| 摘要: |
| 以截面尺寸为40mm×65mm，40mm×90mm和40mm×140mm国产兴安落叶松结构用规格材为研究对象，参照GB 50005—2003《木结构设计规范》的目测分等规则，将其分为Ⅰc，Ⅱc，Ⅲc和Ⅳc这4个等级.根据ASTM D4761 02a对其进行抗弯弹性模量、抗弯强度、顺纹抗拉强度和顺纹抗压强度测试.参照ASTM D2915 03，利用非参数法估计得到国产兴安落叶松结构用规格材的不同强度特征值，结果表明，其强度特征值高于进口云杉松冷杉（S P F）结构用规格材.通过足尺测试获得结构用规格材强度特征值，改变了GB 50005—2003现有强度特征值由无疵小试样推导而得的历史，同时为获得其他国内树种结构用规格材强度特征值提供了科学方法. |
| 关键词: 兴安落叶松 规格材 非参数法 强度特征值 |
| DOI：10.3969/j.issn.1007 9629.2012.03.013 |
| 分类号: |
| 基金项目:林业公益性行业科研专项经费(200904016)；中央级公益性科研业务费专项资金项目(CAFINT2009K04)；“十一五”国家科技支撑计划项目(2006BAD18B07) |
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| Study on Characteristic Values for Strength Properties of Chinese Larch Dimension Lumber |
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JIANG Jing hui, L Jian xiong, REN Hai qing
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Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China
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| Abstract: |
| Dimension lumber (cross sections are 40mm×65mm, 40mm×90mm and 40mm ×140mm, length is 4000mm) of Chinese larch(Larix gmelini) was visually graded intoⅠc, Ⅱc, Ⅲc and Ⅳc according to GB 50005—2003 standard, and was tested according to ASTM D4761 02a. The characteristic values of modulus of elasticity(MOE), modulus of rupture(MOR), ultimate tensile strength(UTS) and ultimate compressive strength(UCS) were estimated using nonparametric statistical analyses according to ASTM D2915 03. The characteristic strength value of Chinese larch is larger than that of Spruce Pine Fir(S P F) dimension lumber. The characteristic strength value was obtained and deduced from small sample of clear wood in GB 50005—2003, so that the situation was changed. The scientific method for estimating the characteristic strength of dimension lumber can be used to dimension lumber of other species in China. |
| Key words: Chinese larch(Larix gmelini) dimension lumber nonparametric statistical analysis strength characteristic value |
