Structural timber - Determination of characteristic values of mechanical properties and density
结构木材.机械性能和密度特征值的测定
发布日期:
2018-11-21
实施日期:
2018-11-21
本欧洲标准提供了一种确定机械分级结构木材的视觉等级和\/或强度等级的规定总体的机械性能和密度特征值的方法。此外,它还包括采样、测试、分析和数据呈现的各个阶段。本标准提供了从无缺陷试样试验中得出结构木材强度、刚度和密度特性的方法。根据本标准确定的机械性能和密度值适用于将等级和种类分配给EN 338的强度等级。注1:对于将等级和种类分配给EN 338中的强度等级,只需根据试验数据确定三种特性,即弯曲或拉伸强度、弯曲或拉伸时平行于晶粒的弹性模量和密度,其他特性可根据表2计算。注2 EN 1912给出了指定给强度等级的既定视觉等级的示例。
This European Standard gives a method for determining characteristic values of mechanical properties and density, for defined populations of visual grades and/or strength classes of machine graded structural timber. Additionally it covers the stages of sampling, testing, analysis and presentation of the data.
The standard provides methods to derive strength, stiffness and density properties for structural timber from tests with defect-free specimen.
The values determined in accordance with this standard for mechanical properties and density are suitable for assigning grades and species to the strength classes of EN 338.
NOTE 1 For assigning grades and species to the strength classes in EN 338 only three properties, i.e. bending or tension strength, modulus of elasticity parallel to grain in bending or tension and density need to be determined from test data, other properties can be calculated according to Table 2.
NOTE 2 EN 1912 gives examples of established visual grades assigned to strength classes.