fully understood by the panel members.

    As no up-to-date analysis of the stability of the North Spur has been provided, our conclusion is that an independent group of experts, appointed by government, should be entrusted with this important task.

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  • 129.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Bernander, Stig
    Emborg, Mats
    Gabrielsson, Henrik
    Groth, Patrik
    Luleå University of Technology.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Jonasson, Jan-Erik
    Nilsson, Martin
    Noghabai, Keivan
    Ronin, Vladimir
    Westman, Gustaf
    Design of high performance concrete structures: a Swedish design handbook1999In: Utilization of high strength/high performance concrete: proceedings : symposium in Sandefjord, Norway 20-24 June 1999 / [ed] Ivar Holand; Erik J. Sellevold, Oslo: Norsk Betongforening , 1999, p. 232-242Conference paper (Refereed)
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  • 130.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Blanksvärd, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Nilimaa, Jonny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Project: Mainline-MAINtenance, renewaL and Improvement of rail transport iNfrastructure to reduce Economic and environmental impacts2012Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    - Apply new technologies to extend the life of elderly infrastructure - Improve degradation and structural models to develop more realistic life cycle cost and safety models - Investigate new construction methods for the replacement of obsolete infrastructure- Investigate monitoring techniques to complement or replace existing examination techniques -Develop management tools to assess whole life environmental and economic impact.

  • 131.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Blanksvärd, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering. Skanska Sverige AB Technology, Bridge and Civil Engineering.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering. STO Scandinavia AB.
    Casas, Joan R
    Universitat Politècnica de Catalunya.
    Bell, Brian
    UIC, International Federation of Railways, Paris, Network Rail, London.
    Lundgren, Karin
    Chalmers University of Technology, Department of Civil and Environmental Engineering.
    Guideline for application of new technologies to extend life of elderly rail infrastructure: Deliverable 1.4 in MAINLINE - a project within EC 7tf Framework Programme2015Report (Other (popular science, discussion, etc.))
    Abstract [en]

    There are many traditional technologies available to extend the life of elderly rail infrastructure, some of which are being improved or developed, whilst new technologiescontinue to emerge. In this guideline some of the most promising new or updated technologies are presented forbridges, track and earthwork regarding: - Assessment methods- Repair and Strengthening methodsIn an Appendix strengthening methods are presented in more detail with examples of designcalculations and work carried out.The guideline is based on work presented in earlier reports in MAINLINE: ML-D1.1 (2013):Benchmark of new technologies to extend the life of elderly rail infrastructure, ML-D1.2(2013): Assessment methods for elderly rail infrastructure and ML-D1.3 (2014): Newtechnologies to extend the life of elderly infrastructure; In these reports, backgroundinformation and more references can also be found.

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  • 132.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Cederwall, Krister
    Gylltoft, Kent
    Broms, Carl Erik
    Fatigue of anchor bolts in reinforced concrete foundations1982In: Fatigue of Steel and Concrete Structures: proceedings, Zürich: International Association for Bridge and Structural Engineering, 1982, p. 463-470Conference paper (Refereed)
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  • 133.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Danielsson, Georg
    Holm, Ingvar
    Söderlind, Gunnar
    Long time load-carrying capacity of bonded anchors2001In: Connections between steel and concete / [ed] R. Eligehausen, Cachan (Val-de-Marne): Rilem publications, 2001, p. 391-401Conference paper (Refereed)
  • 134.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Eligehausen, R
    Institut für Werkstoffe in Bauwesen, Universität Stuttgart.
    Rots, J.G.
    Faculty of Architectun, Delft University of Technology.
    Anchor bolts in concrete structures: summary of round robin tests and analysis arranged by RILEM TC 90-FMA ‘Fracture Mechanics of Concrete-Applications’2001In: Materials and Structures, ISSN 1359-5997, E-ISSN 1871-6873, Vol. 34, no 8, p. 451-457Article in journal (Refereed)
    Abstract [en]

    Results are presented from a RILEM Round Robin Investigation on tests and analyses of anchor bolts in concrete. About 60 researchers have performed more than 180 tests and 200 analyses in America, Asia, Australia and Europe. The investigation shows that it is possible to reasonably correctly analyse both plane and axi-symmetric anchor bolt problems. However, there are difficulties to overcome and correct boundary conditions are important both in analyses and tests.

  • 135.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Emborg, Mats
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Elsa och Sven Thysells Stiftelse för konstruktionsteknisk forskning inom väg och vatten vid Luleå tekniska universitet: En skrift tillägnad Donator Sven Thysell på 100-årsdagen 2016-09-022016Report (Other (popular science, discussion, etc.))
    Abstract [sv]

    Denna skrift ger en kort beskrivning av Elsa och Sven Thysells stiftelse för konstruktionsteknisk forskning inom väg- och vatten vid Luleå tekniska universitet. Skriften har sammanställts inför donator Sven Thysells 100-årsdag den 2 september 2016. Vi är mycket tacksamma för det stöd Stiftelsen har gett och ger till konstruktionsteknisk forskning vid LTU. Stödet betyder mycket för att vår verksamhet skall kunna utvecklas till nytta för samhället

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  • 136. Elfgren, Lennart
    et al.
    Emborg, Mats
    Gabrielsson, Henrik
    Groth, Patrik
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Jonasson, Jan-Erik
    Noghabai, Keivan
    Olofsson, Thomas
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Westman, Gustaf
    Design of high performance concrete structures in Sweden1998In: International Symposium on High-Performance and Reactive Powder Concretes: organized by Université de Sherbrooke / [ed] Pierre-Claude Aïtcin; Yves Delagrave, Sherbrooke, Que: University of Sherbrooke , 1998, p. 139-156Conference paper (Refereed)
  • 137.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Enochsson, Ola
    Tvärkraft och vridmoment i betongkonstruktioner2007In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, Vol. 99, no 7, p. 40-43Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    I artikeln diskuteras hur ett vridmoment kan omvandlas till analoga tvärkrafter vid dimensiobnering av betongkonstruktioner enligt de nya europeiska betongnormerna Udgivelsesdato: October

  • 138.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Enochsson, Ola
    Olofsson, Jan
    Skanska Teknik, Göteborg.
    Hedlund, Hans
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Paulsson, Björn
    Banverket, Borlänge.
    Kieksi, Katarina
    Banverket, Borlänge.
    Tillståndsbedömning av betongbroar2006In: Bygg och Teknik, ISSN 0281-658X, E-ISSN 2002-8350, Vol. 98, no 7, p. 35-40Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    En vanlig frågeställning för befintliga broar är deras tillstånd: Har bärförmågan minskat med tiden så att bron behöver repareras eller förstärkas? Eller, är det rentav så att man med bättre beräkningsmetoder kan visa att en bro idag klarar att bära en högre last än den som den ursprungligen dimensionerades för?

  • 139.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Enochsson, Ola
    Puurula, Arto
    Tillståndsbedömning av broar2009In: Bygga framtid, Vol. 20, p. 11-15Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    En vanlig fråga för en broförvaltare är: Har brons bärförmåga minskat med tiden så att den behöver repareras eller förstärkas? Eller, är det rentav så att man med bättre beräkningsmetoder kan visa att bron idag klarar att bära en högre last än den, som den ursprungligen dimensionerades för? Udgivelsesdato: 2009

  • 140.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Enochsson, Ola
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Puurula, Arto
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Nilimaa, Jonny
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Töyrä, Björn
    Trafikverket.
    Preliminary Assessment of Finnish Railway Bridges: Railway Infrastructure Upgrading with Increase of Axle loads from 25 to 30 tonnes on the Line Tornio - Kolari, A Comparison with Swedish Railway Bridges on the Lines Luleå - Narvik and Haparanda - Boden2009Report (Other academic)
    Abstract [en]

    Some 60 bridges on the Finnish Railway Line between Tornio and Kolari have been assessed in a preliminary way. The study is based on experiences on the two neighbouring Swedish Railway Lines Malmbanan and Haparandabanan.

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  • 141.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Enochsson, Ola
    Puurula, Arto
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Thun, Håkan
    Trafikverket.
    Field Test of a Concrete Bridge in Örnsköldsvik, Sweden: SB-7.3 Sustainable Bridges2008Report (Refereed)
    Abstract [en]

    Background - In the project Sustainable Bridges (www.sustainblebridges.net) important objectives are to increase the transport capacity and service life of existing bridges. In order to demonstrate new and refined methods developed in the program, field tests of existing bridges were carried out in Work Package 7. One of the bridges which have been tested is a 50 year old two-span concrete bridge located in Örnsköldsvik in northern Sweden.Due to time, legal and cost restraints, concrete bridges are seldom tested to failure. It was therefore deemed vital to carry out such a test here, as it is the only way to check if applied analytical and numerical models do catch the essential behaviour at failure of a structure.Objective - The Örnsköldsvik reinforced concrete bridge was loaded to failure to test new and refined methods developed in the project regarding procedures for inspection and condition assessment (WP 3), load carrying capacity in combined shear, torsion and bending (WP 4), monitoring (WP5), and strengthening (WP 6).To achieve a shear failure and to avoid an uninteresting bending failure, the bottom slab was strengthened before the final test. Near Surface Mounted Reinforcement (NSMR) was used consisting of Carbon Fibre Reinforced Polymers (CFRP).Results – The Bridge has two spans of 12 m. A loading beam made of steel was placed in the centre of one of the spans. The loading beam was then pulled down with cables injected to the bedrock beneath the bridge.The methods developed in the Sustainable Bridges program showed to be reliable. The inspection and condition assessment indicated that bridge was in good condition with almost no reinforcement corrosion. This was shown to be true. Material tests gave important contributions to steel and concrete properties. The load carrying capacity was underestimated with Swedish and European Codes, BBK04 and EN1992-2. combined with linear elastic finite element calculations. Better results were obtained with non-linear methods as the Modified Compression Field Theory (MCFT) and the non-linear finite element program Atena, recommended by the Guideline SB-LRA (2007) produced in the project. The monitoring methods used for concrete and steel strains, crack initiation, deflections and damage detection worked well. The strengthening method also worked very well. The bridge could carry a load of 11,7MN which was 20 to 50 % more than predictions based on BBK04 and EN 1992-2.The failure test showed that the bridge without strengthening managed to carry not only one train, as it was designed to do, but eight trains on top of each other with an axle load of 250 kN. With strengthening it could carry 11 trains. This shows that concrete railway bridges might have a considerable reserve of extra load-bearing capacity.

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  • 142.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Enochsson, Ola
    Puurula, Arto
    Thun, Håkan
    Paulsson, Björn
    Täljsten, Björn
    Testing to failure of a reinforced concrete railway trough bridge in Örnsköldsvik, Sweden2007In: Sustainable bridges: assessment for future traffic demands and longer lives / [ed] Jan Bien; Lennart Elfgren; Jan Olofsson, Wrocław: Dolnoslaskie Wydawnictwo Edukacyjne , 2007, p. 445-460Conference paper (Refereed)
  • 143.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Enochsson, Ola
    Täljsten, Björn
    Paulsson, Björn
    Banverket.
    Sustainable railway bridges with higher axle loads: monitoring examples from northern Sweden2007In: High Tech in Heavy Haul: Proceedings. International Heavy Haul Conference. Specialist Technical Session / [ed] Thomas Nordmark; Per-Olof Larsson-Kråik, Luleå: Luleå tekniska universitet, 2007, p. 159-166Conference paper (Refereed)
    Abstract [en]

    Monitoring of several railway bridges has been carried out in northern Sweden in order to increase the allowable axle load. The work is part of a European Integrated Project "Sustainable Bridges - Assessment for Future Traffic Demands and Longer Lives". The paper describes the project and gives some examples of applications.

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    FULLTEXT01
  • 144.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Enochsson, Ola
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Thun, Håkan
    Project: Sustainable Bridges2013Other (Other (popular science, discussion, etc.))
    Abstract [sv]

    Ett EU-projekt med avsikt att förlänga livlängden för befinmtliga järnvägsbroar

  • 145.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Fagerlund, G.
    Skarendahl, Å.
    Swedish R&D Program on High Performance Concrete1995In: International Workshop on High Performance Concrete / [ed] P. Zia, American Concrete Institute, 1995, Vol. SP-159, p. 247-261Conference paper (Refereed)
  • 146.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Fransson, Lennart
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Täljsten, Björn
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering. Skanska Teknik AB.
    Infrastructure in NW Russia - Potential development: A Pre-feasibility Study with Special Reference to Winter Transportation, Concrete Structures, and Timber Structures 2000Report (Other academic)
    Abstract [en]

    In co-operation with a Finnish Group of researchers a pre-feasibility study was undertaken regarding potential development of the Infrastructure in NW Russia. Special emphasis was given: Winter Transportation and Reinforcement of Load Bearing Ice Covers; Concrete Construction and Strengthening of Concrete Structures; Timber Construction and Mechanical Wood Industry Development; and Energy Conservation and Industrial Energy Development.

    Based on the study three Russian-Swedish co-operation projects have started:

    - Load Bearing Ice Covers (Literature Survey)

    - Forces caused by Ice Crushing against Off-Shore Structures (EC funded Research Project)

    - Strengthening of a Bridge. Co-operation Stabilator/Skanska - Arkhangelsk Road

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  • 147. Elfgren, Lennart
    et al.
    Fröier, Mats
    Ericsson Microsoft.
    Deformationer och spänningar i Älvsborgsbrons södra betongtorn: Mätmetoder jämte resultat erhållna under byggnadstiden. Examensarbete i Byggnadsstatik 1964-651967Report (Other academic)
    Abstract [sv]

    I syfte att kontrollera att tillåtna spänningar ej överskrids i tornbenen på Älvsborgsbron har deformationsmätningar företagits med mekanisk extensometer och med elektromagnetisk töjningsgivare (trådfrekvensgivare). Mätmetoderna beskrivs och mätresultat redovisas för det södra tornet under vinterhalvåret 1964-65. De erhållna resultaten jämförs med teoretiskt beräknade spänningar och deformationer. Inverkan av krympning, krypning och temperatur diskuteras. En redogörelse lämnas för trådfrekvensmätningar på två andra byggnadsverk. Rekommendationer ges för hur mätningar enligt de behandlade metoderna bör organiseras med hänsyn till vunna erfarenheter.

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    fulltext
  • 148.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.
    Grennberg, Torsten
    Luleå University of Technology.
    Horrigmoe, Geir
    Luleå University of Technology.
    Axelsson, Kennet B. E.
    Luleå University of Technology.
    Johansson, Bernt
    Institutionen för Anläggningsteknik. Verksamhetsberättelse 1986/871987Report (Other (popular science, discussion, etc.))
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  • 149.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Grip, Niklas
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Ohlsson, Ulf
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Sabourova, Natalia
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Signal processing in modal analysis of bridges2009Conference paper (Other academic)
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  • 150.
    Elfgren, Lennart
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Construction Engineering.
    Grzybowski, Miroslaw
    Uppsprickning av betongkonstruktioner på grund av vridning2000Report (Other academic)
    Abstract [sv]

    Rapporten behandlar uppsprickning och bärighet för betongkonstruktioner utsatta för vridande moment. Teoretiska modeller baserade på elasticitetsteori, plasticitetsteori och brottmekanik jämförs med de regler som finns i de svenska betongbestämmelserna BBK 94. Speciellt behandlas frågan när ett vridande moment kan försummas. Rekommendationer ges beträffande modifieringar av BBK:s regler för (a) sprickbildning på grund av vridning med hänsyn till förspänning och (b) begränsning av tvärsnittsutformningen (sidoförhållandet kan under vissa omständigheter kan ökas från <3 till <5).

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