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本文研究了东北红松、落叶松和黄花落叶松的木材密度和顺纹抗压强度的变异。供试验用的试材,是按照这些树种的分布,选择了各种有代表性的地区采集而来。试验数据采用方差分析方法,分别树种比较不同地区间的材性,以及在同一地区内的树株间和一株树内部木材性质的变异。研究结果清楚地表明了每种木材性质变异的特点。据此可以确定该种木材的密度和顺纹抗压强度的代表值,即树种平均值及标准差。本文并讨论了这三种木材用于木结构承重构件的应力分级方法,和木材设计应力不同表达方式及推导。
In this paper, the variations of wood density and compressive strength of the Korean pine, larch and yellow larch were studied. Specimens for testing are based on the distribution of these species, selected from a variety of representative areas collected. The test data were analyzed by analysis of variance (ANOVA). Species were used to compare the wood quality of different regions and the variation of wood properties within and between trees in the same area. The results clearly show the nature of each variation in wood properties. Based on this, we can determine the representative values of density and compressive strength of the wood species, namely the average and standard deviation of tree species. This paper also discusses the stress classification methods of these three kinds of timber used in load-bearing structure of wood structure, and different expressions of timber design stress and derivation.