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机械应力分级杉木锯材的顺纹抗拉强度
作者:
作者单位:

1.中国建筑西南设计研究院有限公司;2.中国林业科学研究院 木材工业研究所，北京 100091

作者简介:

龙卫国（1967—），男，江西吉水人，中国建筑西南设计研究院有限公司教授级高级工程师，硕士.E-mail：xnymjg@cscec.com

通讯作者:

钟 永（1985—），男，湖北荆州人，中国林业科学研究院副研究员，硕士生导师，博士.E-mail：zhongyong108@163.com

中图分类号:

TU366.2

基金项目:

“十三五”国家重点研发计划项目（2019YFD1101001）


Tensile Strength Parallel to Grain of Chinese Fir Lumber Graded by Mechanical Stress
Author:
Affiliation:

1.China Southwest Architectural Design and Research Institute Co.， Ltd.， Chengdu 610042， China;2.Research Institute of Wood Industry， Chinese Academy of Forestry， Beijing 100091， China

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    摘要:

    以杉木锯材为研究对象，对比了不同强度等级机械应力分级杉木锯材的动态弹性模量范围和试样数，探究了机械应力分级杉木锯材的顺纹抗拉强度概率分布规律，并开展了机械应力分级杉木锯材顺纹抗拉的可靠度分析.结果表明：可基于动态弹性模量对杉木锯材进行机械应力分级，机械应力分级杉木锯材位于主要强度等级材质区域Q2、Q3、Q4的试样数占比超90.0%，其顺纹抗拉强度的最优概率分布为对数正态分布；杉木锯材顺纹抗拉强度设计值明显高于未分级和目测分级杉木锯材.

    Abstract:

    Taking Chinese fir lumber as the research object， the dynamic elastic modulus range and the number of samples of mechanical stress graded lumber （MSGL） with different strength grades were compared， and the probability distribution and the reliability analysis for tensile strength parallel to grain of MSGL were explored. The results show that mechanical stress grading of Chinese fir lumber can be carried out based on dynamic elastic modulus. The number of samples of MSGL located in the main strength grade areas Q2， Q3 and Q4 exceeds 90.0%， and the optimal probability distribution for tensile strength for MSGL is the lognormal distribution. The design value of tensile strength for MSGL is significantly higher than that of ungraded and visual graded lumber.

    表 3 统计参数的名义值和变异系数Table 3 Nominal value and CV of statistic parameters
    表 2 杉木锯材顺纹抗拉强度的拟合结果Table 2 Characteristic values and fitting results of tensile strength parallel to grain of Chinese fir lumbers
    表 1 杉木锯材的顺纹抗拉强度试验统计结果Table 1 Test statistical results of tensile strength parallel to grain of Chinese fir lumbers
    图1 杉木锯材动态弹性模量的统计结果及机械应力分级Fig.1 Statistical results of E and MSGL of Chinese fir lumbers
    图2 杉木锯材顺纹抗拉强度的拟合结果Fig.2 Fitting results of tensile strength parallel to grain of Chinese fir lumbers
    参考文献
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    [2] 周海宾, 任海青, 吕建雄, 等. 分等方法对我国人工林杉木规格材等级的影响[J]. 建筑材料学报, 2009, 12(3):296-301.ZHOU Haibin, REN Haiqing, Jianxiong LÜ, et al. Effects of grading methods on dimension lumber grades for Chinese fir plantation[J]. Journal of Building Materials, 2009, 12(3):296-301. (in Chinese)
    [3] 任海青, 郭伟, 费本华, 等. 轻型木结构房屋用杉木规格材机械应力分等研究[J]. 建筑材料学报, 2010, 13(3):363-366.REN Haiqing, GUO Wei, FEI Benhua, et al. Mechanical stress grading of Chinese fir dimension lumber for light wood structure houses[J]. Journal of Building Materials, 2010, 13(3):363-366. (in Chinese)
    [4] 中华人民共和国住房和城乡建设部.木结构设计标准:GB 50005—2017[S]. 北京:中国建筑工业出版社, 2017.Ministry of Housing and Urban-Rural Development of the People’ s Republic of China. Standard for design of timber structures:GB 50005—2017[S]. Beijing:China Architecture and Building Press, 2017. (in Chinese)
    [5] Technical Committee CEN/FC 124. Timber structures-strength graded structural timber with rectangular cross section-part 1:General requirements:EN 14081-1[S]. Belgium: European Committee for Standardization, 2016.
    [6] Canadian Lumber Standards Accreditation Board Special products standard for machine graded lumber:SPS 2[S]. Vancouver: National Lumber Grades Authority, 2019.
    [7] 钟永, 武国芳, 任海青. 国产结构用规格材的抗弯强度可靠度分析和设计值[J]. 建筑结构学报, 2018, 39(12):119-127.ZHONG Yong, WU Guofang, REN Haiqing. Reliability analysis and design value on bending strength of domestic dimension lumber for structural purpose[J]. Journal of Building Structures, 2018, 39(12):119-127. (in Chinese)
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    [10] 钟永, 武国芳, 任海青, 等. 基于正态随机样本确定结构用木质材料强度标准值的方法[J]. 建筑结构学报, 2018, 39(11):129-138.ZHONG Yong, WU Guofang, REN Haiqing, et al. Determination method of characteristic strength for structural wood materials based on normal distribution and random sampling[J]. Journal of Building Structures, 2018, 39(11):129-138. (in Chinese)
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龙卫国,欧加加,陈迪,刘宜丰,钟永.机械应力分级杉木锯材的顺纹抗拉强度[J].建筑材料学报,2023,26(6):653-659

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  • 收稿日期:2022-07-09
  • 最后修改日期:2022-09-08
  • 在线发布日期: 2023-07-06
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