本欧洲标准规定,对于任何组成的胶合板,对称或不对称,计算一些机械性能(弯曲,张力,压缩,面板和平面剪切的强度和刚度)以及木材混合层的密度的计算方法。
注意通常,面板的叠层是对称的,但是经常地,表面的表面外观和背面的表面外观不同,因此各个薄板的机械性能之间的差异。因此,在这种情况下,组合物不是机械对称的,并且需要对称性独立的计算方法。
只要对层进行结构特征值,面板的结果值可以被用作EN 1995-1-1要求的特征值。
相反,附件A定义了根据EN 789和EN 1058的测试面板或根据EN 408进行的木材测试或EN 338中定义的值的弯曲,拉伸和压缩的单板属性的导出程序。
附件B提供了实用的电子表格,这是本标准主要部分中的方程式的应用。
附件C提供了根据附件B计算弯曲强度的示例
This European Standard specifies, for plywood panels of any composition, symmetrical or not, a calculation method to derive some mechanical properties (strength and stiffness in bending, tension, compression, panel and 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 surface appearance of the face and the surface appearance of the back face differ, hence a difference between the mechanical properties of the respective veneers. Therefore, in this case, the composition is not mechanically symmetrical and a symmetry independent calculation method is needed.
Provided that structural characteristic values are taken for the layers, the resulting values for the panels can be 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 and compression, either from testing panels according to EN 789 and EN 1058 or from timber testing according to EN 408 or from imposed values defined in EN 338.
Annex B provides practical spreadsheets, which are applications of the equations in the main part of this standard.
Annex C provide an example for the calculation of bending strength, in accordance with Annex B.
标准 | EN 14272:2011
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