Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 7 views

    Timber Properties

    Uploaded by

    val mejia
    This document provides characteristic properties for various types of timber, including strength, modulus of elasticity, density, and shear modulus. It lists values for softwoods, glulam, plywood, oriented strand board (OSB), laminated veneer lumber (LVL), and cross-laminated timber. The properties vary depending on the timber type, strength class, orientation, and whether measuring planar or panel properties. Densities range from 310-750 kg/m3 and modulus of elasticity ranges from 4930-13800 N/mm2 depending on the specific timber.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Timber Properties

    Uploaded by

    val mejia
    7 views2 pages
    This document provides characteristic properties for various types of timber, including strength, modulus of elasticity, density, and shear modulus. It lists values for softwoods, glulam, plywood, oriented strand board (OSB), laminated veneer lumber (LVL), and cross-laminated timber. The properties vary depending on the timber type, strength class, orientation, and whether measuring planar or panel properties. Densities range from 310-750 kg/m3 and modulus of elasticity ranges from 4930-13800 N/mm2 depending on the specific timber.

    Original Description:

    Original Title

    Timber properties

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    This document provides characteristic properties for various types of timber, including strength, modulus of elasticity, density, and shear modulus. It lists values for softwoods, glulam, plywood, oriented strand board (OSB), laminated veneer lumber (LVL), and cross-laminated timber. The properties vary depending on the timber type, strength class, orientation, and whether measuring planar or panel properties. Densities range from 310-750 kg/m3 and modulus of elasticity ranges from 4930-13800 N/mm2 depending on the specific timber.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    7 views2 pages

    Timber Properties

    Uploaded by

    val mejia
    This document provides characteristic properties for various types of timber, including strength, modulus of elasticity, density, and shear modulus. It lists values for softwoods, glulam, plywood, oriented strand board (OSB), laminated veneer lumber (LVL), and cross-laminated timber. The properties vary depending on the timber type, strength class, orientation, and whether measuring planar or panel properties. Densities range from 310-750 kg/m3 and modulus of elasticity ranges from 4930-13800 N/mm2 depending on the specific timber.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    266    Structural Engineer’s Pocket Book

    Selected characteristic properties for timber


    Modulus of elasticity Density
    Bending Tension Mean 5th Mean Mean
    parallel parallel Tension Compression Compression Shear parallel percentile percentile shear
    to grain to grain perpendicular parallel to perpendicular parallel to to grain parallel to to grain modulus Mean
    Strength fm,k ft,0,k to grain ft,90,k grain fc,o,k to grain fc,90 k grain fv,k E0,05 grain E0,05 E90, mean G mean P mean Minimum
    class (N/mm2) (N/mm2) (N/mm2) (N/mm2) (N/mm2) (N/mm2) (N/mm2) (N/mm2) (N/mm2) (N/mm2) (kg/m3) Pk (kg/m3)
    Softwood
    C16 16 10 0.50 17.0 2.2 1.8 8000 5400 270 500 370 310
    C24 24 14 0.50 21.0 2.5 2.5 11000 7400 370 690 420 350
    D40 40 24 0.60 26.0 8.3 4.0 13000 10900 860 810 550 660
    D50 50 30 0.60 29.0 9.3 4.0 10900 11800 930 880 620 750
    Glulam
    GL28c 28 19.5 0.45 26.5 3.0 3.2 12600 10200 420 780 410 –
    GL28h 28 16.5 0.40 24.0 2.7 2.7 12600 10200 390 720 380 –
    Finish ply
    Birch – Birch
    9 mm 45.6 (32.1)c 40.8 34.2 28.3 23.7 Planar 2.67 11395 – 6105 Planar 155f 680 630
    12 mm 42.9 (33.2) 40.0 35.0 27.7 24.3 Panel 9.5 10719 – 6781 Panel 620 680 630
    18 mm 40.2 (34.1) 39.2 35.8 27.2 24.8 10048 – 7452 680 630

    Conifer
    9 mm 26.0 (18.3) 15.2 12.8 19.6 16.4 Planar 2.67 8465 – 4535 Planar 52 520 460
    12 mm 24.5 (19.0) 14.9 13.1 19.2 16.8 Panel 9.5 7963 – 5037 Panel 530 520 460
    18 mm 23.0 (19.5) 14.6 13.4 18.8 17.2 7464 – 5536 520 460
    OSB 2/3 16.4 9.4 7.0 15.4 12.7 Planar 1.0 4930 4190 1980 Planar 50 550 –
    Panel 6.8 Panel 1080
    LVL
    Kerto S Planar 50.0 35.0 0.8 35.0 Planar 1.8 Planar 2.3 13800 11600 Planar 130 600 510 480
    Panel 44.0 Panel 6.0 Panel 4.1 Panel 430
    Kerto Q
    (27–69 mm) Planar 36.0 26.0 6.0 26.0 Planar 1.8 Planar 1.3 10500 8800 Planar 130 600 510 480
    Panel 32.0 Panel 9.0 Panel 4.5 Panel 2400
    Cross-lami­
    nated timber
    Planar 24.0 – 0.12 – 2.7 2.7 (1.5)i 12000 – 370 690 (50)i 500 450
    Panel 23.0 16.5 – 30.0 24.0 5.2 12000 – – 250 500 450
    Notes:
    a The moisture contents for service classes are: class 1 ≤12%, class 2 ≤20% and class 3 >20%. Class 1 is generally warm/internal timber; class 2 is cold/sheltered/uninsu-
    lated timber and class 3 is external/unsheltered. Timber type, preservation and detailing should be carefully selected for class 3.
    b Mean density is used to calculate weight and minimum density is used to calculate mechanical fastener strengths. Minimum is also referred to as ‘characteristics’ density

    in BS EN 1995.
    c Plywood bending strengths in brackets refer to perpendicular to the (face) grain.
    d Planar properties refer to the ‘flat’ dimension and concern rolling shear. Panel properties refer to the ‘on edge’ orientation.
    e E values for tension and compression are available in manufacturer’s literature but are omitted for clarity.
    f Shear modulus, G, figures are quoted as perpendicular to the grain. Slightly higher values are available for parallel to the grain.
    g Kerto LVL by Metsawood: Kerto S for beams/long spans or Kerto Q for stability/compressive strength.
    h As at 2012 no characteristic values for North American plywood were available for use with Eurocodes. There is no timetable for their release. The North American

    Timber and Plywood     267


    Plywood Associations advised that the only design values available were for use with BS 5628.
    i Cross-laminated timber values by KLH Ltd. Values in brackets refer to properties perpendicular to the grain of the outer lamella.

    Source: BS EN 338:2009. Table 1; BS EN 12369. 2001. Part 1. Table 2; Metsawood (2012). Finnish Plywood Association. 2012.

    You might also like