落叶松目测等级规格材顺纹抗压强度尺寸效应  

Effect of Size on Ultimate Compression Strength Parallel to Grain of Visually-Graded Chinese Larch Dimension Lumber

作　　者：周海宾[1] 骆秀琴[1] 赵秀 王学顺[3] 

机构地区：[1]中国林业科学研究院木材工业研究所,北京100091 [2]黑龙江木材科学研究所,黑龙江哈尔滨150081 [3]北京林业大学理学院,北京100083

出　　处：《建筑材料学报》2012年第3期435-438,共4页Journal of Building Materials

基　　金：林业公益性行业专项(200904016)

摘　　要：以落叶松规格材为试验对象,研究了不同目测等级下该规格材截面宽度与其顺纹抗压强度之间的依存性.试验选取1 630根目测等级规格材,分成高、低目测等级组.测试6.5,9.0,14.0cm三个宽度试件的顺纹抗压强度,并利用斜率法和形状参数法求得高、低目测等级组顺纹抗压强度5%分位值的宽度尺寸效应系数.结果表明:用斜率法获得高、低目测等级组试件顺纹抗压强度5%分位值的宽度尺寸效应系数分别为0.11,0.20;该宽度尺寸效应系数可以应用于落叶松规格材强度的宽度尺寸调整;对于低目测等级组试件,用形状参数法估计的参数与用斜率法求得的宽度尺寸效应系数的倒数近似.Size effect is one of important factors to adjust tensile strength of dimension lumber to an desira-ble property. The dependence of the ultimate compression strength on the width of Chinese larch visually-graded dimension lumber was investigated. 1 630 dimension lumbers were parted into two groups of high visual grades and low visual grades; three lumBer widths（6.5 cm, 9.0 cm and 14.0 cm） were selected and ultimate compression strength property was tested. The width effects of the 5th percentile of ultimate compression strength were estimated by the slope method and the parametric method. Using nonparamet-ric estimates, the estimated width effect parameters of high-grade（H） and low-grade（L） were 0.11 and 0.20 for the 5th percentile. The parameters of L were larger than those for H. The width effect could be used when using the dimension lumber for practice purposes. When two-parameter Weibull di functions were fitted to the strength data, the estimated shape parameters of the Weibull distri the parametric method were almost identifical to the inverse of nonparametric parameters for the stribution bution by L grade.

关 键 词：落叶松 目测等级 规格材 顺纹抗压强度 尺寸效应 

分 类 号：TU531.1[建筑科学—建筑技术科学]