Plywood Design Fundamentals - Canadian Plywood Association

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2012_april revised_48945_en_design.qxd 19/04/2012 3:04 PM Page 18 Table 15. Specified Strength Capacities per unit width for Canply EXTERIOR EaSy T&G plywood Plywood Type DFP CSP or Aspen Plywood Type DFP CSP or Aspen Plywood Product EASY T&G EASY T&G Plywood Product EASY T&G EASY T&G Nominal Plywood Thickness (mm) 11.0 11.0 12.5 15.5 18.5 18.5 18.5 20.5 20.5 20.5 11.0 12.5 15.5 18.5 18.5 18.5 20.5 20.5 20.5 Table 15. Specified Stiffness and Rigidity Capacities per unit width for Canply EXTERIOR EaSy T&G plywood (concluded) Nominal Plywood Thickness (mm) 11.0 11.0 12.5 15.5 20.5 20.5 20.5 11.0 12.5 15.5 20.5 20.5 20.5 Note: 1. Dry service conditions Number of Plies Number of Plies 3 4 4 5 5 6 7 3 4 5 5 6 7 certiWood Canply plywood Design Fundamentals Bending (m p ) N•mm/mm 0° 410 380 470 770 1 200 1 200 1 200 370 430 520 840 850 840 0° 90° 85 91 150 280 740 610 560 85 150 280 740 610 560 1 500 000 1 400 000 1 900 000 3 000 000 6 300 000 6 800 000 6 200 000 1 000 000 1 300 000 2 000 000 4 300 000 4 600 000 4 300 000 Axial tension (t p ) N/mm 0° 150 120 120 130 180 150 160 110 90 110 150 120 140 Notes: 1. specified strength in bearing (normal to plane of plies) q p =4.5MPa 2. Dry service conditions 3. standard term duration of load 18.5 18.5 18.5 18.5 18.5 18.5 3 4 4 5 5 6 7 5 6 7 3 4 5 5 6 7 5 6 7 5 6 7 5 6 7 1 300 1 100 1 100 880 750 740 460 480 450 460 480 450 6 000 000 5 300 000 4 900 000 4 100 000 3 600 000 3 400 000 200 160 160 160 130 140 90° 34 45 58 71 130 130 110 34 58 71 130 130 110 Bending Stiffness Axial Stiffness in (bb =EI) tension or compression N•mm (ba =EA) N/mm Orientation of Applied Force Relative to Face Grain 2 /mm 58 000 110 000 220 000 630 000 2 600 000 2 400 000 2 000 000 58 000 220 000 630 000 2 600 000 2 400 000 2 000 000 18 Axial compression (p p ) N/mm 0° 190 150 160 170 260 200 210 230 200 210 120 100 120 170 140 160 90° 60 79 100 79 150 150 120 60 100 79 150 150 120 0° 110 000 86 000 89 000 95 000 130 000 110 000 120 000 71 000 60 000 72 000 100 000 83 000 95 000 Shearthroughthickness (v p ) 0° & 90° 30 28 31 36 48 47 27 30 38 46 51 51 51 Bending (v pb ) N/mm Orientation of Applied Force Relative to Face Grain 90° 110 89 110 110 89 110 1 300 000 1 500 000 1 300 000 1 300 000 1 500 000 1 300 000 180 140 160 120 99 120 120 99 120 140 000 110 000 120 000 110 000 84 000 95 000 45 43 47 46 46 51 0° 5.6 4.5 5.2 9.4 11 8.2 9.7 10 9.2 11 5.6 5.2 9.4 11 8.2 9.7 10 9.2 11 90° 36 000 47 000 60 000 47 000 73 000 59 000 71 000 89 000 89 000 71 000 36 000 60 000 47 000 73 000 59 000 71 000 89 000 89 000 71 000 Planar Shear 90° 1.7 2.3 2.9 4.9 5.7 5.1 7.1 5.6 5.8 5.5 1.7 2.9 4.9 5.7 5.1 7.1 5.6 5.8 8.5 Shear in-plane (v pf ) MPa 0° 0.72 0.55 0.55 0.72 0.72 0.55 0.72 0.55 0.55 0.72 0.72 0.55 0.72 0.72 0.55 0.72 0.55 0.55 0.72 Shear-Through- Thickness Rigidity (bv ) N/mm 0° & 90° 6 900 6 500 7 200 8 400 10 000 9 800 9 800 11 000 11 000 11 000 5 000 5 700 7 100 8 600 8 600 8 600 9 500 9 500 9 500 90° 0.72 0.72 0.72 0.72 0.72 0.55 0.72 0.55 0.55 0.72 0.72 0.72 0.72 0.72 0.55 0.72 0.55 0.55 0.72
2012_april revised_48945_en_design.qxd 19/04/2012 3:04 PM Page 19 Table 16. load Duration Factor (K D ) Duration of loading Short Term Standard Term Permanent K D 1.15 1.00 0.65 19 Explanatory Notes Short term loading means that condition of loading where the duration of the specified loads is not expected to last more than seven days continuously or cumulatively throughout the life of the structure. Examples include wind loads, earthquake loads, falsework and formwork as well as impact loads. Standard term means that condition of loading where the duration of specified loads exceeds that of short term loading, but it is less than permanent permanent loading. Examples include snow loads, live loads due to occupancy, wheel loads on bridges and dead loads in combination with all of the above. Permanent duration means that condition of loading under which a member is subject to more or less continuous specified load. Examples include dead loads plus live loads of such character that they are imposed on the members for as long a period of time as the dead loads themselves. Such loads include those usually occurring in tanks or bins containing fluids or granular material, loads on retaining walls subject to lateral pressure such as earth, floor loads where the specified load may be expected to be continuously applied such as those in buildings for storage of bulk materials. Loads due to fixed machinery should be considered permanent. Notes: 1. Duration of load may require professional judgement by the designer. explanatory notes in this table provide guidance to designers about the types of loads and load combinations for which each modification factor should be applied to tabulated specified strengths, in accordance with CsA O86 engineering Design in Wood. 2. For standard term loads where D is greater than L, the permanent load factor may be used, or the factor may be calculated as: ( ) KD =1.0-0.50 log D > 0.65 L where L = specified live load D = specified dead load 3. When the total specified load is made up of loads acting for different durations, the design shall be based on the most severe combination. The appropriate load duration factor shall be taken into account for each load combination. Table 17. Service Condition Factor (K S) Property to be Modified Specified Strength Specified Stiffness and Rigidity Service Condition Dry 1.0 1.0 Table 18. Stress Joint Factor (X J) for Butt Joints Unsanded Plywood Thickness (mm) 7.5 9.5 12.5 15.5 to 20.5 Minimum Length of Splice Plate Perpendicular to Joint (mm) 200 300 350 400 Wet 0.80 0.85 Tension Splice Plate Compression One Both and Shear Side Sides 0.67 0.85 1.0 0.67 0.85 1.0 0.67 0.85 1.0 0.50 0.85 1.0 Table 19. Stress Joint Factor (X J) for Scarf Joints Slope of Scarf 1:12 1:10 1:8 1:5 Tension 0.85 0.80 0.75 0.60 Compression 1.0 1.0 1.0 1.0 Shear 1.0 1.0 1.0 Not allowable certiWood Canply plywood Design Fundamentals
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Plywood Design Fundamentals - Canadian Plywood Association

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