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  • 151. Carlswärd, Jonas
    et al.
    Emborg, Mats
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Olofsson, Thomas
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Shrinkage cracking of steel fiber reinforced self compacting concrete overlays: test methods and theoretical modelling2007Inngår i: Proceedings of the 5th International Rilem Symposium on Self-Compcting Concrete: SCC2007 / [ed] G. De Schutter ; G. De Schutter . Boel, Bagneux, France: Magnel Laboratory for Concrete Research, Ghent University , 2007, s. 793-798Konferansepaper (Fagfellevurdert)
  • 152.
    Carolin, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser.
    Carbon fibre reinforced polymers for strengthening of structural elements2003Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    There is a large need for strengthening of concrete structures all around the world. There can be many reasons for strengthening, increased loads, design and construction faults, change of structural system, and so on. The need exists for both strengthening in flexure as well as in shear. Plate bonding with Carbon Fibre Reinforced Polymers, CFRPs has shown to be a competitive method for upgrading existing structures load bearing capacity. When applying composites for increased shear capacity, special concerns need to be taken for design with truss model. A limitation factor of approximately 0.6 must be used due to linear elastic behaviour. When limitation on maximum strain in concrete is applies, the allowable strain in the composite will be even lower due to anisotropy and divergence in fibre and principal strain direction. By bonding CFRP to a structure in sawn grooves some advantages compared to traditional plate bonding may be achieved. It is also found that a structure may be strengthened with live loads during strengthening process. CFRP plate bonding may further be used for strengthening for increased buckling load bearing capacity for steel members subjected to compression and a design proposal is presented. Suggestions for further research are identified and presented.

  • 153. Carolin, Anders
    Improvement of the load-bearing capacity of existing bridges: a review of literature1999Rapport (Annet vitenskapelig)
    Abstract [en]

    Improvement of load-bearing capacity of bridges is a large subject. Many methods have been developed for strengthening and for increasing the bearing capacity. Two examples are the use of post-tensioning reinforcement and externally bonded carbon fibre products. There is an accelerated increase in the number of objects being strengthened. Especially the method by bonding of carbon fibre is a fast growing technique.

  • 154. Carolin, Anders
    Monitoring of a rail road bridge strengthened with CFRP1999Inngår i: Proceedings: nordic concrete research meeting : Reykjavik, Iceland 1999, Oslo: Norsk Betongforening , 1999Konferansepaper (Fagfellevurdert)
  • 155.
    Carolin, Anders
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser.
    Strengthening of concrete structures with CFRP: shear strengthening and full scale applications2001Licentiatavhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    Structures can be in need of strengtheing due to many reasons, which are presented in this thesis. A literature review gives the existing methods for enhancing a structures load bearing capacity. In this thesis focus will be set at external bonding with carbon fibre reinforced polymers. A theory for shear strengthing is presented and compared to laboratory test. Full-scale applications with measurements are evaluated and presented. Finally, some topics for further research are given.

  • 156.
    Carolin, Anders
    et al.
    Trafikverket, Luleå.
    Anderson, Robert
    Network Rail, London, United Kingdom.
    Heissenberger, Roman
    ÖBB, Wien, Austria.
    Hermosilla Carrasco, Carlos
    Acciona Technology, Madrid, Spain.
    Schewe, Britta
    Deutsche Bahn, Berlin, Germany.
    Nilimaa, jonny
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Blanksvärd, Thomas
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Täljsten, Björn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Cwircen, Andrzej
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Elfgren, Lennart
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Innovative Intelligent Management of Railway Bridges, In2Rail: A European Horizon 2020 Project2016Inngår i: IABSE CONGRESS, STOCKHOLM, 2016: Challenges in Design and Construction of an Innovativeand Sustainable Built Environment / [ed] Lennart Elfgren, Johan Jonsson, Mats Karlsson, Lahja Rydberg-Forssbeck and Britt Sigfrid, CH - 8093 Zürich, Switzerland, 2016, s. 2552-2561Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Innovative Intelligent Railways, In2Rail, is a European Horizon 2020 Project with the objective to enhance capacity, increase reliability and reduce Life Cycle Costs of European Railways. Bridges and Tunnels is the main focus in Work Package 4. The aim is to study, benchmark and further develop new Inspection Technologies in order to create more proactive maintenance procedures. In this paper some preliminary results are presented.

  • 157.
    Carolin, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser.
    Elfgren, Lennart
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Load-carrying capacity of concrete structures loaded in shear and torsion2002Rapport (Annet vitenskapelig)
    Abstract [en]

    The report is a state-of-the-art-report about load-carrying capacity in shear and torsion for concrete members.

  • 158. Carolin, Anders
    et al.
    Nordin, Håkan
    Täljsten, Björn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Concrete beams strengthened with near surface mounted reinforcement of CFRP2001Inngår i: FRP Composites in Civil Engineering: Proceedings of the International Conference on FRP Composites in Civil Engineering, Amsterdam: Elsevier, 2001, Vol. 2, s. 1059-1066Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The size of loads wearing on the railroad and highway systems have increased in recent years. For concrete structures with a very long life and also under difficult conditions, it is not uncommon that measures must be taken to improve the structure's durability or its load bearing capacity. Recently, the use of advanced composites in external bonding of extra reinforcement has become an accepted method. However, there are some drawbacks to this method, including that the pretreatment of the concrete surface is highly work intensive and time consuming, as well as quality concerns. With the improved plate bonding presented in this paper, the aforementioned problems are less troublesome. The technique has also been tested with a cementitious bonding agent.

  • 159. Carolin, Anders
    et al.
    Täljsten, Björn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Experimental study of strengthening for increased shear bearing capacity2005Inngår i: Journal of composites for construction, ISSN 1090-0268, E-ISSN 1943-5614, Vol. 9, nr 6, s. 488-496Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The need for structural rehabilitation of concrete structures all over the world is well known, and a great amount of research is going on in this field. The use of carbon fiber-reinforced polymer (CFRP) plate bonding has been shown to be a competitive method with regard to both structural performance and economic factors. This method consists of bonding a thin carbon-fiber laminate or sheet to the surface of the structure to act as an outer reinforcement layer. However, most research in this area has been undertaken to study flexural behavior. This paper deals with shear strengthening of reinforced concrete members by use of CFRP. Tests on rectangular beams 3.5 to 4.5 m long have been undertaken to study different parameters, such as fatigue, anchorage, and others. The strain field in shear spans of beams simultaneously subjected to shear and bending is also studied. The tests presented also contribute to the existing literature on tests of concrete members strengthened for increased shear capacity.

  • 160. Carolin, Anders
    et al.
    Täljsten, Björn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Probabilistic design of FRP strengthening of concrete structures2008Inngår i: High Performance Structures and Materials IV: [proceedings of the Fourth International Conference on High Performance Structures and Materials (HPSM), which was held in the Algarve, Portugal, in May 2008] / [ed] W.P. De Wilde; C.A. Brebbia, Southampton: WIT Press, 2008, s. 481-489Konferansepaper (Fagfellevurdert)
    Abstract [en]

    For a long period of time CFRP plate bonding has been shown to be a competitive method for shear strengthening, both in regards to structural performance and economical aspects. A handful of models for design that include different strengthening aspects exist. Most proposals are derived from assumptions made for the design of new structures and are also based on a deterministic approach where in the best cases a safety factor is added. The use of probabilistic methods is extending and reliability of a designed structure is sometimes calculated. This paper presents how the reliability should be used in the design for strengthening an existing structure, which issues should be considered and also what safety one can expect from a structure strengthened in shear. Partial coefficients on material properties and loads are used to give a uniform treatment of the risk of failure. When partial coefficients are chosen, the reason for strengthening and the strengthening method may be considered to achieve an optimal strengthening with respect to structural safety and economy. The results from the analysis indicate design models for shear strengthening should be analytically determined with a transparent strategy for the uniform treatment of reliability aspects.

  • 161. Carolin, Anders
    et al.
    Täljsten, Björn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Strengthening of a concrete railroad bridge with carbon fibre sheets1999Inngår i: Structural faults + repair-99: 8th international conference, London, UK, 13 - 15 July 1999 / [ed] M. C. Forde, Edinburgh: Engineering Technics Press , 1999Konferansepaper (Fagfellevurdert)
  • 162. Carolin, Anders
    et al.
    Täljsten, Björn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Theoretical study of strengthening for increased shear bearing capacity2005Inngår i: Journal of composites for construction, ISSN 1090-0268, E-ISSN 1943-5614, Vol. 9, nr 6, s. 497-506Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In recent years, the use of carbon fiber reinforced polymer (CFRP) has been shown to be a competitive method for strengthening both the structural and economic performance of concrete. The method has been used for almost a decade, yet – most research undertaken has studied the flexural behavior of strengthened structures, while research on shear strengthening has been limited. The work presented in this paper focuses on CFRP shear strengthening of concrete beams. The theory presented addresses the limitations of the widely used truss model, and a refinement is suggested. A reduction factor to consider the nonuniform strain distribution over the cross section is proposed and strain limitations are prescribed for the principal strain in the concrete instead of the fiber strain, as in previous studies. The derived analytical model is compared to experimental data from tests. Fairly good agreement is found between results from tests and calculated values from theory with regard to both shear-bearing capacity and average fiber utilization.

  • 163. Carolin, Anders
    et al.
    Täljsten, Björn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Undersökning av friktionsförband i trä genom förspända kolfiberbultar2006Rapport (Annet vitenskapelig)
    Abstract [sv]

    Vasaskeppet bärgades 1961 och är unik i storlek och skick. Av flera anledningar önskas befintliga stålbultar, vilka utgör en del av befintligt förband i skeppet, ersättas. En möjlighet är att ersätta befintliga bultar med bultar av kolfiberkomposit. I denna rapport redovisas resultat från försök där möjligheten till att använda kolfiberbultar för Vasas sammanfogning studerats. Två olika bultsystem har undersökts utifrån lämplighet med avseende på bärförmåga, handhavande samt flexibilitet. Försöksuppställning har utformats utifrån tänkt verkningssätt i skeppet. Ett av bultsystemet har bedömts lämpligare varför utökad provning genomförts på detta system. Laboratorieförsöken visar på att det är fullt möjligt att ersätta stålbultarna i Vasaskeppet med bultar av kolfiberkomposit.

  • 164. Carolin, Anders
    et al.
    Täljsten, Björn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Hejll, Arvid
    Concrete beams exposed to live loading during carbon fiber reinforced polymer strengthening2005Inngår i: Journal of composites for construction, ISSN 1090-0268, E-ISSN 1943-5614, Vol. 9, nr 2, s. 178-186Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The need for structural rehabilitation of concrete structures all over the world is well known. Extensive amounts of research have been carried out and are ongoing in this field. Most of the laboratory research has been undertaken on structural elements without live load during the strengthening process. Normally owners of structures want to continue their activity or service during strengthening. Full-scale applications have shown that this is possible, but there is a lack of understanding as to how cyclic loads are distributed during strengthening; for example, traffic loads affect the final strengthening result. This paper presents laboratory tests on concrete beams strengthened with carbon fiber-reinforced polymer laminates and near-surface mounted reinforcement. The beams were subjected to a cyclic load during setting of the adhesive, and after additional hardening were then loaded by deformation control up to failure.

  • 165.
    Carolin, Anders
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser.
    Täljsten, Björn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Nilsson, Martin
    Enochsson, Ola
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Fahleson, Claes
    Tillförlitlighetsanalys för reparerade eller förstärkta byggnadskonstruktioner2004Rapport (Annet vitenskapelig)
    Abstract [sv]

    I rapporten visas på möjligheterna med att använda tillförlitlighetsanalys på byggnadskonstruktioner som förstärks. I det stora fokuseras på betongkonstruktioner och särskilt diskuteras förstärkning av betongkonstruktioner med hjälp av utanpåliggande kolfiberkompositmaterial. Förstudien visar att tillförlitlighetsanalys i generella termer kan vara mycket användbart när det gäller att studera bärförmågan samt vilken konsekvens detta har för den befintliga konstruktionen, speciellt tydligt blir detta när det kopplas till verkliga objekt. Utöver detta visar studien på möjligheter att på ett mer nyanserat sätt förstärka konstruktioner där tillförlitlighetsanalys är ett viktigt verktyg. Studien visar också på behov av fortsatt forskning, speciellt tydligt är detta när det gäller vilka värden samt vilka partialkoefficienter man ska välja för de nya materialen som börjar användas, dvs. för kompositmaterial. I tillägg till detta behöver en nyanserad studie göras gällande de beräkningsmodeller som används i samband med förstärkning och även avseende på de brottmoder som kan uppstå.

  • 166. Carolin, Anders
    et al.
    Täljsten, Björn
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Åström, Lars
    Konstruktionsprovning av stålrör2003Rapport (Annet vitenskapelig)
    Abstract [sv]

    Under 2002 och 2003 genomfördes vid Luleå tekniska universitet, Avdelningen för Konstruktionsteknik en studie av stålrör uppstyvade med kol-, aramid- respektive glasfiberkomposit för att på så sätt öka knäcklasten. De metoder som användes var handuppläggning samt montage av förtillverkade skal tillverkade genom vakuuminjicering. Totalt provades nio stålrör vardera med längden 3.800 mm och diameter 88,9 mm. Ett rör lämnades oförstärkt och användes som referens. Resultatet från provningen visade att det var möjligt att öka knäcklasten genom att använda metoden med utanpåliggande fiberkomposit. I samband med undersökningen har även en analytisk och numerisk modellering av försöken gjorts. Denna stämmer bra överens med försöken. Förutom försök i laboratorium och teoretiska analyser utfördes en praktisk studie om gällande möjligheten att förstärka stålrör i fält. Denna undersökning gjordes hos Spännarmering AB i Upplands Väsby. Det visade sig att metoden med förtillverkade rör var att föredra framför handuppläggning. Dock bör speciella verktyg tas fram för att applicera lim på en mast i fält.

  • 167.
    Casas, Joan Ramon
    et al.
    Universitat Politècnica de Catalunya, Barcelona, Spain.
    Bien, Jan
    Wroclaw University of Technology, Poland.
    Updated inventory on condition assessment procedures for bridges: Sustainble Bridges SB D3.2- Including an Appendix on Methods of railway bridge testing and evaluation in Poland2007Rapport (Fagfellevurdert)
    Abstract [en]

    The objectives are:

    1.- To set the definitions, objectives and phases included in the condition assessment process

    2.- To examine and review the existing procedures used for the condition assessment of railway bridges in twelve selected european countries 

    3.- To create the necessary knowledge to develop a future expert system for bridge condition evaluation that may be assumed, understood and incorporated by the different european countries

  • 168.
    Casas, Joan Ramon
    et al.
    Universitat Politècnica de Catalunya, Barcelona, Spain.
    Cremona, Christian
    Laboratoire Central des Ponts et Chaussées, Paris, France.
    Holm, Göran
    Swedish Geotechnical Institute, SGI, Lindköping, Sweden.
    Karoumi, Raid
    Royal Institute of Technology, KTH, Stockholm, Sweden.
    Melbourne, Clive
    University of Salford, United Kingdom.
    Plos, Mario
    Chalmers University of Technology, Göteborg, Sweden.
    Sloth, Mette
    COWI A/S, Lyngby, Denmark.
    Wisniewski, Dawid
    Wroclaw University of Technology, Poland.
    Gylltoft, Kent
    Chalmers University of Technology.
    Thelandersson, Sven
    Lund University, Sweden.
    Johansson, Bernt
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand. Luleå University of Technology, Sweden.
    Elfgren, Lennart
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och brand.
    Guideline for Load and Resistance Assessment of Existing European Railway Bridges, SB-LRA: Advices on the use of advanced methods. Sustainable Bridges Deliverable D4.22007Rapport (Fagfellevurdert)
    Abstract [en]

    The bridge assessment in many aspects is very similar to the bridge design. The same basic principles lie at the heart of the process. Nevertheless, an important difference lies in the fact that when a bridge is being designed, an element of conservatism is generally a good thing that can be achieved with very little additional costs. When a bridge is being assessed, it is important to avoid unnecessarily conservative measures because of the financial implications that may follow the decision of ratingthe bridge as deficient. Therefore, the design codes (e.g. EC codes) may not always be appropriate for assessment of existing bridges and some additional recommendations or guidelines are required that will lead to less conservative assessment of theirs load carrying capacity. Such guidelines have been already proposed for assessment of highway bridges in Europe. However, there is a lack of this type of documents that can be applied for the assessment of railway bridges.The present "Guideline for Load and Resistance Assessment of Existing European Railway Bridges - advices on the use of advanced methods" is providing guidance and recommendations for applying the most advanced and beneficial methods, models and tools for assessing the load carrying capacity of existing railway bridges. This includes systematized step-level assessment methodology, advanced safety formats (e.g. probabilistic or simplified probabilistic) refined structural analysis (e.g. non-linear or plastic, dynamic considering train-bridge interaction), better models of loads and resistance parameters (e.g. probabilistic and/or based on the results of measurements) and methods for incorporation of the results form monitoring and on-site testing (e.g. Bayesian updating). Basis for the "Guideline for Load and Resistance Assessment of Existing EuropeanRailway Bridges - advices on the use of advanced methods" is the research work carried out in the work package WP4 of the Sustainable Bridges project combined with the best practical experience and know-how of all the partners involved. The research activities within the work package WP4 have been carried out in the following five groups:− Loads and dynamic effects, with focus on train loads and dynamics (Deliverables D4.3, also referred as SB 4.3 Dynamic (2007), or just SB4.3 (2007));− Safety and probabilistic modelling (Deliverables D4.4, also referred as SB4.4Safety (2007), or just SB4.4 (2007));− Concrete bridges, with focus on non-linear analysis (Deliverables D4.5, also referred as SB4.5 Concrete (2007), or just SB4.5 (2007));− Metal bridges, with focus on riveted bridges (Deliverables D4.6, also referredas SB4.6 Metal (2007), or just SB4.6 (2007));− Masonry arch bridges including soil/structure interaction (Deliverables D4.7,also referred as SB4.7 Masonry (2007), or just SB4.7 (2007)). The results of these activities are reported in corresponding Background Documents (Deliverables) listed above within parenthesis.The main results from the research activities performed and the know-how of all the partners in the specific areas of bridge assessment are tried to be presented in this Sustainable Bridges SB-LRA 2007-11-30 6 (428) Guideline in such a way that the target reader of the Guideline, a structural engineer experienced in assessment of railway bridges, is able to apply them in the everyday practice, without necessity of searching for several specific scientific publications. Nevertheless, in some cases it has been necessary to refer to public available literature and Background Documents prepared in the Sustainable Bridges project. The present Guideline has been prepared aiming to follow somehow the structure of the EC codes and it is divided into 10 chapters and 12 Annexes concerning:− Assessment procedure (Chapter 2);− Requirements, safety formats and limit states (Chapter 3, Annexes 3.1-3.7);− Basic information for bridge assessment (Chapter 4);− Load and dynamic effects (Chapter 5, Annex 5.1);− Concrete bridges (Chapter 6);− Metal bridges (Chapter 7, Annex 7.1);− Masonry arch bridges (Chapter 8, Annexes 8.1 and 8.2);− Foundations and transition zones (Chapter 9);− Improvement of assessment using information from testing and monitoring (Chapter 10, Annex 10.1). In most of the topics related to railway bridges assessment the Guideline uses the current state-of-the-art knowledge and the presently best practice. Nevertheless, in many subjects it propose the use of original methods and models that have been developed, obtained or systematized due to research performed within one of the five groups of work package WP4. Regarding the loads and dynamic aspects, the innovative elements suggested in the Guideline are:− Train load models for assessment of railway bridges based on the UIC 71 load model and calibrated α-values;− Original methods for quantifying dynamic effects that may lead to reduced dynamic amplification factors.

  • 169.
    Casas, Joan Ramon
    et al.
    Universitat Politècnica de Catalunya, Barcelona, Spain.
    Wisniewski, Dawid
    Wroclaw University of Technology, Poland.
    Cervenka, Jan
    Cervenka Consulting, Praha, Czech.
    Cervenka, Vladimir
    Cervenka Consulting, Praha, Czech.
    Pukl, Radomir
    Cervenka Consulting, Praha, Czech.
    Brühwiler, Eugen
    EPFL, Lausanne, Switzerland.
    Herwig, Andrin
    EPFL, Lausanne, Switzerland.
    Holm, Göran
    Swedish Geotechnical Institute, Lindköping, Sweden.
    Bengtsson, Per Evert
    Swedish Geotechnical Institute, Lindköping, Sweden.
    Plos, Mario
    Chalmers University of Technology, Göteborg, Sweden.
    Safety and Probabilistic Modelling: Sustainable Bridges Background document D4.42007Rapport (Fagfellevurdert)
    Abstract [en]

    The main objective of this background document is to bridge the gap between the most advanced structural assessment techniques based on probabilistic methods and the daily practice of bridge evaluators in the railway agencies, not specifically trained on them and responsible of the load and resistance assessments. To this end, the background document explains and summarizes the basis of the safety assessment using a probabilistic approach, providing simplified methods whenever possible and also providing examples of application in order to make the documents more readable and understandable.The present background document is divided in the following deliverables:

    D4.4.1 Safety format and required safety levels

    D4.4.2 Probabilistic modelling

    D4.4.3 Probabilistic non-linear analysis

    D4.4.4 Examination of fatigue safety and remaining fatigue life of structural details andcomponents in steel of railway bridges using probabilistic methods

    D4.4.5 Long-term behaviour of subsoil below railway embankments – A simplified predictionmethod of settlements with a probabilistic approach

  • 170.
    Casselgren, Johan
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
    Engström, Niclas
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Maskinelement.
    Rosendahl, Sara
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Strömningslära och experimentell mekanik.
    Fransson, Lennart
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Investigation of ice surface change during vehicle testing2014Inngår i: International Journal of Vehicle Systems Modelling and Testing, ISSN 1745-6436, E-ISSN 1745-6444, Vol. 9, nr 2, s. 137-150Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Today, there are a lot of vehicles and tyre testing carried out on lake ice surfaces. Thus, it is important to have knowledge about parameters that affect roadgrip. The thesis within this paper is that the liquid like layer which appears due to increasing temperature can be reduced by manipulating the ice roughness. This in turn should decrease the temperature dependence of the roadgrip in temperatures around 0°C. In order to investigate this, measurements of temperature, surface roughness and hardness and roadgrip were performed on three outdoor ice surfaces using an IR thermometer, an optical sensor with three IR-diodes, a steel ball drop indentation test and an RT3 curve, respectively. Additional ice roughness measurements were also made on two tempered ice surfaces in an ice hall. Results show a clear connection between ice temperature and roadgrip, unfortunately the created ice roughness was too small to influence the change in roadgrip

  • 171.
    Cederwall, Krister
    Luleå tekniska universitet.
    Behavior of a reinforced ice-cover with regard to creep1981Inngår i: POAC 81: the sixth international conference on port and ocean engineering under arctic conditions, Québec, Canada July 27-31, 1981..., Universite Laval , 1981, s. 562-570Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Different kinds of reinforcing materials have been tested in order to find out the possible increase in the bearing capacity and ductility of an ice-cover. A number of fifty ice-beams have been tested both in the field and in the laboratory. It has been shown that by rather simple means, for instance by wooden reinforcement, it is possible to increase the bearing capacity about three times and the ductility up to twenty times. The ice-cover can be supplied with reinforcement both in the upper surface and in the lower surface. It has moreover been shown that rather high tensile stresses in the reinforcement can be utilized when the ice-cover is loaded above the cracking stage. At ultimate load, tensile stresses in steel-reinforcement are found to be in the vicinity of 400 MPa. Shear or heavy bond slip can be the cause of failure when too large amount of reinforcement is used. In order to get more accurate design recommendations, a number of ice-beams have been studied in the laboratory. The stress-distribution in the compressive zone and its change with the loading time have been studied in some creep-tests. A bending theory that includes the effect of creep in the compression zone has been derived. The agreement between theory and experiment is sufficiently good

  • 172.
    Cederwall, Krister
    et al.
    Luleå tekniska universitet.
    Degerman, Tryggve
    Luleå tekniska universitet.
    Fransson, Lennart
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Ispåverkan på plana låglutande papptäckta tak1984Rapport (Annet vitenskapelig)
  • 173.
    Cederwall, Krister
    et al.
    Chalmers University of Technology.
    Edlund, Bo L.O.
    Chalmers University of Technology.
    Elfgren, Lennart
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Hjalmar Granholm: Legendarisk V-professor på Chalmers 1939-19651998Rapport (Annet (populærvitenskap, debatt, mm))
    Abstract [sv]

    En kortfattad beskrivning av Hjalmers Granholms insatser som professor i byggnadsteknik på Chalmers tekniska högskola. Han föddes 1900 i Innertavle i Ume landsförsamling och dog 1972 i Göteborg

  • 174.
    Cederwall, Krister
    et al.
    Chalmers University of Technology.
    Elfgren, Lennart
    Losberg, Anders
    Chalmers University of Technology.
    Prestressed concrete columns under long-time loading1970Konferansepaper (Fagfellevurdert)
  • 175. Cederwall, Krister
    et al.
    Fransson, Lennart
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Cracking a roof felt caused by an ice-cover1989Inngår i: POAC '89: 10th International conference on port and ocean engineering under arctic conditions / [ed] Kenneth B.E. Axelsson; Lennart Å. Fransson, Luleå: Luleå tekniska universitet, 1989, Vol. 2, s. 796-807Konferansepaper (Annet vitenskapelig)
  • 176. Cermona, Christian
    et al.
    Bien, Jan
    Elfgren, Lennart
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Field testing of old bridges2007Inngår i: Sustainable bridges: assessment for future traffic demands and longer lives / [ed] Jan Bien; Lennart Elfgren; Jan Olofsson, Wrocław: Dolnoslaskie Wydawnictwo Edukacyjne , 2007, s. 423-433Konferansepaper (Fagfellevurdert)
  • 177. Cermona, Christian
    et al.
    Patron, Alberto
    Hoehler, Susan
    Eichler, Björn
    Johansson, Bernt
    Larsson, Tobias
    Improved assessment methods for static and fatigue resistance of old metal railway bridges2007Inngår i: Sustainable bridges: assessment for future traffic demands and longer lives / [ed] Jan Bien; Lennart Elfgren; Jan Olofsson, Wrocław: Dolnoslaskie Wydawnictwo Edukacyjne , 2007, s. 261-272Konferansepaper (Fagfellevurdert)
  • 178. Christian, Cremona
    et al.
    Johansson, Bernt
    Larsson, Tobias
    Patron, Alberto
    S, Hoehler
    B, Eichler
    Improved assessment methods for static and fatigue resistance of old metal railway bridges2008Inngår i: Bridge Maintenance, Safety Management, Health Monitoring and Informatics: Proceedings of the Fourth International Conference on Bridge Maintenance, Safety and Management, July 13-17 2008, Seoul, Korea - IABMAS '08, Boca Raton, Fla: Taylor and Francis Group , 2008, s. 3666-3674Konferansepaper (Fagfellevurdert)
  • 179.
    Cnudde, V.
    et al.
    Department of Geology and Soil Science, Ghent University.
    Cwirzen, A.
    Laboratory of Building Materials Technology, Faculty of Engineering and Architecture, Helsinki University of Technology, Espoo.
    Masschaele, B.
    Department of Geology and Soil Science, Ghent University.
    Jacobs, P. J S
    Department of Geology and Soil Science, Ghent University.
    Porosity and microstructure characterization of building stones and concretes2009Inngår i: Engineering Geology, ISSN 0013-7952, E-ISSN 1872-6917, Vol. 103, nr 3-4, s. 76-83Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The microstructure of building materials greatly influences engineering properties like permeability, strength and durability. To determine this microstructure, different techniques were developed, each with its own limitations. The purpose of this study on concrete and natural building stones was to compare and to combine data obtained by X-ray computed micro-tomography (micro-CT), water absorption under vacuum and mercury intrusion porosimetry (MIP). Pore-size distribution curves ranging from 10 nm to 1 mm and total porosity results were obtained. Furthermore, micro-CT revealed the presence of an interfacial transition zone (ITZ) and of micro-cracks inside the aggregates of the concrete samples after mercury intrusion. Micro-CT visualized mercury inside large air bubbles within the concrete samples. Both micro-CT and MIP were compared and their respective advantages and disadvantages discussed. © 2008 Elsevier B.V. All rights reserved.

  • 180. Colldin, Ylva
    Waterproofing of concrete bridges1991Licentiatavhandling, monografi (Annet vitenskapelig)
  • 181.
    Collin, Peter
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Steel Concrete Composite Structures: Part II: Introduction2010Inngår i: Structural Engineering International, ISSN 1016-8664, E-ISSN 1683-0350, Vol. 20, nr 2, s. 126-126Artikkel i tidsskrift (Fagfellevurdert)
  • 182.
    Collin, Peter
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Vippning av stålbalkar i hallramar1991Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    The present thesis, written in Swedish, deals with the problem of lateral-torsional buckling, especially in gable frames. The aim of the work presented is to suggest an improved design method that takes into account the translational and rotational restraint produced by the roof and wall. A particular question is the behaviour of the comer region. More specific, is it a safe assumption to consider the comer as a lateral support. The study includes a review of literature and design methods, analytical solutions of some stability problems, tests on four frames and a FEM simulation. The design methods for lateral buckling usually start from the elastic critical load which defines a relative slenderness of the structure. This slenderness finally gives the predicted capacity. The lateral buckling theory has to take cross-sectional distortion into account because the rotational restraint is often provided concentratedly by purlins or wall rails. This distortion is important also for rolled beams which was not expected. Closed form solutions are presented for the column and references are given to solutions for the roof beam. In order to get some indication of the stability of the comer of a frame, the inner flanges and the stiffener were modelled as a three rod system. The slope of the roof turned out to be of no significance. The results also indicated that the stability of the comer could be questioned when the critical loads of the column and the girder were close to each other. This conclusion was also reached by studies of elasto-plastic frames carried out by Stoverink, at the RWIH, Aachen. Four frames of IPE 180, of which two were haunched, were tested. The two unhaunched frames reached their plastic capacity, and showed a ductile behaviour although their relative slenderness was above the normally accepted limit for full capacity. The two haunched frames, however, buckled before their plastic capacity was reached. This indicates that haunched frames of this type can not be expected to develop their full plastic capacity under conditions similar to those during testing. Finally, the Swedish standards are compared with experimental results, and improvements are suggested. Guidelines are also drawn up for the design of low-rise frames with respect to lateral buckling.

  • 183.
    Collin, Peter
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Workshop on eC4-2: Introduction + some Swedish R&D projects2011Inngår i: International Workshop on Eurocode 4-2 – Composite Bridges: Stockholm, March 17th 2011 / [ed] Peter Collin; Martin Nilsson; Jens Häggström, Luleå: Luleå tekniska universitet, 2011, s. 1-10Konferansepaper (Annet vitenskapelig)
  • 184.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Fladvad, Per
    Scandiaconsult Sverige AB.
    Ut med doktorn i produktionen!1999Inngår i: Dagens Industri, ISSN 0346-640X, s. 4-Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 185.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Häggström, Jens
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Hällmark, Robert
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    International workshop on strengthening of steel/composite bridges2015Rapport (Annet vitenskapelig)
    Abstract [en]

    The European infrastructure is rapidly aging, and steel/composite bridges are noexception to the rule. With thousands of older steel/composite bridges, there is ademand of rational methods to strengthen the older bridges to compensate not onlyfor their age, but also for higher loads and new codes, of which perhaps the newfatigue rules for highway bridges in EC3-2 will be the hardest to meet.Within the frames of the European R&D project Prolife (RFCS-CT-2015-00025) aworkshop was arranged in Stockholm September 28th 2015. Bridge owners,designers and researchers from 12 countries participated, and the similaritiesbetween the countries as well as the variety of technical solutions were highlighted.The contributions are presented in this report and the organizers want to thank allparticipants for making this seminar successful.

  • 186.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Höglund, Torsten
    Pétursson, Hans
    Samverkansbroar med elementbyggda farbanor1998Rapport (Annet vitenskapelig)
    Abstract [sv]

    Publikationen beskriver olika effektiva sätt att bygga samverkansbroar med stålbalkar och prefabricerade farbaneelement av betong. Konceptet är konkurrenskraftigt i jämförelse med konventionella lösningar, särskilt då hänsyn tas till trafikantnytta. Exempel på utförda projekt i Sverige och övriga världen redovisas, samt fullskaleprovningar av farbaneelementen.

  • 187.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Johansson, Bernt
    Bridges in high strength steel2006Inngår i: Responding to Tomorrow's Challenges in Structural Engineering: IABSE Symposium Budapest 2006 ; report, Zürich: International Association for Bridge and Structural Engineering, 2006, s. 434-435Konferansepaper (Fagfellevurdert)
  • 188.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Johansson, Bernt
    Bättre samverkansbroar på väg2001Inngår i: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, nr 1, s. 35-40Artikkel i tidsskrift (Annet vitenskapelig)
  • 189.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Johansson, Bernt
    Design of welds in high strength steel2005Inngår i: EUROSTEEL 2005: 4th European Conference on Steel and Composite Structures / [ed] B. Hoffmeister; O. Hechler, Aachen: Verlag Mainz , 2005, s. 4.10/89-4.10/99Konferansepaper (Fagfellevurdert)
  • 190.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Johansson, Bernt
    Elementbyggda broar: ett koncept med slagkraft1997Inngår i: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, nr 3, s. 32-35Artikkel i tidsskrift (Annet vitenskapelig)
  • 191.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Johansson, Bernt
    Eurocode for high strength steel and applications in construction2005Inngår i: Super-High Strength Steels: 1st international conference, 2 - 4 November 2005, Rome, Italy, [proceedings], Milano: Associazione Italiana di Metallurgia , 2005Konferansepaper (Fagfellevurdert)
  • 192.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Johansson, Bernt
    Snabba och starka stålbroar1997Inngår i: Husbyggaren : bygg, el, VVS, anläggning, ISSN 0018-7968, nr 2Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 193.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Johansson, Bernt
    Vettbewerbsfähige Brücken in Verbundbauweise1999Inngår i: Stahlbau, ISSN 0038-9145, E-ISSN 1437-1049, Vol. 68, nr 11, s. 908-918Artikkel i tidsskrift (Fagfellevurdert)
  • 194.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Johansson, Örjan
    Banverket.
    Lundmark, Tore
    SCC Sverige AB.
    Ny teknik förlänger livet för Forsmobron2003Inngår i: V-byggaren : väg- och vattenbyggaren, ISSN 0283-5363, nr 1, s. 44-47Artikkel i tidsskrift (Annet vitenskapelig)
  • 195.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Lundmark, Tore
    Scandiakonsult.
    Competitive Swedish composite bridges2002Inngår i: IABSE symposium Melbourne 2002: towards a better built environment - innovation, sustainability, information technology; Melbourne, Australia 11 - 13 September, 2002, Zürich: International Association for Bridge and Structural Engineering, 2002Konferansepaper (Fagfellevurdert)
    Abstract [en]

    During the 1990's, composite steel and concrete bridges took over an increasing portion of the market. The purpose of this article is to highlight current developments in the field of girder bridges, which account for the majority of the composite bridges.

  • 196.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Möller, M.
    Luleå tekniska universitet.
    Stoltz, Anders
    Luleå tekniska universitet.
    Ponts mixtes à dalles préfabriquées2001Inngår i: Construction Métallique, ISSN 0045-8198, nr 3Artikkel i tidsskrift (Fagfellevurdert)
  • 197.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Möller, Mikael
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Shear buckling resistance of non-uniform thickness bridge girder webs2010Inngår i: 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, Zürich: International Association for Bridge and Structural Engineering, 2010, s. 41-47Konferansepaper (Fagfellevurdert)
  • 198.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Möller, Mikael
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Structural applications for high strength steel1998Inngår i: Proceedings / Nordic Steel Construction Conference 98: Bergen, Norway, September 14th - 16th, 1998 ; new materials, new codes, new applications, Oslo: Norwegian Steel Association , 1998Konferansepaper (Fagfellevurdert)
  • 199.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Möller, Mikael
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Johansson, Bernt
    Lateral-torsional buckling of continuous bridge girders1998Inngår i: Journal of constructional steel research, ISSN 0143-974X, E-ISSN 1873-5983, Vol. 45, nr 2, s. 217-235Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The resistance of bridge girders with respect to lateral-torsional buckling at support is strongly influenced by the moment gradient. In most design methods this influence is taken into account by the use of a correct critical bending moment in the slenderness parameter λ. This critical moment is influenced by the shape of the moment diagram as well as the distortion of the cross-section and the restraint from the web and stiffeners, if any. In this paper, a method for the calculation of the critical moment is presented. A further effect of the moment gradient is that the stresses due to lateral bending of the flange in connection with lateral-torsional buckling does not coincide with the maximum of stresses caused by bending in the vertical plane. This is taken into account by performing the check for lateral-torsional buckling in a design section at some distance from the support. A design procedure based on this concept has been introduced in Eurocode 3 Part 2: Steel Bridges

  • 200.
    Collin, Peter
    et al.
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Möller, Mikael
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Nilsson, Mattias
    Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Byggkonstruktion och -produktion.
    Törnblom, Svante
    Luleå tekniska universitet.
    Undermatching butt welds in high strength steel2009Inngår i: 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, s. 280-281Konferansepaper (Fagfellevurdert)
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