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. Glued laminated beam design tables lued laminated beams glulams are used in a wide range of applications in both commercial. Designing structural glued laminated timber for permanence 2002 view pdf. Development of specified strengths and modulus of elasticity for structural glued laminated timber. Structural glued laminated timber american wood council. Aitc capacity tables provide the uniformly distributed load that a glued laminated timber beam can support based on beam size, span and material properties. Glued laminated timber, or glulam, is a highly innovative construction material. Standard for dimensions of structural glued laminated timber. Part v of the specification contains provisions which. A significant development in the glulam industry was the.
Standard specifications for structural glued laminated timber of hardwood species. Computational design of glued laminated timber trusses. Abstract structural glued laminated timber glulam is an engineered, stressrated product that consists of two or more layers of lumber i. Handbook on structural timber design to eurocode 5 is en. Cracking of glued laminated glulam timber is typically a result of either checking or delamination. Rosboro structural glued laminated timber prl251 rosboro revised may 17, 2019 products. Plywood design specification apa the engineered wood association pse fr. Code applications for traditional gluedlaminated timber and. This is distinct from the term strength which refers to limit state. Cracking of gluedlaminated glulam timber is typically a result of either checking or delamination.
It will enable design engineers, architects and specifiers to use tabulated information relevant for. Characteristic strength, stiffness and density properties for glued laminated timber made of beech of varying strength classes in nmm 2. Design criteria for large structural gluedlaminated timber. The rules given above are also applicable for a design according to din en 199511.
Plywood design specification supplement 2 design and. Glued laminated timber glued laminated timber made of beech. The material is made up of several layers of structural timber that have been bonded together using adhesives in order to form a bigger, potentially enormous piece of wood. Request pdf ductile design of gluedlaminated timber beams ductility is a fundamental component in the design of robust structures. Design and construction 12795 west alameda parkway. Simplified design procedure for gluedlaminated bridge decks by w. Design of tudor arches with structural glued laminated timber. Wisconsin ia operation with the university of wisconsin.
Although the requirements in aashto are based on the nds and other referenced specifications and. Properly manufactured glued iaminated timber demonstrates a balance in structural performance between the quality of. Included are the allowable stresses for bending, tension and compression parallel to the grain, horizontal shear, compression perpendicular to the grain, and radial tension and compression in curved members. Allowable stress design method glued laminated timber allowable stress calculation examples load combinations and the governing load duration factor r. Tuomi, engineer forest products laboratory,1 forest service u. T e c h n i c a l n o t e field notching and drilling of glued laminated timber beams number ews s560g june 2010 introduction glued laminated timber glulam beams are highly engineered components manufactured from specially selected and. Shear strength of gluedlaminated timber beams and panels douglas r. Glued laminated timber manufacture of glued laminated timber the manufacture of glued laminated timber must follow recognized national standards to justify the specified engineering design values assigned to it.
Pdf mechanical properties of gluedlaminated timber with. The structure was erected in 1934 and is still in service today. In this format, the term resistance is used to refer to member capacities i. Simplified design procedure for glued laminated bridge decks by w. 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. Glued laminated timber glt is characterized by a high structural capacity, appealing aesthetics and free shaping possibilities afforded by the use of timber construction parts.
Design values lumber and timber nonnorth american sawn lumber structural glued laminated timber msr and mel nds 2005 supplement changes the nds supplement. These long length laminations are then face bonded together with adhesives to create the desired. Standard for wood products structural glued laminated timber ansi a190. 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. Region 1 gluedlaminated timber stringer r1922 9,648 kb region 6 gluedlaminated timber stringer ra800 2,706 kb. Erected at the forest products laboratory in madison, wisconsin, in 1934, this building is one of the first constructed with glued laminated timber arches designed and built using engineering principles. Gluedlaminated timber manufacture of gluedlaminated timber the manufacture of gluedlaminated timber must follow recognized national standards to justify the specified engineering design values assigned to it. Structural glued laminated timber combinations generally utilize higher grade lumber in the outer zones than in the core. Ductile design of gluedlaminated timber beams request pdf. Grade 24 gluedlaminated timber were designed according. The most common timber material used glued laminated timber glulam, was introduced. Structural timber design to eurocode 5, 2nd edition wiley. Therefore, the general requirements given in parts i, i1 and i11 of the specification are applicable to glued laminated timber except where indicated otherwise.
Allowable stress design method for sawn lumber and glued. Design standards american institute timber construction. Chapter 1, gluedlaminated timber forest products laboratory. Table specifications are provided with each table indicating conditions and assumptions used to calculate the loads.
Design values for structural glued laminated timbers are established according to the analysis. Because they are engineered products, glued laminated timbers are manufactured to meet a range of design stresses. This tool comprises geometry generation, member design, connection design, and generation of bim model components. The most common timber material used glued laminated timber. Standard practice for establishing allowable properties for. Shear strength of glued laminated timber beams and panels douglas r. Increased design values, improved product performance, and cost competitiveness make glulam the superior choice for projects from simple. The introduction of mass produced glued laminated timber glulam, by otto hetzler 1, came to change this building materials advantages. Rosboro structural glued laminated timber rosboro, p. Detailed design information is given in the timber construction manual.
Glued laminated timber, or glulam, is an engineered timber product manufactured by gluing together smaller pieces of stress graded and seasoned timber. Factors affecting strengti1 and design principles of glued. Pdf glued laminated timber in architecture researchgate. Structural glued laminated timbers are permitted to be made up a single grade of lumber or a combination of grades. The early development of design values for glued laminated timber paralleled that for visually graded lumber see history at the beginning of the commen tary. Asd and lrfd with the 2005 nds university of washington. 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. It will enable design engineers, architects and specifiers to use tabulated information relevant for timber construction. The institution of structural engineerstrada 2007 manual for the design. Structural gluedlaminated timber is one of the oldest engineered wood products. Pdf structural glued laminated timber glulam is an engineered, stressrated. Department of agriculture introduction the latest innovation in timber bridge design is the gluedlaminated panel deck.
A significant development in the glulam industry was the introduction of fully waterresistant phenolresorcinol adhesive in 1942. Glued laminated timber is a versatile engineered wood that is frequently specified for its strength, beauty and reliability. Design values for wood construction, an integral part of the nds, has also been updated to provide the latest design values for lumber and glued laminated timber. Pound for pound, glulam is stronger than steel and has greater strength and stiffness than comparably sized dimensional lumber. 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. Structural glued laminated timber glulam is an engineered, stressrated product that consists of two or more layers of lumber i. Glulam a structural composite of lumber and adhesives. Like heavy timber, mass timber products have inherent. Guidelines for the analysis of drilled holes or notches in structural glued laminated timber beams 2002 view pdf. The tables in this data file provide recommended preliminary design loads for two of the most common glulam.
Shear strength of gluedlaminated timber beams and panels. Standard specifications for structural glued laminated timber. Glulam design properties and layup combinations introduction glued laminated timbers glulam are manufactured by end joining individual pieces of dimension lumber or boards together with structural adhesives to create long length laminations. When it becomes necessary to cut a small notch in the top of a glued laminated timber in the compression zone to provide passage for small diameter pipe or conduit, this cut should be made in areas of the beam stressed to less than 50 percent of the design bending stress. Beam capacity tables american institute timber construction. The following information is provided for reference only. Environmental product declaration glued laminated timber.
Today, one of the exciting trends in building design is the growing use of mass timberi. These specifications contain data relating to design values and the adjustment of stresses for the design of glued laminated timber hardwood members. Box 20, 2509 main street, springfield, or 97477 541 7468411. Rammer, forest products laboratory, usda forest service abstract five sizes of gluedlaminated timber beams and panels are being tested in a fivepoint beamshear test configuration to determine the shear strength capacity and size relationships. Glulam design properties and layup combinations harvest timber. All of the drawings have been combined into one pdf and should only be used with a highspeed internet connection. Glued laminated timber glulam is an engineered wood product consisting of a number of layers of wood held together with a synthetic adhesive.
Properly manufactured gluediaminated timber demonstrates a balance in structural performance between the quality of. Department of agriculture introduction the latest innovation in timber bridge design is the glued laminated panel deck. Laminated timber is a structural wood product made from strips of wood glued together. The first building in the united states to use structural glued laminated timber was max hanisch home at crooked lake wi, and then a school gymnasium in peshtigo. Design of structural glued laminated timber columns, form y240. One of the first glulam structures erected in the u.
1081 1284 653 1398 359 1168 1060 723 383 1026 1078 1238 502 604 756 1519 1387 1032 1305 1254 1227 246 794 823 1437 966 1232 1390 21 868 1006 1397 572 1032 777 903 30 835 194 694