BS EN 14272:2011 pdf free.Plywood —Calculation methodfor some mechanical properties.
BS EN 14272 This European Standard specifies, for plywood panels of any composition, symmetrical or not, a calculationmethod to derive some mechanical properties (strength and stiffness in bending, tension, compression, paneland planar shear) as well as density from the wood compounding the layers.
NOTE Usually, the lay-up of the panels is symmetrical but, very often, the surtace appearance of the face and thesurtace appearance of the back face differ， hence a difference between the mechanical properties of the respectiveveneers. Therefore, in this case, the composition is not mechanically symmetrical and a symmetry independent calculationmethod is needed.
Provided that structural characteristic values are taken for the layers, the resulting values for the panels canbe used as characteristic values as required by EN 1995-1-1.
Conversely，Annex A defines the procedures to derive the veneer properties,in bending，tension andcompression, either from testing panels according to EN 789 and EN 1058 or from timber testing according toEN 4o8 or from imposed values defined in EN 338.
Annex B provides practical spreadsheets，which are applications of the equations in the main part of thisstandard.
Annex C provide an example for the calculation of bending strength, in accordance with Annex B.
The following referenced documents are indispensable for the application of this document. For datedreferences，only the edition cited applies.For undated references,the latest edition of the referenceddocument (including any amendments) applies.
EN 325,Wood-based panels — Determination of dimensions of test piecesEN 338:2009,Structural timber -Strength classes
EN 384,Structural timber —Determination of characteristic values of mechanical properties and density
EN 408,Timber structures — Structural timber and glued laminated timber —Determination of some physicaland mechanical properties
EN 789,Timber structures — Test methods —Determination of mechanical properties of wood based panelsEN 1058,Wood-based panels — Determination of characteristic 5-percentile values and characteristic meanvalues
EN 12369-2, Wood-based panels — Characteristic values for structural design— Part 2 Plywood.BS EN 14272 pdf download.