Plywood design specification supplement 2 design and. Table specifications are provided with each table indicating conditions and assumptions used to calculate the loads. Structural timber design to eurocode 5, 2nd edition wiley. The introduction of mass produced glued laminated timber glulam, by otto hetzler 1, came to change this building materials advantages. In this format, the term resistance is used to refer to member capacities i. The tables in this data file provide recommended preliminary design loads for two of the most common glulam.
Design values lumber and timber nonnorth american sawn lumber structural glued laminated timber msr and mel nds 2005 supplement changes the nds supplement. Rosboro structural glued laminated timber rosboro, p. Standard practice for establishing allowable properties for. Design and construction 12795 west alameda parkway. 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. Therefore, the general requirements given in parts i, i1 and i11 of the specification are applicable to glued laminated timber except where indicated otherwise. This tool comprises geometry generation, member design, connection design, and generation of bim model components. Allowable stress design method for sawn lumber and glued. 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. These specifications contain data relating to design values and the adjustment of stresses for the design of glued laminated timber hardwood members. Design standards american institute timber construction. Part v of the specification contains provisions which. Pdf mechanical properties of gluedlaminated timber with.
Glued laminated timber, or glulam, is a highly innovative construction material. Structural glued laminated timbers are permitted to be made up a single grade of lumber or a combination of grades. Prgm lbl clear reg hyp x i i b pr rtn r bst rnd hyp 1 sin 1 cos 1 x 2 ln log % on f g rs s gsb r sst gto x y sin x cos e x 10 supplement 2 design and fabrication of glued plywoodlumber beams july 1992 s812,pds2. It will enable design engineers, architects and specifiers to use tabulated information relevant for timber construction. Chapter 1, gluedlaminated timber forest products laboratory. Standard specifications for structural glued laminated timber. Pdf glued laminated timber in architecture researchgate. These long length laminations are then face bonded together with adhesives to create the desired. Pdf structural glued laminated timber glulam is an engineered, stressrated. Abstract structural glued laminated timber glulam is an engineered, stressrated product that consists of two or more layers of lumber i. Because they are engineered products, glued laminated timbers are manufactured to meet a range of design stresses. Department of agriculture introduction the latest innovation in timber bridge design is the gluedlaminated panel deck. Although the requirements in aashto are based on the nds and other referenced specifications and. 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.
Plywood design specification apa the engineered wood association pse fr. 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. Like heavy timber, mass timber products have inherent. Standard for wood products structural glued laminated timber ansi a190. Shear strength of gluedlaminated timber beams and panels. 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.
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. 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. The rules given above are also applicable for a design according to din en 199511. Box 20, 2509 main street, springfield, or 97477 541 7468411. 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. Today, one of the exciting trends in building design is the growing use of mass timberi. Wisconsin ia operation with the university of wisconsin. The structure was erected in 1934 and is still in service today. Region 1 gluedlaminated timber stringer r1922 9,648 kb region 6 gluedlaminated timber stringer ra800 2,706 kb. Designing structural glued laminated timber for permanence 2002 view pdf. Detailed design information is given in the timber construction manual. Allowable stress design method glued laminated timber allowable stress calculation examples load combinations and the governing load duration factor r.
Design values for structural glued laminated timbers are established according to the analysis. 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. Ductile design of gluedlaminated timber beams request pdf. Development of specified strengths and modulus of elasticity for structural glued laminated timber. Department of agriculture introduction the latest innovation in timber bridge design is the glued laminated panel deck. Glued laminated timber glulam is an engineered wood product consisting of a number of layers of wood held together with a synthetic adhesive. The most common timber material used glued laminated timber glulam, was introduced. Properly manufactured glued iaminated timber demonstrates a balance in structural performance between the quality of. 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. Environmental product declaration glued laminated timber. Grade 24 gluedlaminated timber were designed according.
Design of tudor arches with structural glued laminated timber. One of the first glulam structures erected in the u. Laminated timber is a structural wood product made from strips of wood glued together. Handbook on structural timber design to eurocode 5 is en. Standard for dimensions of structural glued laminated timber. Glued laminated timber is a versatile engineered wood that is frequently specified for its strength, beauty and reliability. Cracking of glued laminated glulam timber is typically a result of either checking or delamination. Characteristic strength, stiffness and density properties for glued laminated timber made of beech of varying strength classes in nmm 2. Request pdf ductile design of gluedlaminated timber beams ductility is a fundamental component in the design of robust structures. Design criteria for large structural gluedlaminated timber.
Standard specifications for structural glued laminated timber of hardwood species. Asd and lrfd with the 2005 nds university of washington. The institution of structural engineerstrada 2007 manual for the design. 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. Code applications for traditional gluedlaminated timber and. Properly manufactured gluediaminated timber demonstrates a balance in structural performance between the quality of. Tuomi, engineer forest products laboratory,1 forest service u. Glued laminated timber glued laminated timber made of beech. Beam capacity tables american institute timber construction. Glulam a structural composite of lumber and adhesives. Factors affecting strengti1 and design principles of glued. Design of structural glued laminated timber columns, form y240.
Shear strength of gluedlaminated timber beams and panels douglas r. Simplified design procedure for gluedlaminated bridge decks by w. Guidelines for the analysis of drilled holes or notches in structural glued laminated timber beams 2002 view pdf. The most common timber material used glued laminated timber.
Glued laminated beam design tables lued laminated beams glulams are used in a wide range of applications in both commercial. Aitc capacity tables provide the uniformly distributed load that a glued laminated timber beam can support based on beam size, span and material properties. Fielding notching and drilling of glued laminated timber beams. Simplified design procedure for glued laminated bridge decks by w. 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 is made up of at least four strips or sheets of sawn goods, maximum 45 mm thick, with the grain direction running along the length of the laminated timber product. Structural glued laminated timber american wood council. It will enable design engineers, architects and specifiers to use tabulated information relevant for. Glulam design properties and layup combinations harvest timber. Increased design values, improved product performance, and cost competitiveness make glulam the superior choice for projects from simple. A significant development in the glulam industry was the introduction of fully waterresistant phenolresorcinol adhesive in 1942. The following information is provided for reference only.
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. 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. This presentation will focus on traditional gluedlaminated timber glt and innovative crosslaminated. 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. Structural glued laminated timber combinations generally utilize higher grade lumber in the outer zones than in the core. Gluelaminated timber glulam is a structural engineered wood element commonly used for beams and columns in residential and commercial applications. This is distinct from the term strength which refers to limit state. Computational design of glued laminated timber trusses. 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. Glued laminated timber, or glulam, is an engineered timber product manufactured by gluing together smaller pieces of stress graded and seasoned timber. Cracking of gluedlaminated glulam timber is typically a result of either checking or delamination. Shear strength of glued laminated timber beams and panels douglas r.
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