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  • 301.
    Girhammar, Ulf Arne
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Gustafsson, Per Johan
    Division of Structural Mechanics, Department of Building Sciences, Lund University.
    Källsner, Bo
    Department of Building Technology, Linnaeus University.
    Modeling of shear walls using finite shear connector elements based on continuum plasticity2017In: Frontiers of Structural and Civil Engineering, ISSN 2095-2430, E-ISSN 2095-2449, Vol. 11, no 2, p. 143-157Article in journal (Refereed)
    Abstract [en]

    Light-frame timber buildings are often stabilized against lateral loads by using diaphragm action of roofs, floors and walls. The mechanical behavior of the sheathing-to-framing joints has a significant impact on the structural performance of shear walls. Most sheathing-to-framing joints show nonlinear load-displacement characteristics with plastic behavior. This paper is focused on the finite element modeling of shear walls. The purpose is to present a new shear connector element based on the theory of continuum plasticity. The incremental load-displacement relationship is derived based on the elastic-plastic stiffness tensor including the elastic stiffness tensor, the plastic modulus, a function representing the yield criterion and a hardening rule, and function representing the plastic potential. The plastic properties are determined from experimental results obtained from testing actual connections. Load-displacement curves for shear walls are calculated using the shear connector model and they are compared with experimental and other computational results. Also, the ultimate horizontal load-carrying capacity is compared to results obtained by an analytical plastic design method. Good agreements are found.

  • 302.
    Girhammar, Ulf Arne
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Jacquier, Nicolas
    Byggtekniska Byrån.
    Källsner, Bo
    Department of Building Technology, Linnaeus University.
    Stiffness model for inclined screws in shear-tension mode in timber-to-timber joints2017In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 136, p. 580-595Article in journal (Refereed)
    Abstract [en]

    A stiffness model for inclined screws in timber joints, or as shear connectors in composite timber-to-timber members, is presented. Elastic conditions applicable to the initial or linearized part of the load-deformation response in the serviceability limit state are assumed. The model for the stiffness or slip modulus is general in nature; it includes both the dowel (or shearing) action and withdrawal action of the screw, the friction between the members and it takes into account possible dissimilar properties and geometries of the different parts of the joint configuration. The model is simplified in the sense that the screw is assumed rigid and the withdrawal stresses along the length of the screw are assumed evenly distributed. However, the effects of flexibility and extensibility of the screw are taken into account by applying a theoretically derived correction factor for the embedment and withdrawal stiffness modulus, respectively. The proposed model is illustrated showing the total stiffness versus the inclination, as well as the relative contributing effect from the shearing and withdrawal stiffness, respectively, the influence of the friction coefficient. Also, the effect of dissimilar properties and geometries between the two parts of the joint is illustrated. Experimental verification of the proposed model is also given. Comparisons with other stiffness models are also made.

  • 303.
    Girhammar, Ulf Arne
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Källsner, Bo
    School of Engineering, Linnæus University, Växjö, Linnéuniversitetet, Linnaeus University, Växjö.
    Design against brittle failure of bottom rails in shear walls2016In: Proceedings of the Institution of Civil Engineers: Structures and buildings, ISSN 0965-0911, E-ISSN 1751-7702, Vol. 169, no 10, p. 782-793Article in journal (Refereed)
    Abstract [en]

    The authors have developed a new plastic design method for light-framed timber shear walls, which is capable ofanalysing the load-bearing capacity of partially anchored shear walls. For proper application of the plastic method it isnecessary to ensure ductile behaviour of the sheathing-to-framing joints and to avoid brittle failure of the bottomrail. In a partially anchored shear wall, the tying down forces are developed in the sheathing-to-framing joints alongthe bottom rail, which may introduce a brittle type of failure of the bottom rail that needs to be eliminated in orderfor the plastic method to be applicable. This paper deals with design of anchor bolts needed to tie down the bottomrail properly and it describes experimental results for proper design of washers for anchor bolts to avoid thesesplitting failures of the bottom rail. The effect of different washer sizes and location of the anchor bolts on the failureload when splitting of the bottom rail occurs is presented. The tests indicate that the failure load depends on thedistance from the edge of the washer to the loaded edge of the bottom rail. An explicit design equation for thecapacity of the bottom rail is presented.

  • 304.
    Girhammar, Ulf Arne
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Källsner, Bo
    Department of Building Technology, Linnaeus University.
    Horizontal Stabilisation of Sheathed Timber Frame Structures Using Plastic Design Methods – Introducing a Handbook: Part 1: Design Principles for Horizontal Stabilisation2016In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 161, p. 618-627Article in journal (Refereed)
    Abstract [en]

    The authors have developed a plastic design method for sheathed timber frame shear walls. It has been presented and discussed for inclusion in Eurocode 5 and a Swedish handbook has been presented. In the plastic method, you can choose to transfer the anchoring force via the leading stud to the substrate, corresponding to a fully anchored shear wall (no uplift of studs), but you can also choose to utilize the sheathings to transfer the tensile force via the sheathing-to-framing joints to the substrate by anchoring the bottom rail, corresponding to a partially anchored shear wall (studs experience uplift). By the plastic method several alternatives for anchoring the wall are possible and they can also be combined in such a way that each of them take a portion of the uplifting force, e.g. through a simple tying down device, through the sheathing-to-framing joints and through anchoring of the shear wall to the transverse wall. The method also makes it possible to include the load-bearing capacity of wall segments including openings. The handbook treats primarily shear walls, but for the sake of completeness some aspects of the roof and floor diaphragms are also discussed. The interior force distribution in sheathed timber frame walls weak in shear is discussed, as are the fundamental difference between the effect of vertical loads on the stabilisation of walls which are rigid or weak in shear, and how the plastic design method is applied to multi-storey timber buildings

  • 305.
    Girhammar, Ulf Arne
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Källsner, Bo
    Department of Building Technology, Linnaeus University.
    Horizontal Stabilisation of Sheathed Timber Frame Structures Using Plastic Design Methods – Introducing a Handbook: Part 2: Design of Joints and Anchoring Devices2016In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 161, p. 628-635Article in journal (Refereed)
    Abstract [en]

    In this part 2, the practical design and strength of a number of different joints is described: (1) Sheathing-to-framing joints – the plastic design method is based on the premise that the load-displacement relationship of the sheathing-to-framing joints has sufficiently large plastic deformation capacity; the sheathing-to-framing joints have great influence on the load-carrying capacity of the wall; (2) Stud-to-rail joints – by utilizing the shear capacity of the stud-to-rail joints, the plastic design method can be simplified and the load-carrying capacity can be increased; (3) Hold down devices for the (leading) stud – the capacity of the tying down force of the hold down determines whether the shear wall will act as fully or partially anchored; tying down the shear walls by connecting them to the transverse walls leads to a 3-dimensioonal behaviour that is a very favourable for the load-carrying capacity and the stiffness of the shear wall; through transverse walls the anchoring of the leading stud can be reduced or eliminated (those types of transverse wall connections are not discussed in detail in this paper); and (4) Anchoring devices for the bottom rail – in partially anchored shear walls it is necessary that the bottom rail is anchored to the substrate against uplift. Characteristic values for the different types of joints are given. Also, joints between the panels in the walls, roofs and floors are described briefly.

  • 306.
    Girhammar, Ulf Arne
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Källsner, Bo
    Department of Building Technology, Linnaeus University.
    Horizontal Stabilisation of Sheathed Timber Frame Structures Using Plastic Design Methods – Introducing a Handbook: Part 3: Basics of the Plastic Design Method2016In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 161, p. 636-644Article in journal (Refereed)
    Abstract [en]

    Design of shear walls has been a topic of major discussions to develop a common European code for design of timber structures. The main problem has been that shear walls are fastened to the substrate in different ways in different countries and that this fact must be reflected in the code. In this part the requirements are given that must be met for the ductile characteristics of the sheathing-to-framing joints in order for the plastic design method to be applicable. The method is based on the plastic lower bound theory. The fundamental prerequisites for the method are that the static equilibrium for the structure is fulfilled and that the sheathing-to-framing joints are ductile. What requirements that should be made on the mechanical properties of the joints for the plastic design methods to be applicable and the precaution measures to take to avoid brittle behaviour are discussed. The two main principles for anchoring of sheathed timber frame shear walls, fully and partially anchored, are illustrated showing the static behaviour of the walls and the force distribution in the framing members and the sheathings. In addition, a general description of the design in the serviceability limit state is given. For medium-rise and taller buildings the serviceability limit state needs to be taken into account. There are no specified criteria for deformations in the present code.

  • 307.
    Girhammar, Ulf Arne
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Källsner, Bo
    Department of Building Technology, Linnaeus University.
    Horizontal Stabilisation of Sheathed Timber Frame Structures Using Plastic Design Methods – Introducing a Handbook: Part 4: Design in Ultimate Limit State2016In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 161, p. 645-654Article in journal (Refereed)
    Abstract [en]

    In this part 4, the horizontal load-carrying capacity of fully and partially anchored sheathed timber frame walls subjected to arbitrary vertical loads is presented for different models. For fully anchored walls, the elastic method is summarised (for comparison reasons) and a corresponding simple plastic method is presented. For partially anchored walls, three different plastic methods are presented: (1) no contact forces between adjacent sheets occur; (2) contact forces between the sheets; and (3) contact forces between the sheets and also with stud-to-rail joints taken into account. All the proposed plastic models are based on plastic characteristics of the sheathing-to-framing joints and that a plastic lower bound method is used. The proposed models are simple and flexible and can be applied to different wall geometries, boundary conditions, loading configurations, and number of storeys. The developed plastic design methods for fully and partially anchored sheathed timber frame shear walls have been verified through extensive analytical and experimental studies. This part is the last one in a series introducing the handbook to the international community.

  • 308.
    Girhammar, Ulf Arne
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Källsner, Bo
    Department of Building Technology, Linnaeus University.
    Tests and Analyses of Slotted-In Steel-Plate Connections in Composite Timber Shear Wall Panels2017In: Advances in Civil Engineering / Hindawi, ISSN 1687-8086, E-ISSN 1687-8094, Vol. 2017, article id 7259014Article in journal (Refereed)
    Abstract [en]

    The authors present an experimental and analytical study of slotted-in connections for joining walls in the Masonite flexible building (MFB) system. These connections are used for splicing wall elements and for tying down uplifting forces and resisting horizontal shear forces in stabilizing walls. The connection plates are inserted in a perimeter slot in the PlyBoard™ panel (a composite laminated wood panel) and fixed mechanically with screw fasteners. The load-bearing capacity of the slotted-in connection is determined experimentally and derived analytically for different failure modes. The test results show ductile postpeak load-slip characteristics, indicating that a plastic design method can be applied to calculate the horizontal load-bearing capacity of this type of shear walls.

  • 309.
    Grimm, Alejandro
    et al.
    Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology, Biomass Technology Centre.
    Elustondo, Diego
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Mäkelä, Mikko
    Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology, Biomass Technology Centre.
    Segerström, Markus
    Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology, Biomass Technology Centre.
    Kalén, Gunnar
    Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology, Biomass Technology Centre.
    Fraikin, Laurent
    University of Liège, Chemical Engineering, PEPs – Products, Environment, and Processes.
    Léonard, Angélique
    University of Liège, Chemical Engineering, PEPs – Products, Environment, and Processes.
    Larsson, Sylvia H.
    Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology, Biomass Technology Centre.
    Drying recycled fiber rejects in a bench-scale cyclone: Influence of device geometry and operational parameters on drying mechanisms2017In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 167, p. 631-640Article in journal (Refereed)
    Abstract [en]

    Significant amounts of waste sludge and rejects are generated by pulp and paper mills, and stricter environmental regulations have made waste handling a global challenge. Thermochemical conversion of mechanically dewatered by-products is expensive and inefficient due to their high moisture content; therefore drying is a vital unit operation in waste management. This paper reports results from drying of light coarse fiber reject in a bench-scale cyclone that allows changes in geometry. For the sake of comparison, convective fixed-bed drying tests were also performed. The results showed that the drying rate in the cyclone was hundreds of times higher than in the fixed-bed. For cyclone drying, the inlet air velocity was the most important factor in both determining the drying rate and residence time of the material. This led to the hypothesis that grinding of the reject particles due to particle-wall and particle-particle collisions play a crucial role in enhancing the efficiency of heat and mass transfer. In addition to inlet air velocity, cyclone geometry was the main factor that determined particle residence time, as drying air temperature mainly determined drying rate.

  • 310.
    Grubii, Victor
    et al.
    Luleå tekniska universitet.
    Öhman, Micael
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Ekevad, Mats
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Influence of Wetting on Surface Quality during Scots Pine Planing2015Conference paper (Refereed)
  • 311.
    Grundberg, Staffan
    et al.
    Umeå University. Department of Applied Physics and Electronics.
    Girhammar, Ulf Arne
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    A comparison of exact and approximate analyses of partially interacting composite Beam-Columns2015In: Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing / [ed] J. Kruis; Y. Tsompanakis; B.H.V. Topping, Stirlingshire: Civil-Comp Press , 2015, article id 261Conference paper (Refereed)
    Abstract [en]

    This paper deals with deflection analysis of a deep composite box beam due to inplane shear deformations, especially the modelling of the shear deformations in the webs is considered. The beam is composed of three framing members with sheathings on both sides. The sheathings or webs between the framing members are modelled as shear media with equivalent slip moduli corresponding to the partially composite beam model with three separated layers and two interlayer slip areas. The minimum total potential energy principle is employed to obtain the governing equilibrium equations and corresponding boundary conditions. The coupled set of governing equations is recast into an uncoupled form and solved explicitly together with the corresponding boundary conditions. The closed-form solutions obtained are compared to those based on the conventional beam theories. It is shown that the model is capable of predicting accurately the deflections for a wide range of geometry and property parameters, especially for small shear stiffness (slip modulus) values for the webs. The formula for the deflection is reduced to the Timoshenko formula for full composite interaction when the shear slip modulus of the web approaches infinity. Comparative numerical results are presented to show the influence of bending deformations, shear deformations in the framing layers and the in-plane shear deformations in the sheathings

  • 312. Grundberg, Stig
    et al.
    Axelsson, Bengt
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Verktygsförslitning: mätmetodik - inverkande faktorer1987Report (Other academic)
  • 313. Grundberg, Stig
    et al.
    Fredriksson, Johan
    Oja, Johan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Andersson, Carola
    Förbättrade metoder vid användning av 3D-mätramar2001Report (Other academic)
  • 314. Grundberg, Stig
    et al.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Feature extraction with the aid of an X-ray log scanner1998In: Proceedings from the 3rd International Seminar/Workshop on Scanning Technology and Image Processing on Wood: Skelleftea, Sweden, Aug. 17 - 19, 1998 / [ed] Owe Lindgren; Anders Grönlund; Olle Hagman, Luleå: Luleå tekniska universitet, 1998Conference paper (Refereed)
  • 315. Grundberg, Stig
    et al.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Log scanning: extraction of knot geometry in CT-volumes1992In: Proceedings from the Seminar/Workshop on Scanning Technology and Image Processing on Wood, Skellefteå, Sweden, Aug. 30 - Sept. 1, 1992, Skellefteå, 1992Conference paper (Refereed)
  • 316. Grundberg, Stig
    et al.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Methods for reducing data when scanning for internal log defects1991In: Proceedings: 4th International Conference on Scanning Technology in the Wood Industry, San Francisco, Calif: Forest Industries , 1991Conference paper (Refereed)
  • 317. Grundberg, Stig
    et al.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Simulated grading of logs with an X-ray Log Scanner: Grading accuracy compared with manual grading1997In: Scandinavian Journal of Forest Research, ISSN 0282-7581, E-ISSN 1651-1891, Vol. 12, no 1, p. 70-76Article in journal (Refereed)
  • 318. Grundberg, Stig
    et al.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    The Development of a Log-Scanner for Scots Pine1995In: Proceedings from the 2nd International Seminar/Work­shop on Scanning Technology and Image Processing on Wood, Luleå: Högskolan i Luleå , 1995, p. 39-50Conference paper (Refereed)
  • 319. Grundberg, Stig
    et al.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Grönlund, Ulla
    The Swedish stem bank: a database for different silvicultural and wood properties1995Report (Other academic)
  • 320. Grundberg, Stig
    et al.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Lindgren, Owe
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Noggrannhet vid detektering av stockars inre kvalitet: avrapportering av steg 11989Report (Other academic)
  • 321. Grundberg, Stig
    et al.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Oja, Johan
    Israelsson, M.
    Log models reconstructed from X-ray LogScanner signal1999In: Connection between silviculture and wood quality through modelling approaches and simulation softwares: third workshop : La Londe-Les-Maures, France, 1999 : proceedings / [ed] Gérard Nepveu, Nancy: INRA Editions, 1999Conference paper (Refereed)
  • 322. Grundberg, Stig
    et al.
    Hagman, Olle
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Measuring active wood fracture surfaces1993In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 51, no 1, p. 49-54Article in journal (Refereed)
    Abstract [en]

    This report describes a measurement method, based on image processing, for calculating the proportion of active wood fractures in a sheet of particle board that has been pulled apart. This method gives an indirect measurement of the effectiveness of the glue in a particle board. The basic procedure is to separate different surfaces on both sides of the tensile fracture. The separation of the glue covered surfaces from wood surfaces has been enhanced by a development process. The separated surfaces for each side, represented in the form of a binary image, are added, and a proportion of the surface with coinciding wood surfaces represents the proportion of wood fractures. The error analysis covers the randomly obtained coinciding surfaces.

  • 323. Grundberg, Stig
    et al.
    Hagman, Olle
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Multivariate image analysis methods to classify features on scots pine: evaluation of a multisensor approach1993In: Scan Pro: 5th International Conference on Scanning Technology & Process Control for the Wood Products Industry : Atlanta GA USA Renaissance Hotel, October 25-27, 1993 : conference proceedings / [ed] Ryszard Szymani, San Francisco: Miller Freeman , 1993Conference paper (Refereed)
  • 324. Grundberg, Stig
    et al.
    Hagman, Olle
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Rese- och konferensrapport: USA 19891990Report (Other academic)
  • 325. Grundberg, Stig
    et al.
    Hagman, Olle
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Utveckling av mätmetod för beräkning av andel träbrott i spånskiva1991Report (Other academic)
  • 326. Grundberg, Stig
    et al.
    Lindgren, Owe
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    The development of an X-ray based scanner for log grading at full protection speed1996In: Proceedings / 10th International Symposium on Nondestructive Testing of Wood: Lausanne, Switzerland, August 26-27-28, 1996 / [ed] J.L. Sandoz, Lausanne: Swiss Federal Institute of Technology , 1996Conference paper (Refereed)
  • 327. Grundberg, Stig
    et al.
    Oja, Johan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Grönlund, Anders
    Detecting knots in logs using a simulated X-ray cone-beam scanner2004In: Fourth workshop "Connection between forest resources and wood quality: modelling approaches and simulation software" : Harrison Hot Springs, British Columbia, Canada, September 8 - 15, 2002 ; proceedings / [ed] Gerard Nepveu, International Union of Forestry Research Organisations , 2004Conference paper (Other academic)
  • 328.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Benefits from knowing the interior of the log1992In: Proceedings from the Seminar/Workshop on Scanning Technology and Image Processing on Wood, Skellefteå, Sweden, Aug. 30 - Sept. 1, 1992, Skellefteå, 1992Conference paper (Refereed)
  • 329.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Beskrivning av sönderdelningsmodell1987Report (Other academic)
  • 330.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Efficient wood processing1990In: Science in forestry: IUFRO's second century: Montréal, Canada, 1990, XIX world congress, 5-11, August 1990 = La science au service de la foresterie: à l'aube du second siècle de l'IUFRO = Wissenschaft für den Wald: IUFROs zweites Jahrhundert = La ciencia en la silvicultura: segundo siglo de IUFRO, Hull, Quebec: IUFRO Organizing Committee, , 1990Conference paper (Refereed)
  • 331.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    HF-limning av lamellkonstruktioner1989Report (Other academic)
  • 332.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Integrerad produktion av limfog och andra solidträprodukter2009Report (Other academic)
  • 333.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Kvistlagning av träfönster1983Report (Other academic)
  • 334.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Lamellimning av fönsterämnen: delrapport 1 : fältprovning1985Report (Other academic)
  • 335.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Lamellimning av fönsterämnen: delrapport 2: slutrapport1987Report (Other academic)
  • 336.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Lamellimning av fönsterämnen: erfarenhetsåterföring1983Report (Other academic)
  • 337.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Measuring of logs: Different accuracy levels1992In: Better wood products through science : All-Division 5 conference "Forest Products", Nancy, France, August 23 - 28, 1992 ; [proceedings], ENGREF , 1992Conference paper (Refereed)
  • 338.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Sawing accuracy in practice1997In: Proceedings of the 13th international wood machining seminar, FORINTEK , 1997Conference paper (Refereed)
  • 339.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    SkeWood, ett forskningsprogram vid Luleå tekniska unversitet: slutrapport2008Report (Other academic)
    Abstract [sv]

    Huvudmän för SkeWoodprogrammet, som startade år 2000, är Stiftelsen Träenigheten, Luleå tekniska universitet och staten genom Verket för innovationssystem, VINNOVA, som från och med 2001-01-01 övertog ansvaret från Närings- och teknikutvecklingsverket, NUTEK. Ett trepartsavtal mellan LTU som utförare och NUTEK/VINNOVA och Stiftelsen Träenigheten som beställare fastställer programmets målsättning, organisation och programbudget samt parternas respektive åtagande. Enligt avtalet skall SkeWood-programmet inriktats mot egenskaper hos trä och förädling av trä med syfte att möta den träbearbetande industrins och dess slutkunders behov av forskning för att säkerställa en marknadsstyrd produkt- och processutveckling. Den forskning som utförs inom programmet ska således vara av relevans och intresse för den träbearbetande industrin och träbyggsektorn. De övergripande målen med verksamheten har varit: * att bygga upp och förstärka den existerande miljön för forskarutbildning vid LTU:s institution i Skellefteå så att den når en internationellt ledande position och * att bygga upp en forskningsverksamhet inom träbyggnadsområdet vid LTU:s institution för Väg- och Vattenbyggnad i Luleå. Verksamheten i programmet har omfattat tre delområden 1. Träkommunikation 2. Träbyggnad 3. Mätteknik Programmets måluppfyllelse skall, enligt programavtalet mätas såväl genom traditionella akademiska mått som genom industriell relevans. Som konkret mätbara mål angav man att Luleå tekniska universitet senast vid tidpunkten för upprättande av slutrapporten har: utbildat och examinerat 14 doktorer (därvid jämställs en doktorsexamen med två licentiatexamina), skrivit 60 artiklar och konferensbidrag, publicerat 24 artiklar i fackpressen, bildat en grupp för träindustriell mätteknik i Skellefteå som inom tre år från Huvudavtalets undertecknande ska ledas av en professor med tillsvidareanställning vid LTU och bildat en grupp för träbyggteknik i Luleå som inom tre år från Huvudavtalets undertecknande ska ledas av en professor med tillsvidareanställning vid LTU. NUTEK/VINNOVA och Intressenternas totala budgeterade åtaganden för hela programmet uppgick till 60 milj.kr varav NUTEK/VINNOVAS åtagande uppgick till 30 milj. kr och Intressenternas åtagande 30 milj. kr. Totalt har inom programmet 12 doktorer och 8 licentiater utexaminerats vilket motsvarar 16 doktorsekvivalenter. Det betyder att målet enligt avtalet är uppnått. Totalt har 56 artiklar i vetenskapliga tidskrifter, 55 konferensbidrag och 14 tekniska rapporter publicerats. Dessutom har programmet uppmärksammats en mängd gånger i olika facktidskrifter, dagstidningar och vid olika seminarier. LTU/Skellefteå och SP-Trätek i Skellefteå har arbetet inom området träindustriell mätteknik allt sedan mitten av 80-talet. Detta arbete har förts vidare inom SkeWoods delområde mätteknik. Nu när SkeWood-programmet avslutas, förs arbetet vidare inom TräCentrum Norrs delområde "Mätteknik och processtyrning för kundorderstyrd produktion i sågverk". Inför 2009 består forskargruppen inom mätteknikområdet av fyra professorer, två docenter, samt ytterligare sex lic/doktorer, en med internationella ögon betraktat mycket stark senior forskargrupp. Att forskningen inom området är av hög internationell klass manifesteras av att Anders Grönlund, Johan Oja och Stig Grundberg fick det prestigefulla Schweighoferpriset år 2007, för sitt arbete med att utveckla röntgentekniken till en industriellt fungerande teknik på sågverk. År 2000 skapades avdelningen för Träbyggnad (forskarutbildningsämne) som en delning från avdelningen för Stålbyggnad. Lars Stehn blev vetenskaplig ledare för ämnet och blev docent 2002 och professor 2004. Träbyggnad uppgraderades av LTU till forskningsämne (med fakultetsanslag), Lars Stehn sökte och erhöll professuren. Det var då den 1:a professuren inom ämnet träbyggnad i Sverige. Vid utgången av 2008 har LTU:s avdelning för träbyggnad 16 anställda, varav 9 doktorander och en omsättning på 11,6MSEK. Den akademiska produktionen har varit mycket stark. Sedan 2000 har sju doktorer och åtta licentiater examineras på Träbyggnad. Forskargruppen är nu ledande inom sitt område i Sverige. Att de projekt som genomförts inom programmet varit relevanta och intressanta för den träbearbetande industrin och träbyggsektorn har till stor del garanterats av att det krävts en femtioprocentig medfinansiering. Samtliga projekt har syftat till att lösa olika industrianknutna problem men tidsrymden från färdiga projektresultat till industriell implementering varierar naturligtvis mellan de olika projekten. Inom samtliga delområdena fortsätter samarbetet mellan akademi och industri inom ramen för TräCentrum Norr, Lean Wood Engineering och olika mål 2 projekt. Detta visar att industrin upplever att den forskning som byggts upp och bedrivs inom dessa områden är av stor relevans för företagen.TCN, LWE och mål 2 ger möjlighet till en fortsatt samverkan och kunskapsöverföring mellan industri och akademi enligt ett triple helix koncept. Sammanfattningsvis bör det framhållas att SkeWood har varit mycket värdefullt för uppbyggnad och vidareutveckling av den trärelaterade forskningen på LTU. Programmet har gjort det möjligt att bedriva en livskraftig forskarutbildning och har därigenom också gett en finansieringsbas för ett antal seniora forskare och därmed en forskningsmiljö som uppnått en godtagbar storlek.

  • 340.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    The Swedish stembank: an unique database for different silvicultural and wood properties1996In: First workshop "Connection between silviculture and wood quality through modelling approaches and simulation softwares": proceedings ; Hook, Sweden, June 13-17, 1994 / IUFRO WP S5.01-04 Biological Improvement of Wood Properties; Södra Timber / [ed] Gérard Nepveu, Nancy: INRA Editions, 1996Conference paper (Refereed)
  • 341.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Trapetssågning, vinkelsågning, fyrsågning: en jämförelse av volymsutbyte1987Report (Other academic)
  • 342.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Trapeze sawing: a method for conversion of small logs2003In: Proceedings of 16th International Wood Machining Seminar, Matsue, Japan, August 25 - 27 / [ed] Chiaki Tanaka, Matsue: Faculty of science and engineering, Shimane University , 2003Conference paper (Refereed)
  • 343.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Träbearbetning2004 (ed. 2 rev. utg)Book (Other academic)
  • 344.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Träbearbetning1986Book (Other academic)
  • 345.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Uppdatering av kunskaper om mottagarländernas tekniska krav på limmade produkter1986Report (Other academic)
  • 346.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Utbyte och produktionsteknik vid trapetssågning1987Report (Other academic)
  • 347.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Utbyte vid kapning i sågverk och trämanufakturindustri: förstudie1990Report (Other academic)
  • 348.
    Grönlund, Anders
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Yield for trapezoidal sawing and some other sawing methods1989In: Forest products journal, ISSN 0015-7473, Vol. 39, no 6, p. 21-24Article in journal (Refereed)
    Abstract [en]

    In this study, a comparison was made between the volume yield for the most common sawing method in Sweden (the cant sawing split taper method), and the yield produced by two rather new sawing methods. Yield was determined both by computer simulation and by manual optimum allocation. The study shows that when sawing small logs, trapezoidal sawing produces considerably higher yield than the other sawing methods. The trapezoidal method appears to show potential for the production of blanks for the millwork and furniture industries

  • 349.
    Grönlund, Anders
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Bernhardsson, Kjell
    Integrerad produktion av limmade ämnen1987Report (Other academic)
  • 350.
    Grönlund, Anders
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
    Björklund, L.
    Grundberg, Stig
    Berggren, G.
    Manual för furustambank1995Report (Other academic)
45678910 301 - 350 of 915
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