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Bending edgewise: Bending flatwise:

Shear edgewise: Shear flatwise:/vflatk , and G0

Bending edgewise: Bending flatwise:

Shear edgewise: Shear flatwise:/vflatk , and G0

Compression

Compression or tension PeiPendicular to gram ii i... • flatwise: /tooflatk parallel to grain: ^w^k fc,o,k and fa edgewise: ft'90'^ge'K

Compression

Compression or tension PeiPendicular to gram ii i... • flatwise: /tooflatk parallel to grain: ^w^k fc,o,k and fa edgewise: ft'90'^ge'K

Fig. 1.12. TimberStrand (LSL), courtesy of Weyerhaeuser (iLevel TrusJoist).

Fig. 1.13. Parallam (PSL) - manufacturing process and in construction; photos (a) and (b) courtesy of Weyerhaeuser (iLevel TrusJoist).

Fig. 1.14. OSB: (a) production before the press (photo courtesy of Wikipedia Foundation); (b) and (c) OSB boards and wall panels; (d) OSB webs in I-joists.

Fig. 1.14. OSB: (a) production before the press (photo courtesy of Wikipedia Foundation); (b) and (c) OSB boards and wall panels; (d) OSB webs in I-joists.

• OSB/2 is a general purpose (unconditioned) load-bearing panel for use in dry conditions only (service class 1).

• OSB/3 is a load-bearing structural panel for use in humid conditions (service classes 1 or 2).

• OSB/4 is a heavy-duty load-bearing structural panel for use in humid conditions (service classes 1 and 2).

OSB/3 and OSB/4 grades are intended for use in design and construction of load-bearing or stiffening building elements such as walls, flooring, roofing and I-beams. BS EN 12369-1:2001 gives the minimum characteristic values for OSB complying with EN 300:1997, which are summarised in Table 1.17.

1.7.7 Particleboards and fibre composites

Particle and fibre composites are usually available in panel form and are widely used in housing construction and furniture manufacture. There are several products in this

Table 1.17 Strength and stiffness properties and density values for OSB boards complying with EN 300: 1997 (based on BS EN 12369-1:2001)

Section properties

Characteristic strength (N/mm2)

Characteristic

Density

(kg/m3)

Mean modulus of rigidity (N/mm2)

Mean modulus of elasticity (N/mm2 )

Bending

Compression

Tension

Planar Panel (rolling) shear shear

Panel Planar shear shear

Bending

Tension

Compression

Thickness (mm)

/rn.O.k /m,90,k

/c,0,k /c,90,k

/t,0,k /t,90,k

fy, k /r,k

Pk

^v.mean ^r.mean

-^m.O.mean ^m, 90, mean

-^t,0,mean -^t,90,mean

-^c,0,mean -^c,90,mean

OSB/2: load-bearing boards for use in dry conditions; OSB/3: load-bearing boards for use in humid conditions

> 6-10

0 0

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