桉木制单板层积材的抗压强度预测模型.pdf

第17卷第2期
建筑材料学报
Vol. 17, No. 2
2014年4月
JOURNAL OF BUILDING MATERIALS
Apr.,2014
文章编号:1007-9629(2014)02-0355-06
桉木制单板层积材的抗压强度预测模型
钟永,邢新婷,任海青
(中国林业科学研究院木材工业研究所,北京10091)
摘要:为了研究桉木制单板层积材的抗压强度预测模型,进行了342个试件的抗压试验,分析了试
件纹理角度、胶层角度对其抗压强度、弹性模量和破坏模式的影响.采用指数模型拟合试件抗压强
度,并通过卡方(x)检验来验证该指数模型和 Hankinson公式、 Norris公式以及GB50005-2003
规范公式对抗压强度的拟合度,结果表明:随着试件纹理角度、胶层角度的增加,其抗压强度和弹
性模量均显著下降;抗压试件的破坏模式有3种,为纤维褶皱破坏、剪切破坏和压溃破坏;指教模
型、 Hankinson公式和 Norris公式均能较好地拟合抗压强度,而GB50005-2003规范公式拟合的
抗压强度值偏高.
关键词:单板层积材;抗压强度;预测模型;破坏模式;卡方检验
中图分类号:TS653.3
文献标志码:A
doi:10.3969/j.issn.1007-9629.2014.02.032
Predicting Model for Compressive Strength of
Eucalyptus Laminated Veneer Lumber
ZHONG Yong, XING Xinting, REN Haiqing
(Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China)
Abstract: A total of 342 specimens of eucalyptus laminated veneer lumber were tested in static compression
to study the predicting model for compressive strength. The effects of an angle to grain and an angle to
glue line were also investigated. The compressive strengths of specimens were fitted by exponential model
Hankinson formula, Norris formula and GB 50005-2003 formula, and the fitting degree of 4 used models
was compared by chi-square test. The results indicate that both compressive strength and elastic modulus
significantly decrease with the increase of an angle to grain or an angle to glue line. Three kinds of failure
modes with compressive test are wood fiber fold, shear failure and crushing failure. Exponential model
Hankinson formula and Norris formula fit the measured compressive strength better. On the contrary, the
compressive strength measured is far less than that fitted by GB 50005-2003 formula
Key words: laminated veneer lumber; compressive strength; predicting model; failure model; chi-square test
单板层积材又称旋切板胶合木,由2.5~4.5mm是其在建筑结构设计中得以应用的关键
厚单板多层平行施胶叠铺,再加温加压而成.单板层
为了探究木材的强度预测模型,Hil1于1948年
积材用作大型公共建筑、体育场馆的梁、柱等承重构将各向同性材料常用的 Mises屈服准则推广到各向
件时,因受单板所含斜纹、木节等缺陷的影响,受力情异性材料木材,但未考虑到木材拉、压强度的不同
况非常复杂.因此,建立单板层积材的强度预测模型,TRai和Wu2于1971年提出了Tsai-Wu强度准则,该
收稿日期:2012-11-07;修订日期:2012-12-17
基金项目:“十二五”国家科技支撑计划项目(2014BA1L.03B02,2012BAD23B01)
第一作者:钟永(1985-),男,湖北荆州人,中国林业科学研究院助理研究员,硕士.主要研究结构用木质材料性能评价.E-mail
ngong108c163、com
通信作者:邢新婷(1971-),女,河北城人,中国林业科学研究院副研究员,博士.E-mail:xingxinting(@,caf.ac.cn