摘要
对596根横截面尺寸为45mm×90mm的杉木人工林3种规格材(目测等级SS,No.1,No.2)抗弯、抗拉、抗压力学性质进行测试。结果表明:3个等级的弹性模量(MOE)、抗弯强度(MOR)、抗拉强度(UTS)及抗压强度(UCS)平均值从SS等级到No.2等级的变化呈"V"形,No.1等级的各项力学指标平均值略低于No.2等级;5%分位值(除MOE值外)从SS等级到No.2等级都呈下降趋势;不同目测等级的MOR,UTS,UCS值在0.01水平差异极显著,弹性模量与强度及各强度之间都存在较好的相关性。此外,当试件数量较少时,选择相同弹性模量范围内的强度平均值能较好地反映人工林杉木规格材弯曲强度、拉伸强度及压缩强度间的定量关系。
The bending, tensile and compression properties of 596 pieces of Chinese Fir dimension lumbers with 45 mm×90 mm cross section on three visual grades, SS, No.1 and No.2, were investigated in this paper. The results showed： the mean values of modulus of elasticity （MOE）, modulus of rupture （MOR）, ultimate tensile strength （UTS） and ultimate compression strength （UCS） were shaping like ＂V＂ from grade SS, No.1 to No.2, and those test values of lumbers on grade No.1 were all similar or slightly lower than that of on grade No.2. The 5th percentile value of those strength properties were observed to decrease from grade SS, No.1 to No.2, while there no significant change for MOE was observed among the visual grades. The values of MOR, UTS, and UCS had statistically significant differences on three grades at the 0.01 probability level. Moderately good correlation was observed between the mean values of MOE and the MOR, UTS, and UCS in the same MOE ranges, which can be quantified the relations of three main mechanical strengths when sample size was not big enough.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2011年第11期139-143,共5页
Scientia Silvae Sinicae
基金
公益性行业科研专项"结构用木材标准体系研究"(200904016)
关键词
人工林杉木
规格材
目测分等
足尺力学性质
Chinese Fir
dimension lumber
visual grading
full-size specimen’s mechanical properties
