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Engineered Wood Products and an Introduction to Timber Structural Systems

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Engineered Wood Products and an Introduction to Timber Structural Systems STRUCTURAL TIMBER 2 ENGINEERING BULLETIN Engineered wood products and an introduction to timber structural systems There are limitations on the maximum cross-sectional size and lengths of sawn timber that can be used as a structural component due to the availability of log sizes and the presence of naturally occurring defects in the timber (see Timber Engineering Notebook No. 1). These defects can be cut out and the timber reconstituted using engineered wood techniques such as finger jointing (Figure 1) to create longer lengths of timber of an assured strength grade, or laminating to form a homogeneous timber section. Combinations of timber or laminated sections with different materials such as Figure 1 wood-based boards or metal elements are used to create ‘engineered wood products’ Finger jointing of timber (EWPs) whose maximum size is limited only by manufacturing, handling and transportation constraints. In addition to engineered wood products, there are reconstituted board products which Table 1: Fibre size and beam types for timber products comprise smaller wood-based strands and fibres re-formed into panel products. These have structural applications but are also used extensively in the furniture-making and Timber Sawn timber sections packaging industries. Types of timber structural systems and their applications are also As cut from the tree DECREASING SIZE OF ORIGINAL WOOD MATERIAL introduced in this Notebook. Engineered Finger jointed lengths of timber wood Fabricated from smaller lengths Engineered wood products products of timber to form a longer (EWPs) element length EWPs including glued laminated timber, finger joints, plywood, stressed skin panels, mechanically and adhesive bonded web beams and connectored and nail plated trusses, Glulam and CLT have been in existence for at least 40 years. Small sections typically 25-45mm thick glued together to form a bigger Recently, there have been significant developments in the range of EWPs for structural beam or slab section applications with materials such as laminated veneer lumber (LVL), parallel strand lumber Veneers e.g. LVL or plywood (PSL), laminated strand lumber (LSL), prefabricated I-beams, metal web joists and Typically 2-4mm thick wood glued ‘massive’ or cross-laminated timber (CLT) becoming more widely available. together to form sections – both boards and beams These EWPs are typically manufactured by adhesively laminating together smaller softwood sections or laminates (e.g. glulam and CLT) or veneers or strands of timber Reconstituted Strands e.g. OSB wood slices (e.g. LVL, LSL and PSL). The varying performance of EWPs is influenced by the size of board Glued together to form sections wood component used in the product. At one end of the spectrum smaller sections of products – both boards and beams timber are laminated and finger jointed to form sections of glulam, whilst at the other end, Wood fibres reconstituted board products such as oriented strand boards (OSBs) and medium density Bonded to form sections – more fibre boards (MDFs) use small wood strands or fibres bonded together (Table 1). typically used for board products than beams e.g. particleboards and fibreboards www.structuraltimber.co.uk REV 0 - 23.10.14/EB002 STRUCTURAL TIMBER 2 ENGINEERING BULLETIN Figure 3 Softwood chords Use of I joists for a floor structure Plywood or OSB web Profiled metal webs Timber or LVL flange Figure 4 Open web joist Plywood Plywood is a flat panel made by bonding together, under pressure, a number of thin layers of veneers (or plies). Plywood was the first type of EWP to be widely available. The structural properties and strength of plywood depend mainly on the number, thickness, species and orientation of the plies. The structural grade plywoods that are commonly used in the UK construction industry are: • American construction and industrial plywood • Canadian softwood plywood Thin webbed joists (I joists) • Finnish birch-faced, birch and conifer plywoods. Birch plywood gives a good fair-faced finish and is readily persuaded I joists (Figure 2) are an EWP manufactured with flanges made from into curved profiles softwood or LVL with glued thin webs generally made from OSB, fibreboard • Swedish softwood plywood or plywood. I joists can be used to resist either flexural or axial loads or a combination of both (Figure 3). Plywoods are typically used for roof and floor decking applications and for wall sheathing boards. Metal web or open web joist Plywood for structural applications should be specified as “having Open web joists are shallow parallel-chord trusses manufactured using exterior glue bond to BS EN 314-2 and veneers in compliance with BS EN similar techniques to that used for trussed rafters comprising a member 636:2003”. This replaces the previous definition for the plywood of WBP with flanges (or chords) usually made from softwood and with metal or exterior grade where ‘WBP’ describes the properties of the adhesive and timber strutting to form the webs (Figure 4). ‘exterior grade’ describes the durability of the outer veneers. The chords (and webs where timber webs are used) are generally planed The characteristic strength and stiffness values for plywood for use in softwood graded in accordance with BS EN 14081-1. The strength class structural design are contained in BS EN 12369-2:2004. of the timber is usually C27 in accordance with BS EN 338:2009 or TR26 (whose characteristic strength values are equal to that of C27 but whose Laminated veneer lumber characteristic stiffness values are taken from BS5268-2:2002). The depth of Laminated veneer lumber (LVL) is a structural member manufactured by the chords is generally 47mm and their widths range from 72mm to 145mm. bonding together thin vertical softwood veneers with their grain parallel to Metal webs are typically profiled, nominal 1mm galvanised light gauge steel the longitudinal axis of the section, under heat and pressure. In some cases with a zinc coating specification of Z275. cross grain veneers are incorporated to improve dimensional stability. Open web joists are principally used as a roof or floor joist element. They are LVL is often used for high load applications to resist either flexural or axial often preferred to I-joists as they allow a combined services and structural loads or a combination of both. It can provide both panels and beam/column zone. elements. The requirements for LVL are contained in product standard BS EN www.structuraltimber.co.uk 14374:2004. REV 0 - 23.10.14/EB002 2 STRUCTURAL TIMBER 2 ENGINEERING BULLETIN Laminated strand lumber Laminated strand lumber (LSL) is a structural member made by cutting long thin strands approximately 300mm long and 0.8mm - 1.3mm thick directly from de-barked logs. The strands are blended, coated with adhesive and oriented so that they are essentially parallel to the longitudinal axis of the section before being reformed by steam-injection pressing into a solid section. LSL is used in similar applications to LVL. Parallel strand lumber Parallel strand lumber (PSL) is a structural member made by cutting long Figure 5 Figure 6 thin strands (typically 3.2mm thick, 20mm wide and up to 3.0m long) from Connections in curved,vertically Cross laminated timber timber veneers. The strands are oriented so that they are essentially parallel laminated glulam to the longitudinal axis of the section before being coated with adhesive and Table 2: Characteristic strength, stiffness and density properties for some EWPs fed into a continuous press and microwave-cured. PSL is used in similar applications to LVL. LSL and PSL have recently become less widely available in the UK due to a preference for LVL and supply chain considerations. Glued laminated timber Glued laminated timber (glulam) is a structural member made by gluing together a number of graded timber laminations with their grain parallel to the longitudinal axis of the section. Members can be straight or curved, horizontally or vertically laminated and can be used to create a variety of structural forms (Figure 5). Laminations are typically 25mm or 45mm thick but smaller laminations may be necessary where tightly curved or vertically laminated sections are use glue or nails. Fabricated from softwood timber posts connected with required. hardwood timber dowels, the system works by using dowels with a moisture The requirements for the manufacture of glulam are contained in product content lower than that of the posts. Over time, the dowels expand to achieve standard BS EN 14080: 2013. moisture equilibrium, thus ‘locking’ the posts together and creating a structural load-bearing panel system. CLT should be designed using the Cross laminated timber principles given in BS EN 1995-1-1 and -1-2 together with data from the manufacturer of the product. Cross laminated timber (CLT) is a structural timber product with a minimum of three cross-bonded layers of timber, of thickness 6mm to 45mm, strength Table 2 illustrates the properties of a variety of EWPs. graded to BS EN 14081-1:2005 and glued together in a press which applies pressure over the entire surface area of the panel. Reconstituted wood-based board products CLT panels typically have an odd number of layers (3,5,7,9) which may be Reconstituted board products are typically manufactured by combining of differing thicknesses but which are arranged symmetrically around the smaller wood strands or fibres with adhesive. There is a structural penalty middle layer with adjacent layers having their grain direction at right angles when timber is modified from a sawn product to small strands and fibres to one another (Figure 6). used in board products, as the effects of creep increase as the amount of glue used to join the smaller wood elements increases. The structural benefits of CLT over conventional softwood wall framing and joisted floor constructions, include: The design of reconstituted timber board materials takes the resulting reduced performances into account by the use of relatively low values for • large axial and flexural load-bearing capacity when used as a wall or slab the factor kmod in BS EN 1995-1-1 Table 3.1 for OSB, particleboards and • high in-plane shear strength when used as a shear wall fibreboards.
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