木材的强度指标,是指小而无疵试样的强度,但通常木材具有不同种类和不同程度的缺陷,尤其是大型构件的结构材,必然包含某些缺陷。在建筑结构设计上确定木材的容许应力,木材缺陷是必须认真考虑的重要因素之一。因此,为合理地确定木材的容许应力及合理地使用木材,研究木材缺陷对木材强度的影响实属必要,而研究木材缺陷对 The strength index of wood refers to the strength of a small, non-defective specimen, but usually the wood has different kinds and degrees of defects, especially the structural material of a large component, which necessarily contains some defects. Determine the allowable stress of wood in the structural design of the building, timber defects is one of the important factors that must be seriously considered. Therefore, in order to rationally determine the allowable stress of timber and the rational use of wood, it is necessary to study the influence of wood defects on the strength of wood, and to study the effect of wood defects