Glued laminated timber, also abbreviated glulam, is a type of structural engineered wood product constituted by layers of dimensional lumber bonded together with durable, moistureresistant structural adhesives. Tuomi, engineer forest products laboratory,1 forest service u. Figure 3 shows the zones of a uniformly loaded, simply supported beam where the field drilling of holes may be considered. Glued laminated timber bsh hasslacher norica timber. The tables in this data file provide recommended preliminary design loads for two of the most common glulam beam applications. In addition, a wide range of grades of both visually graded and mechanically graded lumber can be used in the manufacture of glulam. In addition, to minimize checking, specifications for glued laminated timber products should also require that the recommendations of aitc 1112005, recommended practice for protection of structural glued laminated timber during transit, storage, and erection are implemented. Gaps at the unglued edges of adjacent laminations and checks normally will not have a significant impact on.
Design standards american institute timber construction. Rosboro structural glued laminated timber rosboro, p. Glulam members are composed of individual pieces of dimension lumber. Environmental product declaration glued laminated timber. Code applications for traditional gluedlaminated timber.
Field notching and drilling of glued laminated timber beams number ews s560c june 1999 introduction glued laminated timber glulam beams are highly engineered components manufactured from specially selected and positioned lumber laminations of varying strength and stiffness properties. Be able to identify code acceptance of glued laminated timber and cross laminated timber. Wood is a material of hightech, but despite this, it has its disadvantages that can occur at any time. Structural glued laminated timbers glulam bearing the apa ews trademark are produced by members of engineered wood systems ews, a division of apa the engineered wood association. Department of agriculture introduction the latest innovation in timber bridge design is the glued laminated panel deck. Glued timber is a wood product which does not fulfil the laminated timber standards, but is made by gluing two or more items of sawn goods together. Through the 1980s, nearly ail glued laminated timber production was used domestically.
Often selected for aesthetic reasons or its unparalleled design flexibility, glulam also offers superior structural performance combined with long term durability. Glue laminated timber has almost the same load bearing capacity as steel, but a far lower weight and excellent fire resistance due to its charring characteristics. Glued laminated timber, or glulam, is a timber product manufactured from dimensional lumber, called laminating stock. Trail bridge catalog, gluedlaminated timber stringer. Annex b normative development of specified strengths and modulus of elasticity for structural glued laminated timber. Glued laminated timber glued laminated timber made of. Glulam is strengthgraded and refined by lamination. Glue laminated timber market size, share industry report. The portion of glue in a glulammember is less than 1%. Glued laminated timber is often used as a primary load carrying member of buildings.
Effective utilization of red maple lumber in gluedlaminated timber. Glued laminated timber glulam glulam is an engineered wood product, manufactured from layers of parallel timber laminations normally spruce or pine but occasionally more durable timber species such as larch, douglas fir or even hardwoods such as oak or sweet chestnut. Field notching and drilling of glued laminated timber beams. Gluelaminated timber glulam is a structural engineered wood element commonly used for beams and columns in residential and commercial applications. Rammer, forest products laboratory, usda forest service abstract five sizes of glued laminated timber beams and panels are being tested in a fivepoint beamshear test configuration to determine the shear strength capacity and size relationships.
A significant development in the glulam industry was the. Standard appearance grades for structural glued laminated timber. The pieces are endjointed together to produce long lengths that are then. Such products are used, as they are, in loadbearing construction and as blanks for various wood products such as window frames, laminated logs, etc. Glued laminated timber glulam is an engineered wood product consisting of a number of layers of wood held together with a synthetic adhesive. Cross laminated timber clt, one of the new mass timber products, is now. May have cracks, observed shrinkage and many other negative factors.
Bonding melamine resin adhesive with bright glue line, adhesive type i according to en 301 approved for bonding loadbearing and nonloadbearing timber components, both indoors and outdoors lamella thickness maximum lamella thicknesses. Many different species of lumber can be used to produce glued laminated timber. Structural glued laminated timber glulam is an engineered, stressrated product that consists of two or more layers of lumber i. Therefor its permissible bending strength is up to 50% higher than the permissible bending strength of the usually used solidwood. These glulam timbers are manufactured to conform with ansi standard a190. Code applications for traditional gluedlaminated timber and. Standard for preservative treatment of structural glued laminated timber. Shear strength and durability testing of adhesive bonds in cross. Arizona structural laminators your glulam beam specialists. Design stresses for these structural glulam timbers are established. Pdf elastic behavior of cross laminated timber and timber. Standard specifications for structural glued laminated timber. Timber engineering llctimber engineering llc fasce, fsei retired vice president, apa fetivpaitcformer executive vp, aitc. As glued laminated timber specialists we are thorough with every process to ensure the highest quality finished product.
The first stages of glulam manufacture are the same as those for the production of kiln kiln dried timber arriving at the manufacturing site is classified according to its strength properties. Discusses the uses of preservative treatments for the protection of glued laminated timber to resist decay. Chapter 2 manufacturing crosslaminated timber manufacturing. Topics discussed are design considerations, species of wood, types of preservative treatment, requirements for retention, penetration, certification and marking, incising, treatment prior to bonding, adhesives and bonding processes, fabrication and machining, care after.
Improve design knowledge on building systems made with new types of engineered wood products. This paper addresses the quality of the interface and edgebonded joints in layers of crosslaminated timber clt panels. Box 20, 2509 main street, springfield, or 97477 541 7468411. All of the drawings have been combined into one pdf and should only be used with a highspeed internet connection.
With a wide range of products the possibilities are endless. These noncritical zones are located in portions of the beam stressed to less than 50 percent of design. Glued laminated beam design tables lued laminated beams glulams are used in a wide range of applications in both commercial and residential construction. Growing sustainability concerns across the globe and mounting awareness among consumers about wood as a building material are likely to be the major driving forces for the market in the coming years. Field notching and drilling of glued laminated timber beams number ews s560h november 2014 introduction glued laminated timber glulam beams are highly engineered components manufactured from specially selected and positioned lumber laminations of varying strength and stiffness. Exterior surface of the crosslaminated timber is protected fire. This laminating stock lamstock comes in 2 nominal thickness and standard nominal widths although custom widths are.
Glulam is a highly visible form of mass timber in contemporary projects, with long spans framing signature designs that have been left exposed to take advantage of woods natural aesthetic. Glulam is an engineered wood product that optimizes the structural values of a renewable resourcewood. An export market was developed during the 1990s, and a substantial quantity of material is now shipped to. Glued laminated timber glulam or, when used as panels, glt glulam is composed of individual wood laminations dimension lumber, selected and positioned based on their performance characteristics and bonded together with durable, moistureresistant adhesives. Woodworks webinar d b 11 20december 11, 20 glued laminated timberglued laminated timber an innovative and versatile engineered wood compositeengineered wood composite product tom williamson, p. One of the first glulam structures erected in the u. Pieces of sawn timber are graded for strength, before being glued together. The following is a list of available pdf downloadable documents to assist owners and engineers in determining the proper structure for their needs. Shear strength of gluedlaminated timber beams and panels douglas r.
The following information is provided for reference only. Typically, such a deck consists of vertically laminated panels, up to 4 feet in width, which. Together with rubner holzbau, the manufacturer of the technology, the studio is attempting to move sports venues away from away from cement and tubular metal that either impact the environment negatively. Increased design values and improved product performance make this cost competitive material the natural choice for every project from garage door headers to floor beams. Rosboro structural glued laminated timber prl251 rosboro revised may 17, 2019 products. In north america, the material providing the laminations is termed laminating stock or lamstock. This engineering bulletin introduces the construction and connection details appropriate to open frame construction and provides a worked example for a dowelled glulam portal haunch connection. Structural glued laminated timbers are permitted to be made up a single grade of lumber or a combination of grades. The global glue laminated timber market, most commonly known as glulam, was valued at usd 4. Limited copies of this document in print or paper form may be distributed only to persons who are authorized by csa group to have such. Shear strength of structural glued laminated timber glulam beams may be affected. Glued laminated timber glulam beams have been reengineered to work better than ever in a host of residential and commercial construction applications. Glulam, a material of glue laminated timber, has been put forward as the future of green sports infrastructure by italian sports architect bear stadiums. The most common timber material used glued laminated timber glulam, was introduced.
Recommended practice for protection of structural glued laminated timber during transit, storage and erection. For the calculation of the relative slenderness for bending. Development of combinations of glued laminated timber utilizing coarsegrain southern pine lumber would result in better utilization of our forest resources. Design values for structural glued laminated timbers are established according to the analysis. Total annual production is approximately 300 million board feet. Gluelaminated timber put forward as future of sustainable. The structure was erected in 1934 and is still in service today. Become familiar with a number of technology advances and standards related to glued laminated timber and cross laminated timber. When used in heavy timber construction, glulam ensures high earthquake resistance and excellent resistance to aggressive substances.
Fielding notching and drilling of glued laminated timber. Cross laminated timber clt is an innovative structural system based on the use of largeformat, multilayered panels made from solid wood boards glued together, and. Structural glued laminated timber combinations generally utilize higher grade lumber in the outer zones than in the core. Cross laminated timber, timber panels with gaps, thick plate theory, homogenization.
Celebrating 35 years of being a proud supplier of quality engineered glued laminated timber products for the transportation industry. The characteristic strength, stiffness and density properties for glued laminated timber made of beech shall be taken from table 4. Shear strength of gluedlaminated timber beams and panels. Each of the materials individually in their own way.
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